Engine Control Module Scan Tool Information. Cadillac SRX 2008

For 1990-2009 cars only

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Engine Control Module Scan Tool Information V6

Table 1:	Engine Control Module Scan Tool Data
Table 2:	Engine Control Module (ECM) Scan Tool Output Controls

The Engine Control Module Scan Tool Data List contains all engine-related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.

Use the Engine Scan Tool Data List only after the following is determined:

•	The Diagnostic System Check - Vehicle is completed.

•	No diagnostic trouble codes (DTCs)

•	On-board diagnostics are functioning properly

The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.

Note: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referenced in this service manual for use in diagnosis.

Engine Control Module Scan Tool Data

Parameter

System State

Expected Value

Description

Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop

5-volt Reference 1, 2, or 3 Circuit Status

This parameter will display OK if the circuit is good or Fault if a short to ground, short to B+ or open circuit is present.

A/C Disengage 1-8 History

A/C ON

Reason for A/C Disengagement

The parameter displays reason for the last 8 air conditioning (A/C) compressor disengagements in order from 1 to 8 with 8 being the most recent. There are 8 possible causes for the A/C compressor to disengage.

A/C High Side Pressure

A/C OFF

0.75-1.5 Volts*

This parameter displays the voltage signal from the A/C high side pressure sensor input to the control module.

* Varies with temperature, humidity, and altitude.

A/C ON

1.3-2.5 Volts*

A/C High Side Pressure

A/C OFF

450-827 kPa (65-120 psi)*

This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module.

* Varies with temperature, humidity, and altitude.

A/C ON

827-2,350 kPa (120-341 psi)*

A/C Off for WOT

A/C ON

This parameter displays whether the control module is commanding the A/C compressor clutch relay off for wide open throttle (WOT).

A/C Pressure Disable

A/C ON

This parameter displays whether the A/C pressure is out of range for normal operation as determined by the control module.

A/C Relay Ckt Short Gnd Test Status

A/C ON or OFF

OK/Not Run

This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is shorted to ground.

A/C Relay Ckt Open Test Status

A/C ON or OFF

OK/Not Run

A/C Relay Ckt Short Volts Test Status

A/C ON or OFF

OK/Not Run

A/C Relay Command

A/C ON

This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module.

A/C Request Signal

A/C ON

Yes

This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls.

Actual Fuel Rail Pressure (If Equipped)

3.4-5.5 mPa (500-800 psi)

This parameter displays the Actual Fuel Rail Pressure in a range from 0 to 2900 psi.

Air Flow Calculated

g/s Varies

This parameter displays the air flow into the engine as calculated by the control module.

Ambient Air Temperature

°C °F Varies

This parameter displays the outside air temperature as calculated by the control module.

APP Indicated Angle

Accelerator pedal not actuated

This parameter displays the angle of the accelerator pedal position (APP) as calculated by the control module using the signals from the APP sensors.

Accelerator pedal fully actuated

100%

APP Sensor 1

Accelerator pedal not actuated

0.7-1.2 Volts

This parameter displays the actual voltage on the accelerator pedal position (APP) sensor 1 signal circuit as measured by the control module.

Accelerator pedal fully actuated

4.2-4.5 Volts

APP Sensor 2

Accelerator pedal not actuated

0.3-0.5 Volts

This parameter displays the actual voltage on the accelerator pedal position (APP) sensor 2 signal circuit as measured by the control module.

Accelerator pedal fully actuated

2.2-2.5 Volts

APP Sensor 1 and 2

Agree

This parameter displays Disagree if the control module detects the signal voltage from APP sensor 1 is not in correct relationship to APP sensor 2. The scan tool displays Agree under the normal operating conditions.

Aux. Coolant Pump Relay (If equipped)

On/Off

This parameter displays the state of the Auxiliary coolant pump relay control circuit.

Aux. Coolant Pump Relay Ckt Short Gnd Test Status (If equipped)

OK/Not Run

This parameter displays the state of the Auxiliary coolant pump relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the Auxiliary coolant pump relay control circuit is shorted to ground.

Aux. Coolant Pump Relay Ckt Open Test Status (If equipped)

OK/Not Run

Aux. Coolant Pump Relay Ckt Short Volts Test Status (If equipped)

OK/Not Run

Aux. Vac. Pump Relay Command (If equipped)

On/Off

This parameter displays the state of the Auxiliary Vacuum pump relay control circuit.

Aux. Vac Pump Relay Ckt Short Gnd Test Status (If equipped)

OK/Not Run

This parameter displays the state of the Auxiliary Vacuum pump relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the Auxiliary coolant pump relay control circuit is shorted to ground.

Aux. Vac Pump Relay Ckt Open Test Status (If equipped)

OK/Not Run

Aux. Vac Pump Relay Ckt Short Volts Test Status (If equipped)

OK/Not Run

Average Injector PWM

1 Ms

This parameter displays the average ON time of all the Injectors.

BARO

65-104 kPa (8-16 psi)

This parameter displays the barometric pressure. The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences.

BARO

2.5-4.0 Volts

This parameter displays the barometric pressure sensor voltage.

Brake Pedal Signal Status

Valid/Invalid

This parameter displays the serial data message of the brake signal from the electronic brake and traction control module (EBTCM).

Calculated ECT - Closed Loop Fuel Control

-39 to +60°C (-38 to +140°F)

This parameter displays the modeled temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined amount of time, a DTC will set.

Calculated ECT - Thermostat Diagnosis

40 to +95°C (104 to +203°F)

This parameter displays the modeled temperature that the control module calculates from the intake air temperature, the engine coolant temperature, and ambient air temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined amount of time, a DTC will set.

Calc. TWC Temp. Bank 1 and 2

C° F°

Varies

This parameter displays the catalytic converter temperature as calculated by the control module.

Catalytic Converter Protection Active

This parameter displays if the control module is commanding catalytic converter protection.

Catalyst Monitor Complete This Ignition

Yes

This parameter displays the monitor completion status during the current driving/monitoring cycle.

Catalyst Monitor Enabled this Ignition

Yes

This parameter displays the monitor enable status during the current driving/monitoring cycle.

CKP Active Counter

0-255 Counts

This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position sensor (CKP).

CKP Resync Counter

0 Counts

This parameter displays the number of times the control module has to resynchronize with the CKP sensor. The parameter will begin to increment if the control module does not detect a CKP reference pulse. The parameter will reset to 0 after the ignition is switched OFF.

Clutch Start Switch (If Equipped)

Clutch pedal not actuated

Off

This parameter displays the state of the clutch pedal as determined by the control module from the clutch start switch.

Clutch pedal fully actuated

CMP Sensor

0 RPM

This parameter displays the speed of the engine as calculated by the signal from a camshaft position (CMP) sensor. This parameter will always display 0 unless a condition with the CKP sensor or CKP reluctor exists. If a CKP condition exists the control module will use a valid CMP sensor signal to determine engine speed and crank/camshaft position.

Cold Startup

Yes/No

This parameter displays whether the engine meets the conditions for a cold startup during the present ignition cycle. The scan tool displays Yes when the conditions for a cold startup are met during the ignition cycle. The scan tool displays No when the conditions for a cold startup are not met during the present ignition cycle. Conditions for a cold startup require the coolant temperature and the intake air temperature to be below a predetermined temperature and within a certain range of each other. These conditions must occur after the engine was warmed up to a specific temperature during the previous ignition cycle.

Commanded A/F Equivalence Ratio

Varies

This parameter displays the ratio of air to fuel as calculated by the control module based on various sensor inputs. The scan tool will display a lower air fuel ratio when a richer air to fuel mixture is commanded. The scan tool will display a higher air fuel ratio when a leaner air to fuel mixture is commanded. In closed loop operation the air fuel ratio should normally be approximately 14.7 to 1.

Component Monitor Enable This Ignition

Yes

This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.

Control Module Voltage

14.25 volts

This parameter displays the state of the ignition system voltage available at the control module.

CPP Switch (If Equipped)

Clutch pedal not actuated

Released

This parameter displays the state of the clutch pedal as determined by the control module from the clutch pedal switch.

Clutch pedal fully actuated

Applied

Crank Request Signal

Ignition switch not in the crank position

This parameter displays whether the ignition switch has been cycled to the crank position requesting the control module to activate the starter relay.

Ignition switch in the crank position

Yes

Cruise Control Active

This parameter displays the status of the cruise control system as determined by the control module.

Cruise Disengage 1-8 History

Cruise ON

Reason for Cruise Disengagement

The parameter displays the last 8 cruise control disengages in order from 1 to 8, with 8 being the most recent. There are approximately 30 possible causes for the cruise control to disengage

Cruise Inhibited

Cruise ON

Yes

The parameter displays Yes until all of the conditions required to activate the cruise control system are met.

Cruise Inhibit Reason

Cruise OFF

OFF

The parameter displays the reason the cruise control system cannot engage.

Cruise ON

Park/Neutral

Cruise On/Off Switch

On/Off

The engine control module (ECM) monitors the signal circuit of the cruise control switch. A closed switch is displayed as On.

Cruise Resume/Accel. Switch

Active/Inactive

The scan tool displays On, when the cruise On/Off switch is ON and the resume/accel (+) button is pressed, the ECM detects a predetermined voltage value for the resume/accel. switch.

Cruise Set/Coast Switch

Active/Inactive

The scan tool displays On, when the cruise on/off switch is ON and the ECM detects a predetermined voltage value for the set/coast (-) switch.

Current Gear

Transmission in Park/Neutral

P/N

This parameter displays the transmission gear commanded by the transmission control module.

Transmission not in Park/Neutral

Reverse/1st-5th

Cycles of Misfire Data

0-3,000 counts

This parameter displays the number of cylinder firing events recorded by the control module.

Cyl. 1-6 IC Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is shorted to ground.

Cyl. 1-6 IC Ckt Open Test Status

OK/Not Run

This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is open.

Cyl. 1-6 IC Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is shorted to voltage.

Cyl. 1-6 Inj. Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is shorted to ground.

Cyl. 1-6 Inj. Ckt Open Test Status

OK/Not Run

This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is open.

Cyl. 1-6 Inj. Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is shorted to voltage.

Cyl. 1-6 Knock Retard

0 Degrees

This parameter displays the knock retard as commanded by the control module for cylinders 1-6. Each cylinder is controlled individually based on both knock sensor signal inputs.

Decel. Fuel Cutoff

Inactive

This parameter displays the status of the operating mode of the control module used to turn off the fuel injectors and the EVAP canister purge valve during certain deceleration conditions.

Desired Exh. CMP Bank 1 or 2

Engine Idling

0 Degrees

This parameter displays the desired exhaust camshaft angle as commanded by the control module.

Engine speed at 2000 RPM

10 Degrees

Desired Fuel Rail Pressure (If Equipped)

Varies 3.4 mPa to 5.5 mPa ( 500 to 800 psi)

This parameter displays the desired Fuel Rail Pressure commanded by the control module.

Desired Idle Speed

Approximately 650 RPM

This parameter displays the desired engine idle speed as commanded by the control module. The desired idle speed varies depending on engine load.

Desired Int. CMP Bank 1 or 2

Engine Idling

0 Degrees

This parameter displays the desired intake camshaft angle as commanded by the control module.

Engine speed at 2000 RPM

10 Degrees

Distance Since DTC Cleared

0 Km/mi

This parameter displays in kilometers or miles the distance traveled since a DTC was cleared.

DTC Set This Ignition

This parameter displays Yes if a DTC set on the current ignition cycle.

EC Ignition Relay Command

This parameter displays the state of the control circuit for control module power relay as commanded by the control module.

EC Ignition Relay Feedback Signal

12.0-14.9 Volts

This parameter displays the voltage available at the EC ignition relay pin of the control module.

ECM in VTD Fail Enable

This parameter indicates whether or not the engine control module (ECM) is in failure enable mode for the vehicle theft deterrent (VTD) system.

ECT Sensor

88 to 105°C (190 to 221°F)

This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor.

Engine Load

Engine Idling

25-45%

This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors.

Engine speed at 2,500 RPM

40-60%

Engine OFF EVAP Test Conditions Met

This parameter displays Yes if the conditions for running the Engine Off EVAP diagnostic are met.

Engine Off Time

Engine OFF

0:00:00 Seconds - Varies

This parameter displays the amount of time that has elapsed since the engine was last cycled OFF.

Engine Oil Level Switch

This parameter displays if the level of the engine oil is within range as determined by the control module from information received from the engine oil level switch.

Engine Oil Life Remaining

0-100%

This parameter displays the percent of engine oil life remaining. The controller calculates the engine oil life by monitoring engine load, coolant temperature, and engine speed.

Engine Oil Pressure Sensor (If Equipped)

103 kPa (15 psi) to 241 kPa (35 psi)

This parameter displays the engine oil pressure.

Engine Oil Temperature Calculated

Varies

The parameter displays the temperature of the engine oil as calculated by the control module using various sensor inputs.

Engine Run Time

Engine Operating

0:00:00

Increments when the engine is operating

This parameter displays the time elapsed since the engine was started.

Engine Speed

Engine Cranking

Greater than 60 RPM

This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position (CKP) sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors.

Engine Idling

550-700 RPM

EVAP Fault History

No Fault

This parameter displays the result of the evaporative emission (EVAP) system as determined by the control module. The scan tool will display the following:

•

No Fault

•	Excess Vacuum

•	Purge Valve Leak

•	Small Leak

•	Weak Vacuum

•	No Test Result

EVAP Monitor Complete This Ignition

Yes/No

This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.

EVAP Monitor Enabled This Ignition

Yes/No

This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.

EVAP Purge Sol Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is shorted to ground.

EVAP Purge Sol Ckt Open Test Status

OK/Not Run

This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is open.

EVAP Purge Sol Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is shorted to voltage.

EVAP Purge Solenoid Command

0-100%

This parameter displays the on-time or duty cycle of the EVAP canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge.

EVAP Vent Sol Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the EVAP vent solenoid control circuit. The parameter displays Fault if the EVAP vent solenoid control circuit is shorted to ground. This parameter may not change if the scan tool is used to command the EVAP vent solenoid ON.

EVAP Vent Sol Ckt Open Test Status

OK/Not Run

This parameter displays the state of the EVAP vent solenoid control circuit. The parameter displays Fault if the EVAP vent solenoid control circuit is open. This parameter may not change if the scan tool is used to command the EVAP vent solenoid ON.

EVAP Vent Sol Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the EVAP vent solenoid control circuit. The parameter displays Fault if the EVAP vent solenoid control circuit is shorted to voltage. This parameter may not change if the scan tool is used to command the EVAP vent solenoid ON.

EVAP Vent Solenoid Command

Venting

This parameter displays the state of the control circuit for evaporative emission (EVAP) vent solenoid as commanded by the control module.

Exh. CMP Angle Bank 1 or 2

Engine Idling

0 Degrees

This parameter displays the actual exhaust camshaft position in degrees.

Engine speed at 2000 RPM

10 Degrees

Exh. CMP Angle Bank 1 or 2 Variance

Engine Idling

0 Degrees

This parameter displays in degrees, the difference between the desired exhaust camshaft position and the actual exhaust camshaft position.

Engine speed at 2000 RPM

0 Degrees

Exh. CMP Bank 1 or 2 Active Counter

0-255

This parameter displays an incrementing counter when the control module receives a signal from the exhaust camshaft position (CMP) sensor.

Exh. CMP Bank 1 or 2 Command

Engine Idling

20%

This parameter displays the on-time or duty cycle of the exhaust camshaft position (CMP) actuator solenoid valve as commanded by the control module.

Engine speed at 2000 RPM

50%

Exh CMP Sol Bn 1 or 2 Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to ground.

Exh CMP Sol Bn 1 or 2 Ckt Open Test Status

OK/Not Run

This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is open.

Exh CMP Sol Bn 1 Ckt or 2 Short Volts Test Status

OK/Not Run

This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to voltage.

Extended Travel Brake Pedal Switch

Released

This parameter will display the state of the brake pedal, applied or released.

FC Relay 1 Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to ground.

FC Relay 1 Ckt Open Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open.

FC Relay 1 Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to voltage.

FC Relays 2 and 3 Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to ground.

FC Relays 2 and 3 Ckt Open Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open.

FC Relays 2 and 3 Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to voltage.

FC Relay 1 Command

Varies

This parameter displays the commanded state of the fan relay 1 control circuit. The cooling fan relay 1 should be ON when the scan tool indicates the FC Relay 1 Command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the FC Relay 1` Command is OFF.

FC Relay 2 and 3 Command

Varies

This parameter displays the commanded state of the fan relay 2 and 3 control circuit. Cooling fan relays 2 and 3 should be ON when the scan tool indicates the FC Relay 2 and 3 Command is ON. Cooling fan relays 2 and 3 should be OFF when the scan tool indicates the FC Relay 2 and 3` Command is OFF.

Fuel Level Sensor

0-5 Volts

This parameter displays the voltage signal received by the control module from the fuel level sensor.

Fuel Level Sensor Left Tank (If Equipped)

0-5 Volts

This parameter displays the voltage signal received by the control module from the secondary fuel level sensor in the left side of the fuel tank.

Fuel Level Sensor Right Tank (If Equipped)

0-5 Volts

This parameter displays the voltage signal received by the control module from the primary fuel level sensor in the right side of the fuel tank.

Fuel Pump Relay Command

Ignition ON, engine OFF

Fuel pump on for 2 seconds

This parameter displays the control modules commanded state of the fuel pump relay control circuit. Or, the commanded state of the enable circuit for the fuel pump control module (FPCM), if equipped.

Engine idling

FRP Regulator Command (If Equipped)

130 to 135 Degrees

The scan tool displays in degrees, the FRP Regulator ON time as commanded by the control module.

Fuel Rail Pressure Sensor (If Equipped)

0 to 5 volts

This parameter displays the voltage signal received by the control module from the fuel rail pressure (FRP) sensor.

Fuel Tank Level Remaining

Liter/Gallon - Varies

This parameter displays the amount of fuel in liters/gallons that remains in the fuel tank as determined by the control module.

Fuel Tank Level Remaining

0-100%

This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module.

Fuel Tank Pressure Sensor

Ignition ON, engine OFF

0 in H2O/mm Hg

This parameter displays the pressure/vacuum inside the fuel tank. A negative value indicates a vacuum, while a positive value indicates a pressure.

Fuel Tank Pressure Sensor

Ignition ON, engine OFF

0-5 Volts

This parameter displays the voltage signal received by the control module from the fuel tank pressure (FTP) sensor.

Fuel Tank Rated Capacity

Varies

This parameter displays the capacity of the fuel tank in liters or gallons. The rated capacity displayed by the scan tool will varies with vehicle type.

Fuel Trim Learn

Disabled

This parameter displays Enabled when conditions are appropriate for enabling long term fuel trim corrections. This indicates that the long term fuel trim is adapting continuing amounts of short term fuel trim. If the scan tool displays Disabled, then long term fuel trim will not respond to changes in short term fuel trim.

Fuel Volatility

Varies

This parameter indicates the rate the fuel can be vaporized in the cylinder as calculated by the control module. The scan tool will display HIGH when the fuel volatility is high. The scan tool will display LOW when the fuel volatility is low.

GEN L-Terminal Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the generator L circuit terminal. The parameter displays Fault if the generator L circuit is shorted to ground.

GEN L-Terminal Ckt Open Test Status

OK/Not Run

This parameter displays the state of the generator L circuit terminal. The parameter displays Fault if the generator L circuit is open.

GEN L-Terminal Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the generator L circuit terminal. The parameter displays Fault if the generator L circuit is shorted to voltage.

GEN L-Terminal Signal Command

0-100%

This parameter displays the control modules commanded state of the voltage regulator on the generator.

Generator F-Terminal Signal

0-100%

This parameter displays the amount of generator on-time as commanded by the control module. The higher the percentage the greater the generator output.

HO2S Bank 1 or 2 Sensor 1

50-900 mV - Varies

This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust.

HO2S Bank 1 or 2 Sensor 2

400-700 mV - Varies

This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust.

HO2S Bn 1 or 2 Sen 1 or 2 Htr Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to ground.

HO2S Bn 1 or 2 Sen 1 or 2 Htr Ckt Open Test Status

OK/Not Run

This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is open.

HO2S Bn 1 or 2 Sen 1 or 2 Htr Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to voltage.

HO2S Bank 1 or 2 Sensor 1 or 2 Heater Command

0-100%

This parameter displays the HO2S heater ON time in percentage, as commanded by the control module.

HO2S Bank 1 or 2 Sensor 1 or 2 Heater Command

ON/OFF

This parameter display the state of the HO2S heater control circuit as commanded by the control module.

HO2S/O2S Monitor Complete This Ignition

Yes/No

This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.

HO2S/O2S Monitor Enabled This Ignition

Yes/No

This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.

HO2S Sensing Element Bn. 1 or 2 Sensor 1

70-90 Ohms

Depends on Temperature

This parameter displays the resistance of the sensing element within the control module.

HO2S Sensing Element Bn. 1 or 2 Sensor 2

20-300 Ohms

Depends on Temperature

This parameter displays the resistance of the sensing element within the control module.

HO2S Bn. 1 or 2 Sensor 1 Module Signal

1-5 Volts

This parameter displays the voltage of the HO2S control transistor, which is internal to the ECM.

IAT Sensor

-39° to +140°C

(-38° to +284°F)

This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor.

Ignition Accessory Signal

This parameter displays On when the control module detects a voltage at the ignition accessory input terminal.

Ignition 0 Signal

This parameter displays On when the control module detects a voltage at the ignition 0 input terminal.

Ignition 1 Signal

B+

This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal.

Ignition 1 Signal

This parameter displays On when the control module detects a voltage at the ignition 1 input terminal.

IMT (IMRC) Ckt Short Gnd Test Status (If equipped)

OK/Not Run

This parameter displays the state of the intake manifold tuning (IMT) valve solenoid control circuit. The parameter displays Fault if the IMT Valve solenoid control circuit is shorted to ground.

IMT (IMRC) Ckt Open Test Status (If equipped)

OK/Not Run

This parameter displays the state of the intake manifold tuning (IMT) valve solenoid control circuit. The parameter displays Fault if the IMT Valve solenoid control circuit is open.

IMT (IMRC) Ckt Short Volts Test Status (If equipped)

OK/Not Run

This parameter displays the state of the intake manifold tuning (IMT) valve solenoid control circuit. The parameter displays Fault if the IMT Valve solenoid control circuit is shorted to voltage.

IMT (IMRC) Valve Solenoid Command (If equipped)

Off

This parameter displays the control modules commanded state of the IMT Valve solenoid.

Initial Brake Apply Signal

Brake pedal not actuated

Released

This parameter displays the state of the brake pedal that is transmitted over the serial data circuit from the electronic brake control module (EBCM).

Brake pedal partially actuated

Applied

Injector 1-6 Command

Engine idling

0.82-1.50 ms

This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module.

Injector 1-6 Disabled Due To Misfire

Engine idling

This parameter displays the status of the fuel injector driver by the control module. The scan tool will display YES if the fuel injector is being disabled due to a misfire detection. The scan tool will display NO if the fuel injector is not being disabled by the control module due to a misfire.

Int. CMP Angle Bank 1 or 2

Engine Idling

0 Degrees

This parameter displays the actual intake camshaft position in degrees.

Engine speed at 2000 RPM

10 Degrees

Int. CMP Angle Bank 1 or 2 Variance

Engine Idling

0 Degrees

This parameter displays in degrees, the difference between the desired intake camshaft position and the actual intake camshaft position.

Engine speed at 2000 RPM

0 Degrees

Int. CMP Bank 1 or 2 Active Counter

0-255

This parameter displays an incrementing counter when the control module receives a signal from the intake camshaft position (CMP) sensor.

Int. CMP Bank 1 or 2 Command

Engine Idling

20 %

This parameter displays the on-time or duty cycle of the intake camshaft position (CMP) actuator solenoid valve as commanded by the control module.

Engine speed at 2000 RPM

50 %

Int CMP Sol Bn 1 or 2 Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to ground.

Int CMP Sol Bn 1 or 2 Ckt Open Test Status

OK/Not Run

This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is open.

Int CMP Sol Bn 1 or 2 Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to voltage.

Knock Detected Cyl. 1-6

This parameter displays Yes if the control module detects an abnormal noise or detonation that is particular to an individual cylinder.

Knock Retard

0 Degrees

This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensors.

KS Reference Bn 1 or 2

3-5 Volts

This parameter displays in voltage, the normal noise/vibration, learned by the control module.

KS 1 or 2 Signal

3.86-5.02 Volts

This parameters displays the voltage input to the control module from the knock sensor (KS).

Loop Status Bn 1 or 2 Sen. 1

Closed Loop

This parameter displays the state of the fuel control system as commanded by the control module. Closed Loop operation indicates that the control module is controlling the fuel delivery based off the oxygen sensors input signal. In Open Loop operation the control module ignores the oxygen sensor input signal and bases the amount of fuel to be delivered on other sensor inputs.

Loop Status Bn 1 or 2 Sen. 2

Open Loop

This parameter displays the state of the rear heated oxygen sensors as commanded by the control module. The rear sensors will not go into Closed Loop until the ECM determines that the HO2S is ready for operation.

Low EOP Indicator Command

Off

This parameter displays the commanded state of the low EOP lamp control circuit by the control module.

Long Term FT Bank 1 or 2

This parameter displays the commanded Long Term Fuel Trim correction by the control module for bank 1 or bank 2 for cruise and acceleration conditions.

LT FT Bn. 1 or Bn. 2 Idle/Decel

This parameter displays the commanded Long Term Fuel Trim correction by the control module for bank 1 or bank 2 for idle and deceleration conditions.

MAF Sensor

Engine Idling

3.0-8.3 g/s

This parameter displays in grams per second, the measured quantity of air flowing into the engine during all operating conditions.

Engine speed at 2,500 RPM

11.88 g/s

MAF Sensor

Engine Idling

2,000-2,500 Hz

The scan tool displays a range of 0-65,555 hertz. This parameter displays the frequency signal input to the control module, and represents measured quantity of air flowing into the engine during all operating conditions.

MIL Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is shorted to ground.

MIL Ckt Open Test Status

OK/Not Run

This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is open.

MIL Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is shorted to voltage.

MIL Command

Off

This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the control module.

Mil Requested by DTC

This parameter indicates the reason the control module illuminated the MIL. The scan tool will display YES when the MIL is requested as a result of an A or B type DTC. The scan tool will display NO if the MIL is illuminated for another reason, such as transmission DTCs.

Mileage Since DTC Cleared

km - miles

This parameter displays the mileage that has elapsed since any diagnostic trouble code (DTC) has been cleared from the control modules memory.

Mileage Since DTC First Failure

km - miles

This parameter displays the mileage that has elapsed since the first emission failure.

Mileage Since DTC Last Failure

km - miles

This parameter displays the mileage that has elapsed since the last emission failure.

Mileage Since MIL Requested

km - miles

This parameter displays the mileage that has elapsed since the control module has commanded the malfunction indicator lamp (MIL) On.

Misfire Current Cyl. 1-6

The scan tool displays a range of 0-255 counts. This parameter displays the number of misfires that have been detected during the last 255 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all of the cylinders, and in low numbers.

Misfire History Cyl. 1-6

The scan tool displays a range of 0-65,535 counts. The misfire history counters display the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will update every 255 cylinder firing events.

Moderate Brake Apply Signal

Brake pedal not actuated

Released

This parameter displays the state of the brake pedal that is transmitted over the serial data circuit from the electronic brake control module (EBCM).

Brake pedal fully actuated

Applied

PNP Switch

Transmission in Park/Neutral

Park/Neutral

This parameter displays whether the transmission range selector is in park/neutral or in gear.

Transmission not in Park/Neutral

In Gear

Post Inj. Cyl. 1-6 Command

0 ms

This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module for catalyst heating.

Power Enrichment

Inactive

This parameter displays the status of the operating mode of the control module used to increase fuel delivery during certain acceleration conditions.

Reduced Engine Power

Inactive

This parameter displays Active if the control module is commanding reduced engine power due to a throttle actuator control (TAC) system condition.

RVS Disable 1-8 History

Reason for RVS Disable

These parameters displays the last eight reasons the control module disabled remote vehicle start (RVS).

Short Term FT Bank 1 or Bank 2

-5% to +5%

This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor 1 or 2. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0.

Spark

2-10 Degrees

This parameter displays the amount of spark advance the control module is commanding on the ignition control circuits. The control module determines the desired advance.

Starter Relay Ckt Short Gnd Test Status

OK/Not Run

This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is shorted to ground.

This parameter may not change if the scan tool is used to command the relay control circuit ON.

Starter Relay Ckt Open Test Status

OK/Not Run

This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is open.

This parameter may not change if the scan tool is used to command the relay control circuit ON.

Starter Relay Ckt Short Volts Test Status

OK/Not Run

This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is shorted to voltage.

This parameter may not change if the scan tool is used to command the relay control circuit ON.

Starter Relay Command

Ignition switch not in the crank position

Off

This parameter indicates whether the control module is commanding the starter relay to go on or off.

Ignition switch in the crank position

Start Up ECT

-39° to +140°C (-38° to +284°F)

This parameter displays the temperature of the engine coolant on start up based on input to the control module from the ECT sensor.

Start Up IAT

-39° to +140°C (-38° to +284°F)

This parameter displays the temperature of the intake air at start in the air induction system based on input to the control module from the IAT sensor.

Stoplamp Pedal Switch

Brake pedal not actuated

Released

This parameter displays the position of the stop lamp pedal switch input to the control module.

Brake pedal fully actuated

Applied

System Power Mode

Run

This parameter displays the position of the ignition switch. The scan tool will display the following:

•

Accessory

•

Crank

•

Off/Awake

•

Run

TAC Forced Engine Shutdown

This parameter indicates the status of the TAC motor by the control module. The scan tool will display Yes if the engine has been shut down due to a throttle control fault.

TAC Motor

Enabled

This parameter indicates the status of the throttle actuator control (TAC) motor driver in the control module. The scan tool will display Enabled if TAC motor operation is allowed. The scan tool will display Disabled if the control module detects a condition that affects TAC motor operation.

TAC System Learned Counts

0-11

This parameter displays the steps counted in learning the throttle actuator control parameters. The last step learned is 11.

TCC Status

Unlocked

This parameter displays the commanded status of the torque convertor clutch.

TCM Requested Torque

N·m/lb ft

This parameter displays the calculated amount torque requested of the controller.

TCM Torque Increase

This parameter displays whether or not the controller has responded to a request for a torque increase.

TCS Torque Increase

This parameter displays whether or not the controller has responded to a request for a torque increase.

TCS Torque Reduction Active

This parameter displays whether the transmission control module (TCM) is reducing torque.

TCM Torque Reduction Active

This parameter displays whether EBTCM has determined a reduction in torque took place.

TCS Torque Delivered Signal

0-100%

This is the calculated torque output from the engine to the transmission used by the EBTCM for the traction control system operation.

TCS Torque Request Signal

0-100%

The EBTCM sends a Desired Torque Level signal request to the control module. This decreases torque from the powertrain in order to reduce wheel slip during acceleration for the traction control.

Total Fuel Trim Avg. Bank 1 or Bank 2

-100 to +100%

This parameter displays the overall fuel trim from the Long Term idle/decel parameter and the Long Term Fuel Trim cell.

Total Knock Retard

0°

This parameter displays how much ignition spark timing is being retarded due to all control systems monitored by the control module.

Total Misfire Count

This parameter displays the total number of cylinder firing events that the control module detected as misfires for the last 200 crankshaft revolution sample period.

TP Desired Angle

0-100%

This parameter displays the desired TP angle commanded by the control module.

TP Indicated Angle

0-100%

This parameter displays the percent of throttle opening as calculated by the control module using the inputs from TP sensors 1 and 2.

TP Sensor 1

3.7-4.3 Volts

This parameter displays the actual voltage on the TP sensor 1 signal circuit as measured by the control module.

TP Sensor 1 Learned Minimum

4.1-4.7 Volts

This parameter displays the learned minimum value of throttle position (TP) sensor 1 as recorded by the control module during the last learn procedure.

TP Sensor 2

0.7-1.1 Volts

This parameter displays the actual voltage on the TP sensor 2 signal circuit as measured by the control module.

TP Sensor 2 Learned Minimum

0.5-0.9 Volts

This parameter displays the learned minimum value of TP sensor 2 as recorded by the control module during the last learn procedure.

TP Sensors 1 and 2

Agree

This parameter displays Disagree when the control module detects that TP sensor 1 voltage signal is not within the correct relationship to TP sensor 2. The scan tool displays Agree under the normal operating conditions.

Traction Control Status

Inactive

This parameter displays Active if the electronic brake and traction control module (EBTCM) is commanding traction control.

Trans. Output Speed Signal

0 RPM

This parameter contains the Replicated Transmission Output Speed (Replicated TOS) received from the Transmission Control Module. Replicated TOS results from hardware in the TCM that re-transmits the Transmission Output Speed Sensor pulses to the ECM.

Vehicle Security Status

Fuel Continued

This parameter displays the status of the vehicle theft deterrent system.

Vehicle Speed Sensor

Km/h

mph

This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor (VSS).

Volumetric Efficiency

Engine Idling

5-25%

This parameter displays the calculated volumetric efficiency of the engine as calculated by the control module.

Engine speed at 2,500 RPM

5-25%

VTD Auto. Learn Timer

Inactive

This parameter indicates that either the auto learn timer (used in the auto learn procedure to enable VTD password learning) or the seed and key timer (used in the seed and key procedure to enable VTD password learning) is active.

VTD Fuel Disable

Inactive

This parameter indicates the VTD system has disabled fuel.

VTD Fuel Enabled

YES

This parameter indicates that the VTD system has enabled the fuel system.

VTD Fuel Disable Until Ign. Off

This parameter indicates the VTD system has disabled fuel for the remainder of the ignition cycle.

VTD Password learned

YES

This indicates learning of the VTD password received from the platform electronics is enabled. VTD password learning is first enabled in assembly plant (prior to the manufacturer’s enable counter being set to zero) may be re-enabled using 1 of 2 procedures.

Warm Ups Since DTC Cleared

Counts

This parameter indicates the number of warm up cycles that have occurred Since DTCs were cleared. The scan tool will display a higher counts as more warm up cycles have occurred since the DTCs were cleared.

Wide Open Throttle

This parameter displays the throttle status commanded by the control module. The scan tool will display YES if the vehicle throttle is commanded to 100 percent.

Engine Control Module (ECM) Scan Tool Output Controls

Output Control

Description

A/C Relay

The engine must be running and the ECM must receive an A/C request from the HVAC control module in order to enable the output control. The ECM de-energizes the A/C compressor clutch relay when OFF is selected. The relay remains de-energized until ON is selected.

Auxiliary Coolant Pump Relay (If Equipped)

This function controls the auxiliary coolant pump relay. The normal commanded state is NONE. When commanded ON/OFF, the control module turns the auxiliary coolant pump relay ON and OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Aux. Vac. Pump (If Equipped)

This function controls the brake booster auxiliary vacuum pump. The normal commanded state is NONE. When commanded ON/OFF, the control module turns the auxiliary vacuum pump ON and OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

CMP Actuator Intake/Exhaust Bank 1 or Bank 2

This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 40 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

•	The vehicle speed is 0 km/h (0 mph).

•	The transmission is in park or neutral.

•	The engine speed is between 1,000-1,400 RPM.

The system remains in the commanded state until cancelled by the scan tool.

CMP Sol. Intake/Exhaust Bank 1 or Bank 2

This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Cooling Fan Relay 1

This function activates the cooling fan relay 1. The normal commanded state of the fan relay is NONE. The relay command status can also be monitored on the scan tool data parameter FC Relay 1 Command. The control module allows cooling fan relay control when the following conditions are met:.

•	The ignition is ON or the engine is running

•	A/C compressor operation is not requested.

•	The engine coolant temperature is less than 106°C (224°F)

Cooling Fan Relay 2 & 3

This function activates the cooling fan relay 2 and relay 3. The normal commanded state of the fan relays is NONE. The relay command status can also be monitored on the scan tool data parameter FC Relay 2 and 3 Command. The control module allows cooling fan relay control when the following conditions are met:

•	The ignition is ON or the engine is running

•	A/C compressor operation is not requested.

•	The engine coolant temperature is less than 106°C (224°F).

Cooling Fan Relay 1, 2 & 3

This function activates the cooling fan relay 1, 2 and 3. The normal commanded state of the fan relays is NONE. The relay command status can also be monitored on the scan tool data parameters FC Relay 1 Command and FC Relay 2 and 3 Command. The control module allows cooling fan relay control when the following conditions are met:

•	The ignition is ON or the engine is running

•	A/C compressor operation is not requested.

•	The engine coolant temperature is less than 106°C (224°F).

Cylinder Power Balance

Note: The Misfire Current and Misfire History parameters may not increment when using this function.

This function disables the selected fuel injector. The normal commanded state is None. The scan tool initiates the test when the following conditions are met:

•	The engine is operating and the engine idle is stable.

•	The vehicle speed is 0 km/h (0 mph).

•	There are no DTCs set for the vehicle speed sensor.

If the fuel injector was disabled for 30 seconds, fuel injector control is not allowed again on the same fuel injector for 60 seconds.

Engine Speed Control

This function controls the idle speed override in 25 RPM, 100 RPM, and 500 RPM increments, from the base idle speed to 1,400 RPM. The scan tool initiates the test when the following conditions are met:

•	The transmission is in park or neutral.

•	The engine speed is less than 1,000 RPM.

The engine speed will remain in the commanded state until cancelled by the scan tool.

EVAP Purge Solenoid

Note: The EVAP Purge Solenoid Command parameter may not change states when using this output control.

This function controls the evaporative emission (EVAP) purge solenoid valve. The normal commanded state is NONE. The system will increase or decrease the amount of purge by changing the duty cycle of the purge valve in 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the scan tool or the fuel tank pressure (FTP) sensor exceeds -24 mm Hg (-12 inch H20).

EVAP Purge/Seal

Note: The EVAP Purge and Vent Solenoid Command parameters may not change states when using this output control.

This function activates both the EVAP purge solenoid valve and EVAP vent solenoid to seal the EVAP system. When activated, the purge valve is commanded to 0 percent and the vent valve is commanded ON, Not-venting. The normal commanded state for both solenoids is None. Both of the solenoids remain in the commanded state until cancelled by the scan tool or the FTP sensor exceeds -24 mm Hg (-12 inch H20).

EVAP Vent Solenoid

Note: The EVAP Vent Solenoid Command parameter may not change states when using this output control.

This function controls the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to Not-venting. The system remains in the commanded state unless one of the following conditions occur:

•	Cancelled by the scan tool

•	The EVAP canister purge solenoid is more than 0 percent, and the FTP sensor exceeds -24 mm Hg (-12 inch H20).

Fuel Injector Balance Test ( If Available)

This function enables the fuel injector in order to verify the correct fuel injector flow. The ECM will pulse the selected fuel injector when the following conditions are met:

•	All instruction on the scan tool is complete.

•	A fuel injector is selected.

•	The ignition is ON with the engine OFF.

The selected fuel injector can only be flowed/pulsed once per ignition cycle.

Fuel Pressure Control

This function allows control of the fuel rail pressure (FRP) regulator which is integral to the high pressure fuel pump. The system will Increase or Decrease the fuel rail pressure in increments, as commanded within an approximate range of 414-17,237 kPa (60-2500 psi). The scan tool initiates the test when the following conditions are met:

•	The engine is operating

•	The ignition voltage is 10-18 volts

•	The vehicle speed is 0 mph

•	DTC P0700 is not set

The system remains in the commanded state for about 30 seconds or until cancelled by the scan tool or the ECM detects a vehicle speed.

Fuel Pump Relay (If Equipped)

This function controls the fuel pump relay. The normal commanded state is NONE. The scan tool initiates the test when the following conditions are met:

•	There are no vehicle speed sensor DTCs set.

•	The vehicle speed is 0 km/h (0 mph).

When commanded ON/OFF, the engine control module (ECM) turns the fuel pump relay ON/OFF. If the engine is running and the fuel pump relay is commanded OFF, the engine will stall. The system remains in the commanded state for about 2 seconds or until cancelled by the scan tool or the ECM detects a vehicle speed.

Fuel Trim Enable

This function disables the control modules ability to learn new fuel trim parameters. The commanded states are NONE, ENABLED, DISABLED. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Reset

This function is used to reset the learned fuel trim values to their initial values.

Generator L-Terminal

Commands the generator L terminal On and Off.

Idle Learn Reset

This function allows the throttle position and the idle speed to be relearned by the ECM, once the following conditions have been met.

•	The ignition is ON with the engine OFF.

•	The ECT is between 5-85°C (41-185°F).

•	No throttle actuator control (TAC) system DTCs are set.

Idle Spark

Disables and enables idle spark advance with the engine running.

IMT (IMRC) Valve Solenoid (If Equipped)

This function controls the intake manifold tuning valve (IMT) valve solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the IMRC solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	There are no vehicle speed sensor DTCs set.

•	The vehicle speed is 0 km/h (0 mph).

The system remains in the commanded state until cancelled by the scan tool.

Loop Status

This function controls the heated oxygen sensor (HO2S) loop status. The commanded states include NONE, OPEN, and CLOSED. The normal commanded state is NONE. The loop status changes as commanded, OPEN or CLOSED.

The system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp

This function controls the malfunction indicator lamp (MIL). The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the MIL ON/OFF. The system remains in the commanded state until cancelled by the scan tool.

Oil Life Reset

This output control is used to reset the engine oil life monitor from 0 to 100%.

RVS Disable History Reset

This function clears the remote vehicle start (RVS) disable history. When RESET is selected the reason the control module did not allow RVS in the last 8 attempts is cleared.

Starter Relay (If Available)

Commands the starter relay ON and OFF.

Throttle Blade Control

This function controls the throttle valve in 10 percent increments. The scan tool initiates the test when the following conditions are met:

•	There are no vehicle speed sensor DTCs set.

•	The vehicle speed is 0 km/h (0 mph).

•	The ignition is ON, with the engine OFF.

•	The ECM is not commanding a throttle learn.

The system remains in the commanded state until cancelled by the scan tool.

Engine Control Module Scan Tool Information RPO L37, LC3, LD8, or LH2

Table 1:	Engine Control Module Scan Tool Data
Table 2:	Output Control

Use the Engine Scan Tool Data List only after the following is determined:

•	The Diagnostic System Check - Vehicle is completed.

•	No DTCs are set

•	The on-board diagnostics are functioning properly

The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The engine scan tool data list represents values that would be seen on a normally running engine.

Important: A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.

Only the parameters listed below are referenced in this service manual for use in diagnosis.

Engine Control Module Scan Tool Data

Parameter

System State

Expected Value

Description

Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop/Accessories OFF

5-volt Reference 1

5 Volts

This parameter displays the voltage sensed on the 5-volt reference 1 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage.

5-volt Reference 1 Circuit Status

This parameter will display OK if the circuit is good or Fault if a short to ground, short to B+ or open circuit is present.

5-volt Reference 2

5 Volts

This parameter displays the voltage sensed on the 5-volt reference 2 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage.

5-volt Reference 2 Circuit Status

This parameter will display OK if the circuit is good or Fault if a short to ground, short to B+ or open circuit is present.

A/C Request Signal

The scan tool displays YES/NO. The HVAC module receives an input request when the HVAC module is turned ON.

A/C Relay Command

OFF

This parameter displays the commanded state of the air conditioning (A/C) clutch relay control circuit. The scan tool will display ON or OFF. ON indicates the A/C clutch relay control circuit is being grounded by the control module, allowing voltage to the A/C compressor clutch. OFF indicates the A/C clutch relay is not being commanded ON by the control module.

A/C Relay Ckt Short Gnd Test Status

This displays the status of the relay control circuit. It can display OK, Fault or Not Run.

A/C Relay Ckt Open Test Status

This displays the status of the relay control circuit. It can display OK, Fault or Not Run.

A/C Relay Ckt Short Volts Test Status

Not Run

This displays the status of the relay control circuit. It can display OK, Fault or Not Run.

A/C High side Pressure Sensor

A/C OFF

1.43 Volts

The scan tool displays 0-5 volts. The voltage applied to the ECM input for the A/C refrigerant pressure sensor.

A/C ON

2.39 Volts

A/C High side Pressure Sensor

A/C OFF

500-2,220 kPa (72-319 psi)

The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the ECM input from the A/C refrigerant pressure sensor is converted to a pressure value.

A/C ON

300-1,220 kPa (43-174 psi)

A/C OFF for WOT

A/C ON

The scan tool displays YES/NO. The state of the A/C request related to wide open throttle.

A/C Pressure Disable

The scan tool displays YES/NO. The state of the A/C refrigerant pressure sensor and circuitry.

A/C Disengage 1-8 History

A/C ON

Reason for A/C Disengagement

The scan tool displays None, A/C Pressure, Engine Speed, Battery Voltage, Stall Prevention, RPM Unstable, WOT, Launch Performance or Coolant Hot. The scan tool displays None if OK.

Air Flow Calculated

3-7 g/s

This parameter displays the air flow of the engine as calculated by the control module using information from the manifold absolute pressure (MAP) sensor. The scan tool will display a range of values indicating a high air flow when MAP pressure is high and a low air flow when MAP pressure is low. This value is listed in grams per second (g/s).

AIR Indicated Pressure

AIR Pump OFF

0 kPa/psi

This parameter displays the secondary air injection (AIR) system pressure above barometric pressure as calculated based on a signal sent to the control module from the sensor used to monitor the pressure inside the AIR injection system. The scan tool will display a low value when the pressure in the AIR system pressure is low. The scan tool will display a high value when the pressure in the AIR system is high.

AIR Pressure Sensor

AIR Pump OFF

Near BARO

This parameter displays the actual AIR system pressure as calculated based on a signal sent to the control module from the sensor used to monitor the pressure inside the AIR injection system. The scan tool will display a low value when the pressure in the AIR system is low. The scan tool will display a high value when the pressure in the AIR system is high.

AIR Pressure Sensor

AIR Pump OFF

2.4-2.8 Volts

This parameter displays the voltage signal sent to the control module from the sensor used to monitor the pressure inside the AIR injection system. The scan tool will display a low voltage when the pressure in the AIR system is high. The scan tool will display a high voltage when the pressure in the AIR system is low.

AIR Pressure Sensor Variance

0 kPa/psi

This parameter displays the difference between the desired AIR pressure calculated by the control module and the actual AIR pressure. The scan tool will display a higher value if the difference is large, and a lower value if the difference is small.

AIR Pump Relay Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the AIR pump relay control circuit. The scan tool will display OK , Fault or Not Run. OK indicates that no circuit faults are detected during the current test.

AIR Pump Relay Ckt Open Test Status

AIR Pump Relay Ckt Short Volts Test Status

This parameter displays the status of the output driver for the AIR pump relay control circuit. The scan tool will display OK , Fault, or Not Run. OK indicates that no circuit faults are detected during the current test.

AIR Pump Relay Command

OFF

This parameter displays the commanded state of the AIR pump relay control circuit. The scan tool will display ON or OFF. ON indicates the AIR pump relay control circuit is being grounded by the control module, allowing voltage to the AIR pump. OFF indicates the AIR pump relay is not being commanded ON by the control module.

AIR Solenoid Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the AIR solenoid control circuit. The scan tool will display OK , Fault, or Not Run. OK indicates that no circuit faults are detected during the current test.

AIR Solenoid Ckt Open Test Status

AIR Solenoid Ckt Short Volts Test Status

AIR Solenoid Command

OFF

This parameter displays the commanded state of the AIR solenoid control circuit. The scan tool will display ON or OFF. ON indicates the AIR solenoid control circuit is being grounded by the control module, opening the AIR solenoid and allowing vacuum to the shut-off or combination valves. OFF indicates the AIR solenoid is not being commanded ON by the control module.

Ambient Air Temperature

Varies

Outside temperature at any given altitude expressed in degrees

APP Indicated Angle

Accelerator pedal not applied

This parameter displays the angle of the accelerator pedal as calculated by the control module using the signals from the accelerator pedal position sensors. The accelerator pedal position (APP) indicated angle is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

Accelerator pedal WOT

100%

APP Sensor

Varies

This parameter displays the average of the APP sensors as calculated by the throttle actuator control (TAC) module. The APP average is a range of values indicating a low number when the accelerator pedal is not depressed to a high number when the accelerator pedal is fully depressed. This value is listed in counts.

APP Sensor 1

Accelerator pedal not actuated

0.7-1.2 Volts

This parameter displays the voltage signal sent to the control module from APP sensor 1 of the APP sensor assembly. APP sensor 1 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.

Accelerator pedal fully actuated

4.2-4.5 Volts

APP Sensor 1 Indicated Position

Accelerator pedal not actuated

This parameter displays the angle of the APP sensor 1 as calculated by the control module using the signal from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

Accelerator pedal fully actuated

100%

APP Sensor 2

Accelerator pedal not actuated

0.3-0.5 Volts

This parameter displays the voltage signal sent to the control module from APP sensor 2 of the APP sensor assembly. APP sensor 2 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.

Accelerator pedal fully actuated

2.2-2.5 Volts

APP Sensor 2 Indicated Position

Accelerator pedal not actuated

This parameter displays the angle of the APP sensor 2 as calculated by the control module using the signal from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

Accelerator pedal fully actuated

100%

APP Sensor 1 and 2

Agree

This parameter displays the results of a control module test that compares the signals from the APP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond to different accelerator pedal positions.

BARO

Varies with altitude

This parameter displays the barometric pressure as calculated by the control module using the signal from the MAP sensor measured when the ignition is turned ON with the engine not running. The control module will update the barometric pressure during wide-open throttle (WOT) conditions.

BPP Signal

Released

This parameter displays the state of the brake pedal position switch as determined by the brake pedal switch. The scan tool will display Applied when the brake pedal is depressed, and Released when the brake pedal is not depressed.

BPP Circuit Signal

Released

The BCM uses the Brake Pedal Position sensor as an indication that the brake pedal is applied or released.

CAC Clnt Pump Relay Ckt Short Volts Test Status

This parameter displays the status of the output driver for the CAC Clnt pump relay control circuit. The scan tool will display OK , Fault, or Not Run. OK indicates that no circuit faults are detected during the current test.

CAC Clnt Pump Relay Ckt Open Test Status

CAC Clnt Pump Relay Ckt Short Gnd Test Status

CAC Clnt Pump Relay Command

Varies

This parameter displays the commanded state of the CAC Clnt pump relay control circuit. The CAC Clnt pump relay should be ON when the scan tool indicates the CAC Clnt Pump Relay Command is ON. The CAC Clnt pump relay should be OFF when the scan tool indicates the CAC Clnt Pump Relay Command is OFF.

Catalytic Converter Protection Active

This parameter indicates the status of the control module control for catalytic converter protection. The scan tool will indicate YES if the control module is adjusting fuel and ignition quantity and timing to protect the catalytic converter from damage. The scan tool will indicate NO if the control module is in a normal fuel and ignition control mode.

Calc. TWC Temp.

Varies

This parameter displays the catalytic converter temperature as calculated by the control module.

Calc. TWC Temp. Bank 1 and Bank 2

Varies

This parameter displays the catalytic converter temperature as calculated by the control module.

Change Engine Oil Indicator Command

This parameter displays the state of the change engine oil lamp control circuit as commanded by the control module.

CKP Resync Counter

Varies

This parameter displays the number of times the control module has to synchronize the CKP sensor.

CKP Sensor

Engine Idle Speed

This parameter displays the engine speed as calculated by the control module using the signal from the CKP sensor.

CKP Active Counter

Incrementing

This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position (CKP) sensor.

Cmmd. A/F Equivalence Ratio

Equivalence numbers greater than one represent excess fuel in the fuel air mix. Equivalence numbers less than one represent a deficiency of fuel in the fuel air mix for complete combustion. The equivalence ratio will be reported as one when the vehicle is in Closed Loop.

CMP Sensor

Engine Idle Speed

This parameter displays the engine speed as calculated by the control module using the signal from the CMP sensor.

Cold Startup

Varies

This parameter displays whether the engine meets the conditions for a cold startup during the present ignition cycle. The scan tool displays Yes when the conditions for a cold startup are met during this ignition cycle. The scan tool displays No when the conditions for a cold startup are not met during the present ignition cycle. Conditions for a cold startup require the coolant temperature and the intake air temperature to be below a predetermined temperature and within a certain range of each other. These conditions must occur after the engine was warmed up to a specific temperature during the previous ignition cycle.

Crank Request Signal

This parameter displays the state of the crank request input to the control module from the ignition switch. The scan tool will display Yes when the ignition switch is in the Crank position. The scan tool will display No when the ignition switch is in any other position.

Cruise Control Active

Inactive

This parameter displays the status of the cruise control system as determined by the control module. The scan tool will display Yes when the cruise control system is in control of vehicle speed. The scan tool will display No when the cruise control system is not operating.

Cruise Disengage 1-8 History

Cruise ON

None

The Scan tool displays the last 8 cruise control disengages in order from 1 to 8. There are 20 possible causes for the cruise control to disengage.

Cruise ON/OFF Switch

This parameter displays the state of the ON/OFF switch input to the control module. The scan tool will display ON when the cruise ON/OFF switch is ON. The scan tool will display OFF when the cruise ON/OFF switch is OFF.

Cruise Resume/Accel Switch

Invalid

This parameter displays the state of the Resume/Accel switch input to the control module When the cruise control switch is in the ON position and the Resume/Accel switch is activated, the scan tool displays ON. When the Resume/Accel switch is released the scan tool displays OFF.

Cruise Set/Coast Switch

Invalid

This parameter displays the state of the Set/Coast switch input to the control module from the cruise control system. When the cruise control switch is in the ON position and the Set/Coast switch is activated, the scan tool displays ON. When the Set/Coast switch is released the scan tool displays OFF.

Cruise Control Cancel Switch

Off

This parameter displays the status of the cruise control cancel switch as determined by the control module. The scan tool will display On when the cruise control cancel switch is on. The scan tool will display Off when the cruise control cancel switch is off.

Cycles of Misfire Data

Incrementing 0-100

This parameter displays the number of cylinder firing events recorded by the control module

Cyl. 1-8 IC Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Cyl. 1-8 IC Ckt Open Test Status

Cyl. 1-8 IC Ckt Short Volts Test Status

Cyl. 1-8 Inj. Ckt Short Gnd Test Status

Cyl. 1-8 Inj. Ckt Open Test Status

Cyl. 1-8 Inj. Ckt Short Volts Test Status

Decel. Fuel Cut-off

Inactive

This parameter displays the status of the operating mode used to turn OFF the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned OFF the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally.

Desired EGR Position

This parameter displays the position of the exhaust gas recirculation (EGR) valve commanded by the control module. The scan tool will display 0 percent when the control module is commanding the EGR valve closed. The scan tool will display a higher percentage when the EGR valve is commanded open.

Desired Exh CMP Bank 1 or 2

Varies in degrees

This parameter displays the desired exhaust camshaft position for Bank 1 or 2, as determined by the control module. The scan tool will display a higher value for more advanced exhaust valve timing, such as at high load or speed conditions. The scan tool will display a lower value for a less advanced exhaust valve timing, such as at idle.

Desired Idle Speed

650-700

This parameter displays the engine idle speed in RPM as commanded by the control module. The control module compensates for various engine loads in order to maintain the desired engine speed at idle. This parameter is not valid unless the engine is running

Desired Int. CMP Bank 1 or 2

Varies in degrees

This parameter displays the desired exhaust camshaft position for Bank 1 or 2, as determined by the control module. The scan tool will display a higher value for more advanced intake valve timing, such as at high load or speed conditions. The scan tool will display a lower value for a less advanced intake valve timing, such as at idle.

Distance Since DTC Cleared

Varies

This parameter displays the distance accumulated since an emission diagnostic trouble code was cleared. The scan tool will display increasing distance as the vehicle is driven.

Distance Since First Failure

Varies

This parameter displays the distance accumulated when the emission diagnostic trouble code first failed.

Distance Since Last Failure

Varies

This parameter displays the distance accumulated when the emission diagnostic trouble code last failed.

Drag Control Status

Inactive

Drop Throttle Control Mode is active when the Requested Torque Signal indicates greater than 90 percent duty cycle while the Traction Control System Data Control Signal input is active.

Drop Throttle Status

Inactive

Drop Throttle Control Mode is active when the Requested Torque Signal indicates greater than 90 percent duty cycle while the Traction Control System Data Control Signal input is active.

EC Ignition Relay Ckt Short Gnd Test Status

Not Run

This parameter displays the status of the output driver for the engine control (EC) Ignition Relay control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

EC Ignition Relay Ckt Open Test Status

Not Run

EC Ignition Relay Ckt Short Volts Test Status

EC Ignition Relay Command

This parameter displays the commanded state of the EC Ignition relay control circuit. The scan tool will display ON or OFF. ON indicates the EC ignition relay control circuit is being grounded by the control module, allowing voltage to other control module circuits and systems. OFF indicates the EC ignition relay is not being commanded ON by the control module.

EC Ignition Relay Feedback Signal

Battery Voltage

This parameter displays the voltage signal sent to the control module from the engine control ignition relay. The scan tool will display battery voltage when the engine is running. The scan tool will display no voltage when the relay is OFF.

ECM Authentication Status

Valid

This parameter indicates the result of the comparison between the last received immobilizer system response and the expected response calculated by the ECM.

ECM Challenge Status

Invalid

This parameter shows the immobilizer system status of the ECM challenge. This indicates whether the currently calculated ECM challenge is valid.

ECM Response Source

Normal

The parameter indicates the source used to calculate the ECM response. The sources include Normal Start, Remote Vehicle Start, PTO Remote Start.

ECT Sensor

85-105°C (185-220°F)

This parameter displays the temperature of the engine coolant based on the input from the engine coolant temperature (ECT) sensor. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature.

EGR Flow Test Count

This parameter indicates the number of EGR flow test samples collected during the current ignition cycle.

EGR Learned Minimum Position

0.57 Volts

This parameter displays the learned minimum position of the EGR valve as calculated by the control module. The scan tool will display a low value if the current closed EGR position is the same as the last ignition cycle. The scan tool will display a higher value if the EGR valve has closed at a new position.

EGR Position Sensor

This parameter displays EGR valve position as calculated by the control module based on an input from the EGR valve position sensor. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Position Sensor

0.57 Volts

This parameter displays the voltage signal received from the EGR valve position sensor by the control module. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Position Variance

This parameter displays the difference between the desired EGR valve position calculated by the control module and the actual EGR position input from the EGR valve position sensor. The scan tool will display a higher value if the difference is large, and a lower value if the difference is small.

EGR Solenoid Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the EGR solenoid control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

EGR Solenoid Ckt Open Test Status

EGR Solenoid Ckt Short Volts Test Status

EGR Solenoid Command

This parameter displays the duty cycle commanded by the control module for the EGR valve. The scan tool will display a high percentage when the EGR valve is commanded open. The scan tool will display a low percentage when the EGR valve is commanded closed.

Engine Load

25-30%

This parameter displays the engine load in percent based on inputs to the control module from various engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no load. The scan tool will display a high percentage when the engine is running at a high RPM under a heavy load.

Engine OFF Time

Varies

This parameter displays the time elapsed since the engine turned OFF. The scan tool will display the time in hours, minutes and seconds. The engine OFF time will reset to zero when the engine starts.

Engine Oil Level Switch

This parameter displays the status of the engine oil level switch as determined by the control module. The control module uses this information to turn ON the low engine oil lamp if the engine oil level remains approximately 1 quart low for a sufficient amount of time. The scan tool will display Low when the engine oil level is low. The scan tool will display OK when the engine oil level is correct.

Engine Oil Life Remaining

Varies

This parameter displays the amount engine oil life remaining before requiring an oil change based on calculations by the control module. The scan tool will display lower values as the engine oil life approaches 0 miles.

Engine Oil Pressure Switch

This parameter displays the state of the EOP as determined by the control module. The control module monitors the EOP switch to determine if the EOP is sufficient. The scan tool will display low when the EOP is below a predetermined value.

Engine Oil Temperature Calculated

Varies °C/°F

This parameter displays the temperature of the engine oil as calculated by the control module using various sensor inputs. The engine oil temperature calculated has a range of values indicating a low value when the oil temperature is low to a high value when the oil temperature is high.

Engine Run Time

Varies

This parameter displays the time elapsed since the engine was started. The scan tool will display the time in hours, minutes and seconds. The engine run time will reset to zero when the engine stops running.

Engine Speed

650 RPM

This parameter displays the speed of the crankshaft as determined by the control module using an input from the CKP sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds.

EPM Inhibit Reason

None

This parameter displays the reason for the regulated voltage control (RVC) override command. RVC lowers system operating voltage to reduce the system electrical load and improve fuel economy performance. The RVC command will be overridden if the voltage commanded is below the minimum system voltage required to ensure that the fuel demand, powertrain OBD diagnostics, airflow measurement, cylinder deactivation, or transmission control module functions will execute properly. Reasons include the following: None, Device Control, Fuel Demand, OBD Diagnostics, Airflow Measurement, Cylinder Deactivation, Transmission Control Module Request.

EVAP Fault History

No Fault

This parameter displays the result of the evaporative emission (EVAP) system diagnostic as determined by the control module. The scan tool will display various messages, depending on the result of the test.

EVAP Purge Solenoid Command

15%

This parameter displays the on-time or duty cycle of the EVAP purge solenoid commanded by the control module expressed as a percent. The scan tool will display a high percentage when the control module is commanding the EVAP purge solenoid to be open a large amount. The scan tool will display a low percentage when the control module is commanding the EVAP purge solenoid to be open a small amount. The scan tool will display 0 when the control module is commanding the EVAP purge solenoid closed.

EVAP Purge Solenoid Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the evaporative emission purge solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

EVAP Purge Solenoid Ckt Open Test Status

EVAP Purge Solenoid Ckt Short Volts Test Status

EVAP Vent Solenoid Command

Venting

This parameter displays the state of the EVAP vent solenoid commanded by the control module. The scan tool will display venting when the control module is commanding the EVAP vent solenoid to be open. The scan tool will display a not venting when the control module is commanding the EVAP vent solenoid to be closed.

EVAP Vent Solenoid Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the evaporative emission vent solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

EVAP Vent Solenoid Ckt Open Test Status

EVAP Vent Solenoid Ckt Short Volts Test Status

Exh CMP Angle Bank 1 or 2

0 Degrees

This parameter displays the actual exhaust camshaft position in degrees.

Exh CMP Bank 1 or 2 Command

0 Degrees

This parameter displays the degrees of advanced exhaust camshaft angle related to crankshaft position as commanded by the control module. The scan tool will display a higher value for a more advanced exhaust camshaft position. The scan tool will display a lower value when the exhaust camshaft is not being advanced, such as at idle.

Exh CMP Bank 1 or 2 Variance

0 Degrees

This parameter displays in degrees, the difference between the desired exhaust camshaft position and the actual exhaust camshaft position.

Exh CMP Bank 1 or Bank 2 Active Counter

Varies in counts

This parameter displays an incrementing counter when the control module receives a signal from the exhaust camshaft position (CMP) sensor.

Exh CMP Sol Bn 1 Ckt Short Volts Test Status

This parameter displays the diagnostic state of the output driver for the Exh CMP solenoid Bn 1 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Exh CMP Sol Bn 1 Ckt Open Test Status

Exh CMP Sol Bn 1 Ckt Short Gnd Test Status

Exh CMP Sol Bn 2 Ckt Short Volts Test Status

This parameter displays the diagnostic state of the output driver for the Exh CMP solenoid Bn 2 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Exh CMP Sol Bn 2 Ckt Open Test Status

Exh CMP Sol Bn 2 Ckt Short Gnd Test Status

Ext. Travel BPP Signal

Released

This parameter will display the state of the brake pedal, applied or released.

Fail Counter

Varies Counts

This parameter displays the number of times a specific diagnostic has run and failed.

FC Relay 1 Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the cooling fan relay 1 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

FC Relay 1 Ckt Open Test Status

FC Relay 1 Ckt Short Volts Test Status

Not Run

FC Relay 1 Command

Varies ON/OFF

This parameter displays the commanded state of the cooling fan relay 1 control circuit. The cooling fan relay 1 should be ON when the scan tool indicates the FC relay 1 command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the FC Relay 1 Command is OFF.

FC Relays 2 and 3 Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the cooling fan relays 2 and 3 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

FC Relays 2 and 3 Ckt Open Test Status

FC Relays 2 and 3 Ckt Short Volts Test Status

Not Run

FC Relays 2 and 3 Command

Varies ON/OFF

This parameter displays the commanded state of the cooling fan relays 2 and 3 control circuit. The cooling fan relays 2 and 3 should be ON when the scan tool indicates the FC Relay 2 and 3 command is ON. The cooling fan relays 2 and 3 should be OFF when the scan tool indicates the FC Relay 2 and 3 command is OFF.

Fuel Level Sensor

Varies

This parameter displays the voltage from the sensor used to monitor the fuel level inside the fuel tank. The scan tool will display a low voltage reading when that the fuel level in the tank is low or near empty. The scan tool will display a high voltage reading when the fuel level in the tank is high or near full.

Fuel Level Sensor Left or Right Tank

0-5 Volts

This parameter displays the voltage signal received by the control module from the fuel level sensors.

Fuel Pump Relay Ckt Short Volts Test Status

This parameter displays the diagnostic state of the Fuel Pump Relay circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Fuel Pump Relay Ckt Open Test Status

This parameter displays the diagnostic state of the Fuel Pump Relay circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Fuel Pump Relay Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the Fuel Pump Relay circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Fuel Pump Relay Command

This parameter displays the commanded state of the Fuel Pump Relay control circuit. The fuel pump relay should be ON when the scan tool indicates the Fuel Pump Relay command is ON. The fuel pump relay should be OFF when the scan tool indicates the Fuel Pump Relay Command is OFF.

Fuel Pump Relay Circuit Status

OK/Incomplete

This parameter displays the diagnostic state of the output driver for the Fuel Pump Relay control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display the appropriate fault if there is an open, short to ground or a short to voltage on the circuit.

Fuel Tank Level Remaining

Varies

This parameter displays the amount of fuel remaining in the fuel tank as measured in percentage. The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensors. The scan tool will display a higher value with a full fuel tank, and a lower value with an empty fuel tank.

Fuel Tank Pressure Sensor

1.5 Volts

This parameter displays the voltage signal sent to the control module from the sensor used to monitor the pressure inside the fuel tank. The scan tool will display a low voltage when the pressure in the fuel tank is high. The scan tool will display a high voltage when the pressure in the fuel tank is low or in a vacuum.

Fuel Tank Pressure Sensor

0 inches H2O (0 mm Hg)

This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low value when the pressure in the fuel tank is low or a vacuum. The scan tool will display a high value when the pressure in the fuel tank is high.

Fuel Tank Rated Capacity

17.5-20 gals (66.24-75.7 liter)

This parameter displays the rated maximum quantity of fuel the fuel tank will hold. This is calibrated in the control module to match the vehicle. See Owner's Manual-Capacities and Specifications.

Fuel Trim Cell

Varies

This parameter displays the fuel trim cell number as calculated by the control module based on engine speed and load inputs. The scan tool will display a lower number as conditions are nearer to idle, and a higher value as conditions approach maximum engine speed and maximum load.

Fuel Trim Learn

Enabled

This parameter indicated if the control module is adjusting long term fuel trim in response to the short term fuel trim. The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim corrections, the scan tool displays Enabled.

Fuel Trim System Test State

Monitoring

This parameter indicates the status of the Fuel Trim System Test. The scan tool will display Disabled, Enabled, Monitoring, or Run Purge Test.

Fuel Volatility

Varies

This parameter indicates the rate the fuel can be vaporized in the cylinder as calculated by the control module. The scan tool displays Low, Moderate, or High. The scan tool will display HIGH when the fuel volatility is high. The scan tool will display LOW when the fuel volatility is low.

GEN F-Terminal Signal

0-100%

This parameter indicates the generator field duty cycle as commanded by the voltage regulator or control module. The scan tool will display a higher value for a higher commanded generator output, and a lower value for a lower commanded generator output.

GEN L-Terminal Ckt Short Volts Test Status

This parameter displays the diagnostic state of the Gen- L Terminal circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

GEN L-Terminal Ckt Open Test Status

This parameter displays the diagnostic state of the Gen- L Terminal circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

GEN L-Terminal Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the Gen- L Terminal circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

GEN L-Terminal Command

0-100%

This parameter displays the control modules commanded state of the voltage regulator on the generator.

HO2S Bank 1 or 2 Sensor 1

80-850 mV

This parameter indicates the heated oxygen sensor (HO2S) bank 1 or bank 2, sensor 1 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions.

HO2S Bank 1 or 2 Sensor 1 Heater

0.60-0.80 amps

This parameter displays the current through the control module when the bank 1 or bank 2, sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bank 1 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.

HO2S Bn 1 or 2 Sen 1 Heater Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the HO2S Heater Bank 1 or Bank 2 Senor 1. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

HO2S Bn 1 or 2 Sen 1 Heater Ckt Open Test Status

HO2S Bn 1 or 2 Sen 1 Heater Ckt Short Volts Test Status

HO2S Bn 1 or 2 Sen 1 Heater Command

0-99%

This parameter displays the commanded state of the Bank 1 or Bank 2 Sensor 1 heater by the control module. The scan tool will display a higher value as the heater command is increased, and a lower value if the heater is not commanded ON.

HO2S Bn 1 or 2 Sen 1 Heater Command

This parameter displays the commanded state of the Bank 1 or Bank 2 Sensor 1 heater by the control module. The scan tool will display ON when the heater is commanded ON. The scan tool will display OFF when the heater is commanded OFF.

HO2S Bank 1 or 2 Sensor 2

80-850 mV

This parameter indicates the heated oxygen sensor (HO2S) bank 1 sensor 2 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions.

HO2S Bank 1 or 2 Sensor 2 Heater

0.60-0.80 amps

This parameter displays the current through the control module when the bank 1 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bank 1 Sensor 2 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.

HO2S Bn 1 Sen 2 Heater Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the HO2S Heater Bank 1 Sen. 2. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

HO2S Bn 1 Sen 2 Heater Ckt Open Test Status

HO2S Bn 1 Sen 2 Heater Ckt Short Volts Test Status

HO2S Bn 1 or 2 Sen 2 Heater Command

0-99%

This parameter displays the commanded state of the Bank 1 Sensor 2 heater by the control module. The scan tool will display a higher value as the heater command is increased, and a lower value if the heater is not commanded ON.

HO2S Bn 1 or 2 Sen 2 Heater Command

This parameter displays the commanded state of the Bank 1 Sensor 2 heater by the control module. The scan tool will display ON when the heater is commanded ON. The scan tool will display OFF when the heater is commanded OFF.

Hot Open Loop

Inactive

This parameter indicates the status of the fuel delivery system. The scan tool will display Active if the fuel system is running in open loop due to a temperature concern. The scan tool will display Inactive if the fuel system is operating normally.

IAT Sensor

Varies

This parameter displays the temperature of the air entering the engine as calculated by the control module based on the input from the intake air temperature (IAT) sensor. The scan tool will display a low value when the air temperature is low, and a high value when the air temperature is high.

IAT Sensor 2

Varies

This parameter displays the temperature of the air entering the engine as calculated by the control module based on the input from the IAT sensor 2. The scan tool will display a low value when the air temperature is low, and a high value when the air temperature is high.

Ignition Accessory Signal

OFF

This parameter displays the state of the ignition 0 input to the control module from the ignition switch. The scan tool will display ON when the ignition switch is in the ignition accessory position. The scan tool will display OFF when the ignition switch is in any other position.

Ignition 1 Signal

Battery Voltage

This parameter displays the voltage measured at the ignition 1 circuit of the control module. Voltage is applied to the control module when the ignition switch is in the ignition 1 position. The scan tool will display a low value when the voltage is low. The scan tool will display a high value, such as battery voltage, when the voltage is higher.

Ignition OFF Time

Varies

This parameter displays the time elapsed since the ignition was last turned OFF. The scan tool will display the time in hours, minutes and seconds. The ignition OFF time will reset to zero when the ignition is turned ON.

Injector PWM Bank 1 or Bank 2

2.0-5.4 ms

This parameter indicates the average commanded ON time for each injector on Bank 1 or Bank 2 by the control module. The scan tool will display a larger value for a longer injector commanded ON time, causing more fuel to be delivered to the cylinders. The scan tool will display a smaller value for a shorter injector commanded ON time, causing less fuel to be delivered to the cylinders.

Injector 1-8 Disabled Due To Misfire

Int. CMP Angle Bank 1 or 2

0 Degrees

This parameter displays the degrees of advanced intake camshaft angle related to crankshaft position as determined by the control module based on input from the intake CMP sensors. The scan tool will display a higher value for a more advanced intake camshaft position. The scan tool will display a lower value when the intake camshaft is not being advanced, such as at idle.

Int. CMP Bank 1 or 2 Command

0 Degrees

This parameter displays the degrees of advanced intake camshaft angle related to crankshaft position as commanded by the control module. The scan tool will display a higher value for a more advanced intake camshaft position. The scan tool will display a lower value when the intake camshaft is not being advanced, such as at idle.

Int. CMP Bank 1 or 2 Variance

0 Degrees

This parameter indicates the difference between the actual camshaft angle and the commanded camshaft angle as determined by the control module. The scan tool will display a higher value for larger differences, or a lower value if there is only a small difference.

Int. CMP Bank 1 or 2 Active Counter

Varies in counts

This parameter displays an incrementing counter when the control module receives a signal from the intake camshaft position (CMP) sensor.

Int CMP Sol Bn 1 Ckt Short Volts Test Status

This parameter displays the diagnostic state of the output driver for the Int CMP solenoid Bn 1 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Int CMP Sol Bn 1 Ckt Open Test Status

Int CMP Sol Bn 1 Ckt Short Gnd Test Status

Int CMP Sol Bn 2 Ckt Short Volts Test Status

This parameter displays the diagnostic state of the output driver for the Int CMP solenoid Bn 2 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Int CMP Sol Bn 2 Ckt Open Test Status

Int CMP Sol Bn 2 Ckt Short Gnd Test Status

Intake Manifold Pressure

70-75 kPa

This parameter displays the pressure difference between the MAP and the barometric pressure (BARO) as calculated by the control module. The scan tool will display a higher value during high vacuum conditions, such as idle or deceleration. The scan tool will display a lower value during low vacuum conditions, such as wide open throttle or low load cruising.

Knock Detected Cyl. 1-8

This parameter displays the status of each cylinder for knock detection by the control module. The scan tool will display YES if a knock condition has been detected related to that cylinder combustion event. The scan tool will display NO if there is no knock condition detected related to that cylinder combustion event.

Knock Retard

This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensors. The scan tool displays a high value for a large amount of spark retard, and a low value for a small amount of spark retard.

Long Term FT Bank 1 or Bank 2

0% ± 10%

This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 1 is used for the long term correction of the fuel delivery in bank or bank 2. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

LT FT Test Avg. Bank 1 or Bank 2

This parameter is calculated by the control module based on an intrusive test by the control module. The Long Term FT test average used for the long term correction of the fuel delivery in each bank. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

LT FT Avg. Bank 1 or Bank 2 w/o Purge

This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 1 is used for the long term correction of the fuel delivery in bank 1. The scan tool will display a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

Loop Status

Closed

Low EOP Indicator Command

OFF

•	This parameter displays the commanded state of the low oil lamp control circuit. The low oil lamp should be ON when the scan tool indicates the Low Oil Lamp Command is ON. The low oil lamp should be OFF when the scan tool indicates the Low Oil Lamp Command is OFF.

•	The scan tool displays ON/OFF

•	The scan tool displays ON or OFF. The scan tool displays ON when the ECM detects that there is a low oil level condition. The low oil lamp is then commanded ON by the ECM.

•	Scan tool displays ON or OFF. Represents the commanded state of the Low Oil Lamp indicator control circuit.

MAF Performance Test

This parameter displays the status of the mass air flow (MAF) performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.

MAF Sensor

Engine Idling

3.4-6.5 g/s

This parameter indicates the quantity calculated by the control module based on a signal from the MAF sensor. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds.

Engine speed at 2,500 RPM

11.88 g/s

MAF Sensor

1510-3224 Hz

This parameter indicates the frequency signal received from the MAF sensor by the control module. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds.

MAP Performance Test 1

This parameter displays the status of the MAP performance test 1 by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.

MAP Performance Test 2

This parameter displays the status of the MAP performance test 2 by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.

MAP Sensor

30-38 kPa

This parameter indicates the manifold absolute pressure inside the engine as calculated by the control module based on the signal from the MAP sensor. The scan tool will display a higher value wide open throttle, and a lower value at idle.

MAP Sensor

0.75-1.40 Volts

This parameter indicates the voltage signal received by the control module from the MAP sensor. The scan tool displays a low voltage at idle, and a high voltage at wide open throttle. Barometric pressure and altitude can effect these values.

MIL Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the malfunction indicator lamp control (MIL) circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

MIL Ckt Open Test Status

MIL Ckt Short Volts Test Status

Not Run

MIL Command

OFF

This parameter displays the commanded state of the MIL control circuit. The MIL should be ON when the scan tool indicates the MIL Command is ON. The malfunction indicator lamp should be OFF when the scan tool indicates the MIL Command is OFF. The control module will command the MIL ON when the ignition is ON with the engine OFF in order to perform a bulb check.

MIL Requested by DTC

Misfire Current Cyl. 1-8

This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinders 1-8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Misfire History Cyl. 1-8

This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinders 1-8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders.

Not Run Counter

Varies

This parameter displays the number of ignition cycles that a DTC has not run. The scan tool display will increment as the number of ignition cycles increase without a DTC pass or Fail.

Pass Counter

Counts

The scan tool displays the number of times a DTC has run and passed.

PNP Switch

P/N

This parameter indicates the range selection of the automatic transmission as calculated by the control module based on input from the PNP switch. The scan tool will display, In Gear, Park, or Neutral depending on the PNP switch position.

Power Enrichment

Inactive

This parameter indicates if the control module has detected conditions appropriate to operate in Power Enrichment mode. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module enters Open Loop operation and increases injector pulse width when in power enrichment mode.

Reduced Engine Power

Inactive

This parameter indicates if the control module has detected that a TAC system fault has occurred. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module limits engine power when this mode is Active.

Reverse Inhibit Command

OFF

This parameter displays the commanded state of the reverse inhibit solenoid control circuit. The reverse inhibit solenoid should be ON when the scan tool indicates the Reverse Inhibit Solenoid Command is ON. The reverse inhibit solenoid should be OFF when the scan tool indicates the Reverse Inhibit Solenoid Command is OFF.

Reverse Inhibit Solenoid Command

OFF

Rev. Inhibit Solenoid Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the output driver for the Reverse Inhibit Solenoid circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Rev. Inhibit Solenoid Ckt Open Test Status

Rev. Inhibit Solenoid Ckt Short Volts Test Status

RVS Disable 1-8 History

None

This parameter displays one of the last eight reasons that powertrain has disabled remote vehicle start (RVS).

RVS Request Signal

ON/OFF

This parameter indicates the state of the request received over serial communication from the remote vehicle start (RVS) system to start the vehicle in remote mode.

SC Inlet Pressure Sensor

Varies

This parameter indicates the pressure at the supercharger inlet as calculated by the control module based on the signal from the supercharger inlet pressure (SCIP) sensor. The scan tool will display a higher value wide open throttle, and a lower value at idle.

SC Inlet Pressure Sensor

Varies

This parameter indicates the voltage signal received by the control module from the SCIP sensor. The scan tool displays a low voltage at idle, and a high voltage at wide open throttle. Barometric pressure and altitude can effect these values.

SC Inlet Pressure

Varies

This parameter indicates the pressure at the supercharger inlet as calculated by the control module based on the signal from the SCIP sensor. The scan tool will display a higher value wide open throttle, and a lower value at idle.

SCB Solenoid Command

Varies

This parameter displays the commanded state of the supercharger bypass (SCB) solenoid control circuit. The scan tool will display a percent duty cycle. A lower value indicates the solenoid is not being commanded open, resulting in higher boost pressure. A higher value indicates the solenoid is being commanded ON, resulting in lower boost pressure because the bypass valve is venting air around the supercharger.

SCB Sol Ckt Short Volts Test Status

This parameter displays the status of the output driver for the SCB solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit.

SCB Sol Ckt Open Test Status

SCB Sol Ckt Short Gnd Test Status

Short Term FT Bank 1 or Bank 2

0% ± 10%

This parameter displays the short term correction to fuel delivery for bank 1 or bank 2 by the control module in response to the amount of time the oxygen sensor voltage spends above or below the 450 mV threshold. The scan tool will display 0 percent if no adjustments are required. The scan tool will display a higher positive value if fuel has to be added, and a higher negative value if fuel has to be removed.

Spark

9-11°

This parameter displays the spark timing being commanded by the control module ON the IC circuit. The scan tool will display a negative value if the spark timing is before top dead center (BTDC) or spark advance; the scan tool will display a positive value if the spark timing is after top dead center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value BTDC while operating in bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode.

Start Up ECT

Varies

This parameter Indicates the engine coolant temperature at engine start up as calculated by the control module based on the signal from the ECT sensor. The scan tool will display a higher value on a warmer engine, and a lower value on a colder engine.

Start Up IAT

Varies

This parameter Indicates the intake air temperature at engine start up as calculated by the control module based on the signal from the IAT sensor. The scan tool will display a higher value during warmer under hood temperatures, and a lower value during colder under hood temperatures.

ST FT Test Avg. Bank 1 or Bank 2

This parameter is calculated by the control module based on an intrusive test by the control module. The Short Term FT Test Average used for the short term correction of the fuel delivery in each bank. The scan tool will display a high value for a large amount of short term fuel correction, and 0% for no short term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event.

Starter Relay Ckt Short Gnd Test Status

The scan tool displays OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Starter Relay Ckt Open Test Status

The scan tool displays OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Starter Relay Ckt Short Volts Test Status

Not Run

The scan tool displays OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Starter Relay Command

OFF

The scan tool displays ON/OFF. The scan tool displays OFF until the ignition is placed into the CRANK position, then it reads ON.

TAC Forced Engine Shutdown

This parameter indicates the status of TAC control by the control module. The scan tool will display YES if the engine has been shut down due to a throttle control fault. The scan tool will display NO if the engine has not been shut down by a throttle control fault.

TAC Motor

Enabled

This parameter indicates the status of the TAC motor driver by the ECM. The scan tool will display Enabled if TAC motor operation is allowed. The scan tool will display disabled if the TAC motor is disabled.

TAC Motor Command

15-25%

This parameter indicates the required duty cycle to maintain a desired throttle position. The scan tool will display a higher value if more effort is required to move the throttle to the desired position, such as physical resistance. The scan tool will display a lower value if less effort is required to move the throttle to the desired position.

TCS and Drop Throttle Status

Inactive

TCS Active and Drop Throttle Control Mode is active when the Requested Torque Signal is within the TCS region, 40-90 percent duty cycle, while the Traction Control System Data Control Signal input is Active.

TCS Torque Request Signal

3 N·m (2 lbs ft)

This parameter indicates the percentage of available torque requested from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.

TCS Torque Request Signal

100%

This parameter indicates the torque requested from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.

TCS Torque Delivered Signal

This parameter indicates the torque delivered from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.

TFT Sensor

Varies °C/°F

•	The scan tool displays °C (°F). This value represents the input signal of the transmission fluid temperature sensor.

•	The scan tool range is -40 to +150°C (-40 to +302°F). This display indicates the temperature of the transmission fluid.

•	Scan Tool Range -39 to +140°C (-38 to +284°F). The Trans Fluid Temp. sensor parameter displays the temperature of the manual transmission.

Torque Management Spark Retard

0°

This parameter indicates how much the ignition spark timing is being retarded to control torque by the control module. The scan tool will display a higher value under extreme torque control conditions such as spinning wheels. The scan tool will display a lower value under low torque control conditions such as light driving.

Total Knock Retard

0°

This parameter indicates how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions.

Total Misfire

This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on all cylinders as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter.

TP Desired Angle

2-6%

This parameter indicates the desired throttle angle calculated by the TAC module as commanded by the vehicle operator. The scan tool will display a higher value when the accelerator pedal is depressed, and a lower value as the accelerator pedal is released.

TP Indicated Angle

2-6%

This parameter displays the angle of the throttle plate as calculated by the control module using the signals from the throttle position (TP) sensors. The TP indicated angle is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is wide open.

TP Performance Test

This parameter displays the status of the TP performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.

TP Sensor 1

4.1-4.5 Volts

This parameter displays the voltage signal sent to the control module from TP sensor 1 of the throttle assembly. The TP sensor 1 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate is fully open.

TP Sensor 1 Indicated Position

This parameter displays the angle of the throttle position (TP) sensor 1 as calculated by the control module using the signal from the TP sensor 1. The TP sensor 1 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open.

TP Sensors 1 and 2

Agree

This parameter displays the results of a control module test that compares the signals from the TP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that TP sensor 1 and TP sensor 2 voltages correspond to the same throttle position. Disagree indicates that TP sensor 1 and TP sensor 2 voltages correspond to different throttle positions.

TP Sensor 2

0.5-0.8 Volts

This parameter displays the voltage signal sent to the control module from TP sensor 2 of the throttle assembly. The TP sensor 2 is a range of values indicating a low voltage when the throttle is closed to a high voltage when the throttle plate is fully open.

TP Sensor 2 Indicated Position

This parameter displays the angle of the TP sensor 2 as calculated by the control module using the signal from the TP sensor 2. The TP sensor 2 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open.

Torque Delivered Signal

Varies lbs ftN·m

•	This parameter indicates the amount of available engine torque.

•	Scan tool range 0-100 percent. Represents the PWM signal which indicates the percent of available torque the engine is delivering to the drive wheels. The EBTCM monitors the Traction Control Torque signal to ensure that the PCM is responding properly to the Traction Control Desired Torque signal.

•	The scan tool displays -473 to +473 N·m/-349 to 349 lbs ft This is the calculated torque output from the engine to the transaxle used by the EBTCM for the traction control system operation.

Traction Control Status

Inactive

This parameter indicates the status of the traction control system as reported by the control module. The scan tool will display ACTIVE if the traction control system is taking action to reduce drive wheel slippage. The scan tool will display INACTIVE if the traction control system is not being required to take action to reduce drive wheel slippage.

Vehicle Speed Ckt Short Volts Test Status

This parameter displays the diagnostic state of the Vehicle Speed Sensor circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Vehicle Speed Ckt Open Test Status

This parameter displays the diagnostic state of the Vehicle Speed Sensor circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Vehicle Speed Ckt Short Gnd Test Status

This parameter displays the diagnostic state of the Vehicle Speed Sensor circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly.

Vehicle Speed Sensor

0 km/mi

This parameter indicates the vehicle speed as calculated by the control module based on a signal from the vehicle speed sensor (VSS). The scan tool will display a higher value at higher vehicle speeds, and a lower value at lower vehicle speeds.

VTD Auto. Learn Counter

Counts

The scan tool displays the count value when using the 30-minute reprogramming procedure. Three 10-minute cycles, or three counts, are required to complete the 30-minute auto learn reprogramming procedure.

VTD Auto. Learn Timer

Inactive

VTD Fuel Disable

Inactive

This parameter indicates the VTD system has disabled fuel.

VTD Fuel Disable Until Ign. OFF

This parameter indicates the VTD system has disabled fuel for the remainder of the ignition cycle.

VTD Fuel Enabled

Yes

This parameter indicates the VTD system has enabled fuel.

VTD Password Learn Enabled

The scan tool will display Yes when a valid theft password has been learned.

VTD Password Learned

VTD Security Code Accepted

This parameter indicates that the received immobilizer system security code is correct.

VTD Security Code Lockout

Inactive

This parameter displays Active or Inactive. Security Code Lockout Active indicates that the security code has not passed and lockout is active.

VTD Security Code Programmed

This parameter indicates if the immobilizer system security code has been programmed.

VTD Security Info. Programmed

Yes

This parameter indicates if the immobilizer secret information, e.g. powertrain pre-release password, powertrain secret key, has been programmed.

VTD System Status

Dis. Neg. Resp.

This parameter indicates the current state of the immobilizer algorithm. The states include the following: Standby, Disabled at Startup, Disabled Due to No Response, Disabled Due to Negative Response, Disabled Due to Incorrect Response, Post Release, Pre-Release, Released.

Warm-ups Since DTC Cleared

Varies

Warm-ups w/o Emission Faults

Varies

This parameter indicates the number of warm up cycles that have occurred without an emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without an emission fault.

Warm-ups w/o Non-emission Faults

Varies

This parameter indicates the number of warm up cycles that have occurred without a non-emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without a non-emission fault.

Wide Open Throttle

This parameter indicates the throttle status commanded by the control module. The scan tool will display YES is the vehicle throttle is commanded to wide open. The scan tool will display NO if the vehicle throttle is commanded to an amount less than 100%.

Output Control

Parameter

Description

A/C Relay

The engine must be running and the ECM must receive an A/C request from the HVAC control module in order to enable the output control. The ECM de-energizes the A/C compressor clutch relay when you select OFF. The relay remains de-energized until you select ON.

AIR Pump Relay

Activates the secondary air injection (AIR) solenoid relay and AIR pump relay. The normal commanded state of the relay is NONE. With the system commanded ON, the system remains ON for a maximum of 30 seconds.

AIR Service Bay Test

Activates the on-board AIR diagnostic test.

AIR Solenoid

Enables and disables the AIR solenoid.

AIR System

Activates the AIR system by turning the AIR pump relay and AIR solenoid ON or OFF

CAC Coolant Pump

This function activates the charge air cooler (CAC) coolant pump relay. The normal commanded state is NONE. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool.

Cylinder Power Balance

Enables/disables a cylinder by turning OFF the fuel injector to the cylinder. The fuel injector is normally enabled. The control module disables the fuel injector when the following conditions are met:

•	The engine speed has stabilized.

•	The fuel injector has been selected.

When DISABLE is selected, the control module turns the injector OFF for 30 seconds.

Dash Lamps

Malfunction Indicator Lamp--Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool.

EGR Solenoid

Activates the exhaust gas recirculation (EGR) Solenoid that controls EGR valve position. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of valve opening by 10 percent increments within a range of 0-90 percent. The system remains in the commanded state until cancelled by the tool. If the engine is running, too much EGR will result in a rough idle and/or stalling.

Engine Controls Ignition Relay

This function activates the engine control (EC) ignition relay. The normal commanded state is NONE. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool.

Engine Speed Control

Activates the idle air control (IAC) valve to change engine RPM. The normal commanded state is NONE. To enable the RPM control, all instruction on the scan tool must be completed. The system will INCREASE or DECREASE the engine speed. The SET STEP VALUE changes the engine speed by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the tool.

EVAP Purge Solenoid

Activates the EVAP Purge Valve. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure exceeds 24 mm Hg (12 in H2O).

EVAP Service Test

Activates the on-board EVAP diagnostic test.

EVAP Vent Solenoid

Activates the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state unless one of the following conditions occurs:

•	Cancelled by the tool

•	Purge is greater than 0 percent, and the fuel tank pressure exceeds 24 mm Hg (12 in H2O).

EVAP Purge/Seal

This control enables 2 functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON (non-venting). The normal commanded state of both valves is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The second function seals the system after using the purge function to obtain a specific amount of fuel tank pressure (FTP). When activated the purge valve is commanded to 0 percent and the vent valve is commanded ON (non-venting). Both functions remain in the commanded state until cancelled by the tool or the FTP exceeds 24 mm Hg (12 in H2O).

Exhaust CMP Actuator Bank 1

This function controls the exhaust camshaft actuator for bank 1. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 25 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

•	The vehicle speed is 0 km/h (0 mph).

•	The transmission is in Park or Neutral.

•	The engine speed is between 1,000-1,400 RPM.

The system remains in the commanded state until cancelled by the scan tool.

Exhaust CMP Actuator Bank 2

This function controls the exhaust camshaft actuator for bank 2. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 25 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

•	The vehicle speed is 0 km/h (0 mph).

•	The transmission is in Park or Neutral.

•	The engine speed is between 1,000-1,400 RPM.

The system remains in the commanded state until cancelled by the scan tool.

Exhaust CMP Actuator Sol. Bank 1

This function controls the exhaust camshaft actuator solenoid for bank 1. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Exhaust CMP Actuator Sol. Bank 2

This function controls the exhaust camshaft actuator solenoid for bank 2. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Fan Relay 1

Commands the low speed fan relay ON and OFF. Both cooling fans will activate on low speed

Fan Relays 2 and 3

Commands the series parallel and high speed fan relays ON and OFF. The driver side fan will be OFF. The passenger side fan will activate on high speed.

Fan Relays 1, 2 and 3

Commands the low speed fan , high speed fan, and series parallel relays ON and OFF. Both fans will activate on high speed.

Fuel Injector Balance

Enables the fuel injector in order to verify proper fuel injector flow. The ECM will pulse the selected injector when the following conditions are met:

•	All instruction on the scan tool completed

•	Fuel injector selected

•	Key ON, engine OFF

The selected fuel injector can only be flowed/pulsed once per ignition cycle.

Fuel Pump Relay

Controls the fuel pump relay. The normal commanded state is NONE. When commanded ON/OFF, the PCM turns the fuel pump ON/OFF. If the engine is running, and the fuel pump is commanded OFF, the engine will stall. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Enable

Disables the ECM ability to learn new fuel trim parameters. The commanded states are NONE, ENABLED, DISABLED. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the scan tool.

Fuel Trim Reset

Activates the reset of fuel trim data in all fuel trim cells.

GEN L-Terminal

The commanded states are ON and OFF. Selecting OFF commands the ECM to turn OFF the generator and stop generating an output voltage.

HO2S Heater Bank 1 Sensor 1 Command

Activates the HO2S bank 1 sensor 1 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 1 sensor 1 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool.

HO2S Heater Bank 1 Sensor 2 Command

Activates the HO2S bank 1 sensor 2 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 1 sensor 2 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool.

HO2S Heater Bank 2 Sensor 1 Command

Activates the HO2S bank 2 sensor 1 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 2 sensor 1 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool.

HO2S Heater Learn

This output control is used to trigger the reset of the learned resistances for the oxygen sensor heaters following a replacement in service. The learned resistances are reset to a calibration used to prevent overheating of the sensors until more accurate resistances may be learned following an extended engine OFF time, typically 12 or more hours.

Idle Spark

Disables and enables idle spark advance with the engine running.

Intake CMP Actuator Bank 1

This function controls the intake camshaft actuator for bank 1. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 20 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

•	The vehicle speed is 0 km/h (0 mph).

•	The transmission is in Park or Neutral.

•	The engine speed is between 1,000-1,400 RPM.

The system remains in the commanded state until cancelled by the scan tool.

Intake CMP Actuator Bank 2

This function controls the intake camshaft actuator for bank 2. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 20 crankshaft degrees. The scan tool initiates the test when the following conditions are met:

•	The vehicle speed is 0 km/h (0 mph).

•	The transmission is in Park or Neutral.

•	The engine speed is between 1,000-1,400 RPM.

The system remains in the commanded state until cancelled by the scan tool.

Intake CMP Actuator Sol. Bank 1

This function controls the intake camshaft actuator solenoid for bank 1. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Intake CMP Actuator Sol. Bank 2

This function controls the intake camshaft actuator solenoid for bank 2. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON with the engine OFF.

•	No engine speed is detected.

The system remains in the commanded state until cancelled by the scan tool.

Loop Status

Controls the system loop status. The commanded states include NONE, OPEN, or CLOSED. The normal commanded state is NONE. When commanded OPEN or CLOSED, the system remains in the commanded state until cancelled by the scan tool.

Malfunction Indicator Lamp

Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool.

Misfire Graphic

Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph.

Reverse Inhibit

This device control is used to override the state of the Reverse Inhibit output.

RVS Disable History Reset

This output control is used to trigger the reset of the last 8 reasons the ECM has disabled remote vehicle start (RVS).

SCB Control

Activates the solenoid from the none, increase, and decrease in increments and decrements by 10%. The range is 0-100%.

Spark Retard

Controls the amount of spark retard. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of spark retard by 1 degree increments within a range of 0-10 degrees maximum retard. The system remains in the commanded state until cancelled by the tool.

Starter Relay

This output control is used to override the state of the Starter Relay output. Fuel and spark are disabled to prevent the engine from starting if the starter relay output is commanded ON.

Throttle Position

This function opens the throttle plate in 10 percent increments. The scan tool initiates the test when the following conditions are met:

•	The ignition is ON, with the engine OFF.

•	The vehicle speed is 0 km/h (mph).

The system remains in the commanded state until cancelled by the scan tool.