Engine Control Module Scan Tool Information. Chevrolet Equinox 2009

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Equinox 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Engine Control Module Scan Tool Information

Engine Control Module Scan Tool Information LY7

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.

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
5-volt Reference 1 Circuit Status	--	OK	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 Circuit Status	--	OK	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 3 Circuit Status	--	OK	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 the last 8 air conditioning (A/C) compressor disengages in order from 1 to 8 with 8 being the most recent. There are about 8 possible causes for the A/C compressor to disengage.
A/C High Side Pressure	A/C OFF	1.24 Volts	This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module.
A/C High Side Pressure	A/C ON	1.45 Volts
A/C High Side Pressure	A/C OFF	500-2,200 kPa (72-319 psi)	This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module.
A/C High Side Pressure	A/C ON	300-1,200 kPa (43-174 psi)
A/C Off for WOT	A/C ON	No	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	No	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	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 open.
A/C Relay Ckt Short Volts 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 voltage.
A/C Relay Command	A/C ON	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.
Air Flow Calculated	--	g/s Varies	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).
Ambient Air Temperature	--	°C °F Varies	This parameter displays the surrounding air temperature.
APP Indicated Angle	Accelerator pedal not actuated	0%	This parameter displays the angle of the accelerator pedal position (APP) as calculated by the control module using the signals from the APP sensors.
APP Indicated Angle	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.
APP Sensor 1	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.
APP Sensor 2	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.
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 +40°C (-38 to +104°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	--	-39 to +140°C (-38 to +284°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.
Calc. TWC Temp. Bank 1 and 2	--	414°C (773°F)	This parameter displays the catalytic converter temperature as calculated by the control module.
Catalytic Converter Protection Active	--	No	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 Resync Counter	--	0 Counts	This parameter displays the number of times the control module re-syncs with the CKP sensor.
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 Start Switch, If Equipped	Clutch pedal fully actuated	On
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 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.
Commanded A/F Equivalence Ratio	--	14.7:1	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 around 14.2-14.7 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.
CPP Switch, If Equipped	Clutch pedal fully actuated	Applied
Crank Request Signal	Ignition switch not in the crank position	No	This parameter displays whether the ignition switch has been cycled to the crank position requesting the control module to activate the starter relay.
Crank Request Signal	Ignition switch in the crank position	Yes
Cruise Control Active	--	No	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 about 33 possible causes for the cruise control to disengage.
Cruise Inhibited	Cruise ON	No	The parameter displays the reason why the cruise control system is inhibited.
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.
Current Gear	Transmission not in Park/Neutral	Reverse/1st-5th
Cycles of Misfire Data	--	0-200 counts	This parameter displays the number of misfire tests during 200 engine revolutions.
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 OpenTest 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 VoltsTest 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.
Cylinder 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.
Desired Exh. CMP Bank 1 or 2	Engine speed at 2000 RPM	10 Degrees
Desired HO2S Bank 1 or 2 Sensor 1	--	Varies 400-700 mV	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.
Desired Idle Speed	--	Approximately 650 RPM	This parameter displays the desired engine idle speed as commanded by the control module.
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.
Desired Int. CMP Bank 1 or 2	Engine speed at 2000 RPM	10 Degrees
DTC Set This Ignition	--	No	This parameter displays Yes if a DTC set on the current ignition cycle.
EC Ignition Relay Command	--	On	This parameter displays the state of the control circuit for control module power relay as commanded by the control module.
EC Ignition Relay Circuit Test Status	--	OK/Fault/Not Run	This parameter displays the state of the EC Ignition Relay control circuit. The parameter displays Fault if the EC Ignition Relay control circuit is open, shorted to ground, or shorted to voltage.
EC Ignition Relay Feedback Signal	--	12.0-14.5 Volts	This parameter displays the voltage available at the EC ignition relay pin of the control module.
ECM Reset	--	No	This parameter displays Yes when an internal control module reset occurs. The scan tool displays NO under normal operating conditions.
ECM in VTD Fail Enable	--	No	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 Load	Engine speed at 2,500 RPM	40-60%
Engine OFF EVAP Test Conditions Met	--	No	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	--	OK	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	--	103 kPa (15 psi) to 241 kPa (35 psi)	This parameter displays the engine oil pressure.
Engine Oil Temperature Sensor	--	97°C (204°F)	This parameter displays the engine oil temperature.
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 Speed	Engine Idling	550-700 RPM
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.
Extended Traval Brake Pedal Switch	--	Released	This parameter will display the state of the brake pedal, applied or released.
Exh. CMP Angle Bank 1 or 2	Engine Idling	0 Degrees	This parameter displays the actual exhaust camshaft position in degrees.
Exh. CMP Angle Bank 1 or 2	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.
Exh. CMP Angle Bank 1 or 2 Variance	Engine speed at 2000 RPM	10 Degrees
Exh. CMP Bank 1 or 2 Command	Engine Idling	20%	This parameter displays the exhaust camshaft position in percent of range as commanded by the control module.
Exh. CMP Bank 1 or 2 Command	Engine speed at 2000 RPM	50%
Exh CMP Sol Bn 1 or 2 Ckt ShortGnd 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.
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	Engine coolant less than 108°C (226°F) A/C Off	Off	This parameter displays the control module commanded state of the fan relay control circuit.
FC Relay 1 Command	Engine coolant greater than 108°C (226°F) A/C On	On
FC Relay 2 and 3 Command	Engine coolant less than 108°C (226°F) A/C OFF	Off	This parameter displays the control module commanded state of the fan relay control circuit.
FC Relay 2 and 3 Command	Engine coolant greater than 108°C (226°F) A/C ON	On
Fuel Level	--	0-100%	This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module.
Fuel Level Sensor Left Tank (Secondary) and Fuel Level Sensor Right Tank (Primary)	--	0-5 Volts	This parameter displays the voltage signal received by the control module from the fuel level sensors.
Fuel Pump Relay Ckt Short Gnd Test Status	--	OK/Not Run	This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is shorted to ground.
Fuel Pump Relay Ckt Open Test Status	--	OK/Not Run	This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is open.
Fuel Pump Relay Ckt Short Volts Test Status	--	OK/Not Run	This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is shorted to voltage.
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.
Fuel Pump Relay Command	Engine idling	On
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 from information received from the left and right fuel level sensors.
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	--	17.8 Gallons (67.3 Liters)	This parameter displays the capacity of the fuel tank in liters or gallons.
Fuel Trim Learn	--	Enabled	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.
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	--	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 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 Heater Monitor Complete This Ignition	--	Yes	This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
HO2S Heater Monitor Enabled This Ignition	--	Yes	This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
HO2S Bank 1 Sensor 2 Heater 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 Bank 1 Sensor 2 Heater 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 Bank 1 Sensor 2 Heater 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 Htr. Bn. 1 or 2 Sensor 1 Command	--	0-99%	This parameter displays the commanded state of the heater control circuit as commanded by the control module.
HO2S/O2S Monitor Complete This Ignition	--	Yes	This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
HO2S/O2S Monitor Enabled This Ignition	--	Yes	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 0 Signal	--	On	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	--	On	This parameter displays On when the control module detects a voltage at the ignition 1 input terminal.
IMRC Solenoid Circuit Status, If Equipped	--	OK/Fault/Not Run	This parameter displays the state of the intake manifold runner control (IMRC) control circuit. The parameter displays Fault if the IMRC control circuit is open, shorted to ground, or shorted to voltage.
IMRC Solenoid Command, If Equipped	--	Off	This parameter displays the control modules commanded state of the IMRC 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).
Initial Brake Apply Signal	Brake pedal fully actuated	Applied
Injector 1-6 Command	Engine idling	0.82-1.20 ms	This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module.
Int. CMP Angle Bank 1 or 2	Engine Idling	0 Degrees	This parameter displays the actual intake camshaft position in degrees.
Int. CMP Angle Bank 1 or 2	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 exhaust camshaft position.
Int. CMP Angle Bank 1 or 2 Variance	Engine speed at 2000 RPM	0 Degrees
Int. CMP Bank 1 or 2 Command	Engine Idling	0 Degrees	This parameter displays the intake camshaft position in percent of range as commanded by the control module.
Int. CMP Bank 1 or 2 Command	Engine speed at 2000 RPM	50 Degrees
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 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 1 or 2 Signal	--	3.86-5.02 Volts	This parameter 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.
LT FT Bn. 1 or Bn.	--	0%	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.	--	0%	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	3.4-6.3 g/s	This parameter displays the measured quantity of air flowing into the engine during all operating conditions.
MAF Sensor	Engine speed at 2,500 RPM	11.88 g/s
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	--	No	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	--	0	The scan tool displays a range of 0-200 counts. This parameter displays the number of misfires that have been detected during the last 200 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	--	0	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 200 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).
Moderate Brake Apply Signal	Brake pedal fully actuated	Applied
PNP Switch	Transmission in Park/Neutral	Park/Neutral	This parameter displays whether the transmission range selector is in park or neutral.
PNP Switch	Transmission not in Park/Neutral	In Gear
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 whether 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	This parameter displays one of the last eight reasons that powertrain has disabled remote vehicle start (RVS).
Short Term FT Bank 1 or Bank 2	--	-3% to +3%	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.
Starter Relay Command	Ignition switch in the crank position	On
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.
Stoplamp Pedal Switch	Brake pedal fully actuated	Applied
System Power Mode	--	Run	This parameter displays the position of the ignition switch.
TAC System Learned Counts	--	0	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	--	No	This parameter displays whether or not the controller has responded to a request for a torque increase.
TCS Torque Increase	--	No	This parameter displays whether or not the controller has responded to a request for a torque increase.
TCS Torque Reduction Active	--	No	This parameter displays whether the transmission control module (TCM) is reducing torque.
TCM Torque Reduction Active	--	No	This parameter displays whether EBTCM has determined a reduction in torque took place.
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.
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 Misfire Count	--	0	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 information from the two TP sensors.
TP Sensor 1	--	0.5-0.8 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	--	0-0.6 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	--	4.7-4.1 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	--	5.0-3.7 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.
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.
Volumetric Efficiency	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 Disable Until Ign. Off	--	No	This parameter indicates the VTD system has disabled fuel for the remainder of the ignition cycle.
VTD Password learned	--	Yes	This parameter 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.

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 you select OFF. The relay remains de-energized until you select ON.

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

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 PCM 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

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 PCM 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

Important: 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

Important: 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

Important: 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

Important: 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

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 Pump Relay

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 Reset

This function resets the fuel trim data and the learned values for the rear heated oxygen sensors.

Generator L-Terminal

Commands the generator L terminal On and Off.

HO2S Htr. Bn. 1 or 2 Sen. 1 or 2 Command

Commands HO2S heater ON, 0-100 percent in 10 percent increments while the engine is running.

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.

IMRC Solenoid, If Equipped

This function controls the intake manifold runner control (IMRC) 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%.

Spark Retard

Controls the amount of spark retard. The scan tool will command an increase or decrease in the amount of spark retard in 1 degree increments, within a range of 1-10 degrees. The degrees of spark retard will remain in the commanded state until cancelled by the scan tool. The normal commanded states is NONE.

Starter Relay

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 3.4L

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

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

Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Engine Controls for diagnosis.

Engine Control Module Scan Tool Data Parameters

Parameter

System State

Expected Value

Description

Base Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off/Brake Pedal Released

5-Volt Reference 1

5.0 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

5.0 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 Disengage 1-8 History

Varies

This parameter indicates the reason the A/C compressor was disengaged. The reasons displayed are: None, A/C Pressure, Eng Spd, Batt Voltage, Stall Prevention, RPM Unstable, WOT, Launch Perf, Coolant Hot.

A/C High Side Pressure

1.43 Volts Varies

The scan tool displays 0-5 volts. This is the output of the A/C refrigerant pressure sensor.

A/C On

2.39 Volts Varies

A/C High Side Pressure

868 kPa / 125 psi Varies

The scan tool displays -103 to +3,119 kPa (-14 to +452 psi). This is the A/C refrigerant pressure sensor voltage signal converted to pressure.

A/C On

1568 kPa / 227 psi Varies

A/C Off for WOT

This parameter indicates if the A/C system was commanded off for a wide open throttle event.

A/C Pressure Disable

The scan tool displays Yes or No. Yes is displayed when the system pressure exceeds 3,034 kPa (440 psi).

A/C Relay Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the A/C Relay 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 a short to ground on the circuit.

A/C Relay Ckt Open Test Status

A/C Relay Ckt Short Volts Test Status

A/C Relay Command

Off

The scan tool displays ON or OFF. ON is displayed when the ECM has energized the A/C compressor clutch relay.

With A/C Selected

A/C Relay Request Signal

The scan tool displays Yes or No. Yes is displayed when the HVAC control module is requesting A/C operation.

With A/C Selected

Yes

Air Flow Calculated

3-6 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).

Ambient Air Temperature

Varies

Outside temperature at any given altitude expressed in degrees centigrade (°C) and Fahrenheit (°F).

APP Indicated Angle

Accelerator pedal not actuated

This parameter displays the angle, in percent, 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 fully actuated

100%

APP Sensors

This parameter displays the average of the accelerator pedal position (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 percent.

APP Sensor 1

Accelerator pedal not actuated

1.04 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

4.27 Volts

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.

APP Sensor 1 Indicated Position

Accelerator pedal not actuated

This parameter displays the position 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

0.47 V

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

2.10 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%

BARO

60-104 kPa (varies with altitude)

This parameter displays the barometric pressure as calculated by the control module using the signal from the manifold absolute pressure (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 Circuit Signal

Released

The scan tool displays Applied or Released. This parameter shows the position of the brake pedal position sensor through the stop lamp switch signal circuit.

Brake pedal depressed

Applied

BPP Signal

Released

The scan tool displays Applied, Released, or Invalid. This parameter shows the position of the brake pedal position sensor through the serial data bus.

Brake pedal depressed

Applied

Calc. TWC Temp.

446°C / 834°F Varies

Calculated catalytic converter temperature.

Catalyst Monitor Complete This Ignition

Varies

This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No

Catalyst Monitor Enabled This Ignition

Varies

This parameter displays the enable status during the current driving / monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

Catalytic Converter Protection Active

This parameter displays the state of the Catalytic Converter Protection mode.

Change Engine Oil Indicator Command

Off

The scan tool displays ON or OFF. This is the state of the Change Engine Oil indicator as commanded by the ECM.

CKP Active Counter

0-255 Counts incrementing

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

CKP Resync Counter

0 Counts

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

CKP Sensor

Same as Engine Speed

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

Cmmd. A/F Equivalence Ratio

1.0:1

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 Active Counter

0-255 Counts incrementing

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

CMP Sensor

Same as Engine Speed

This parameter displays the speed of the engine as calculated by 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 shows the power mode status of the starter motor. When Yes is displayed, a request to engage the starter has been received by the ECM.

Ignition switch in the crank position

Yes

Cruise Disengage 1-8 History

Varies

These parameters indicate the last 8 reasons the ECM disengaged the cruise control. Reason 1 contains the most recent reason. The reasons include the following: Brake Pedal Initialize, Cancel, Clutch, Coast Disengage, Coast Speed Low, TAC Inhibit, Accel Rate, Decel Rate, High Speed, Illegal Mode, Low Speed, None, Cruise Sw OFF, Over Set Speed, S/C On Speed Hi, ECM Inhibit, Simul S/C-R/A, TCS, Under Set Speed, DLC Override, Memory DTC, Eng Run Time, Engine Speed, DTC Set, RPM Limit, First Gear, APP Override, Low Voltage, D Whl Spd Low, D Whl Spd Hi, Cruise S/S, Cruise Sw Data, ECT Overtemp, VSES, Trans. DTC, BPP Data, BPP DTC, Park Brake, ACC Inhibit, ACC Brake DTC, ACC Option, ACC Brake Inop, PTO Active.

Cruise Cancel Switch

Inactive

The scan tool displays Active or Inactive. This is the state of the switch as monitored by the body control module (BCM).

Switch pressed

Active

Cruise Control Active

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 On/Off Switch

Off

The scan tool displays ON or OFF. This is the state of the switch as monitored by the body control module (BCM).

Switch pressed

Cruise Resume/Accel. Switch

Inactive

The scan tool displays Active or Inactive. This is the state of the switch as monitored by the body control module (BCM).

Switch pressed

Active

Cruise Set/Coast Switch

Inactive

The scan tool displays Active or Inactive. This is the state of the switch as monitored by the body control module (BCM).

Switch pressed

Active

Cycles of Misfire Data

0-100 Counts incrementing

This parameter displays the number of cylinder firing events that were recorded as misfires as determined by the control module.

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

This parameter displays the status of the output driver for the Fuel Injector 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 a short to ground on the circuit.

Cyl. 1-6 Inj. Ckt Open Test Status

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

Cyl. 1 and 4 IC Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the Ignition 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 a short to ground on the circuit.

Cyl. 1 and 4 IC Ckt Open Test Status

Cyl. 1 and 4 IC Ckt Short Volts Test Status

Cyl. 2 and 5 IC Ckt Short Gnd Test Status

Cyl. 2 and 5 IC Ckt Open Test Status

Cyl. 2 and 5 IC Ckt Short Volts Test Status

Cyl. 3 and 6 IC Ckt Short Gnd Test Status

Cyl. 3 and 6 IC Ckt Open Test Status

Cyl. 3 and 6 IC Ckt Short Volts Test Status

Decel. Fuel Cutoff

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

Scan tool displays volts or a range from 0-100 percent. Represents the exhaust gas recirculation (EGR) pintle position that the PCM is commanding. Desired EGR Position should stay close to EGR position sensor.

Desired Idle Speed

768 RPM

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

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.

EC Ign. Relay Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the Engine Control Ignition Relay 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 a short to ground on the circuit.

EC Ign. Relay Ckt Open Test Status

EC Ign. Relay Ckt Short Volts Test Status

EC Ignition Relay Feedback Signal

13.0-14.2 Volts

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.

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.

ECM in VTD Fail Enable

This parameter indicates Yes if a serial communication failure has been detected after the receipt of the correct vehicle theft deterrent (VTD) password. This indication is used to allow the vehicle to start on future ignition cycles in the presence of a serial communication failure.

ECT Sensor

96-103°C / 204-217°F

This parameter displays the temperature of the engine coolant based on the input from the engine coolant temperature 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

Scan tool range 0-255. Indicates the number of EGR flow test samples collected during the current ignition cycle. The maximum number of samples allowed is 1 during normal operation. If the PCM battery feed has been disconnected or a DTC P0401 has been cleared, several EGR flow test samples will be allowed during the next ignition cycle. This is to allow repair verification during a single ignition cycle.

EGR Learned Minimum Position

0.17 Volts

Scan tool range 0.0-5.0 volts. Represents the learned voltage that the PCM uses to determine whether or not the EGR valve is fully closed, 0 percent pintle position. If the Desired EGR Position is 0 percent and a difference of more than 0.4 volt between EGR Feedback and EGR Closed Valve Pintle Position is detected, the PCM will illuminate the MIL to indicate an EGR system fault.

EGR Monitor Complete This Ignition

This parameter displays the completion status during the current driving/monitoring cycle of the non continuous legislated emission related monitor. The states include: Yes or No.

EGR Monitor Enabled This Ignition

Yes

This parameter displays the enable status during the current driving/monitoring cycle of the non continuous legislated emission related monitor. The states include: Yes or No.

EGR Position Sensor

Scan tool range 0-100 percent. Represents the actual position of the EGR pintle in percent. 0 percent displayed indicates a fully extended pintle, the EGR valve is closed.

EGR Position Sensor

0.69 Volts

Scan tool range 0.00-5.00 volts. Indicates the EGR pintle position sensor signal voltage being monitored by the PCM. A low voltage indicates a fully extended pintle, closed valve, a voltage near 5 volts indicates a fully retracted pintle, open valve.

EGR Position Variance

Scan tool range 0-100 percent. Indicates the difference between Desired EGR Position and Actual EGR Position currently being monitored by the PCM. If the EGR Position Variance reaches an unacceptable level, the PCM will illuminate the MIL to indicate an EGR system fault.

EGR Solenoid Ckt Open Test Status

This parameter displays the status of the EGR solenoid 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.

EGR Solenoid Ckt Short Gnd Test Status

EGR Solenoid Ckt Short Volts Test Status

EGR Solenoid Command

This parameter indicates the commanded duty cycle for the exhaust gas recirculation (EGR) output.

Engine Load

Varies

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 Oil Pressure Switch

This parameter indicates the state of the engine oil pressure through a switch input to the ECM.

Engine Oil Life Remaining

Varies

This parameter indicates the percentage of time left before an oil change is necessary according to the oil life monitor.

Engine Oil Temperature Calculated

109°C/228°F Varies

This parameter displays the engine oil temperature.

Engine Off Time

Varies

This parameter displays the time elapsed since the engine was shut OFF.

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

750-800 RPM

This parameter displays the speed of the crankshaft as determined by the control module using an input from the crankshaft position (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

Varies

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.

Scan tool displays NO FAULT, EXCESS VACUUM, PURGE VALVE LEAK, SMALL LEAK, WEAK VACUUM, or NO TEST RESULT. The EVAP Fault History indicates the status of EVAP system diagnostics performed by the ECM.

EVAP Monitor Complete This Ignition

Varies

This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

EVAP Monitor Enabled This Ignition

Varies

This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

EVAP Purge Sol Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the EVAP Purge 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 a short to ground on the circuit.

EVAP Purge Sol Ckt Open Test Status

EVAP Purge Sol Ckt Short Volts Test Status

This parameter displays the status of the output driver for the fan EVAP Purge 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 a short to voltage on the circuit.

EVAP Purge Solenoid Command

10-15% Varies

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 Vent Sol Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the EVAP Vent 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 a short to ground on the circuit.

EVAP Vent Sol Ckt Open Test Status

EVAP Vent Sol Ckt Short Volts Test Status

This parameter displays the status of the output driver for the fan EVAP Vent 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 a short to voltage on the circuit.

EVAP Vent Solenoid Command

Venting

This parameter displays the state of the EVAP vent solenoid commanded by the control module expressed as a Venting or Not Venting. The scan tool will display a 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.

Ext. Travel BPP Signal

Released

This parameter displays Applied, Released, or Invalid. A state of Applied indicates the brake pedal position sensor has traveled beyond a moderate, extended threshold as determined by the brake sensing module and received over serial data.

Brake pedal firmly applied

Applied

FC Relay 1 Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the fan control relay 1 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 a short to ground on the circuit.

FC Relay 1 Ckt Open Test Status

FC Relay 1 Ckt Short Volts Test Status

FC Relay 1 Command

This parameter displays ON or OFF. This indicates the commanded state of the relay by the ECM.

FC Relay 2 and 3 Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the fan control relay 2 & 3 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 a short to ground on the circuit.

FC Relay 2 and 3 Ckt Open Test Status

FC Relay 2 and 3 Ckt Short Volts Test Status

FC Relay 2 and 3 Command

Off

This parameter displays ON or OFF. This indicates the commanded state of the relay by the ECM.

Fuel Level Sensor

Varies

This parameter displays the approximate fuel level in the fuel tank as a voltage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full.

Fuel Pump Relay Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the fuel pump relay 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 a short to ground on the circuit.

Fuel Pump Relay Ckt Open Test Status

Fuel Pump Relay Ckt Short Volts Test Status

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 Tank Level Remaining

Varies

This parameter displays the amount of fuel remaining in the fuel tank as a percentage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full.

Fuel Tank Pressure Sensor

-19.8 to +12.52 mm Hg/-10.5 to +6.17 in H2O

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 Pressure Sensor

0.2-4.0 V

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 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.

Fuel Tank Rated Capacity

Varies

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.

Fuel Trim Cell

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 indicates 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

Varies

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

45% Varies with electrical load

This parameter is an ECM input of the generator field duty cycle. This is an indication of generator load on the engine.

GEN L-Terminal Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the generator L-terminal 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 a short to ground on the circuit.

GEN L-Terminal Ckt Open Test Status

GEN L-Terminal Ckt Short Volts Test Status

GEN L-Terminal Command

65% Varies with electrical load

The scan tool displays 0-100 percent. The scan tool displays the percentage of the output voltage of the generator.

GEN L-Terminal Signal Command

This parameter indicates the commanded state of the generator-L terminal output. The output is considered to be commanded ON if its duty cycle is not zero.

HO2S Heater Monitor Complete This Ignition

Varies

This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

HO2S Heater Monitor Enabled This Ignition

Varies

This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

HO2S / O2S Monitor Complete This Ignition

Varies

This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

HO2S / O2S Monitor Enabled This Ignition

Varies

This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include: Yes or No.

HO2S 1

50-950 mV and Varying

The scan tool displays a range of 0-1,106 mV. The HO2S 1 parameter represents the exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10 mV , and 1,000 mV, while operating in Closed Loop.

HO2S 1 Heater

0.76 Amps

This parameter displays the current through the control module when the HO2S heater is commanded ON by the control module. HO2S Heater 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 1 Heater Command

Varies

This parameter displays the commanded state of the HO2S heater by the control module. The scan tool will display a higher percentage as the heater command is increased, and a lower percentage if the heater is not commanded ON.

HO2S 1 Heater Command

This parameter displays the commanded state of the HO2S heater by the control module. The scan tool will display On as the heater is commanded on, and Off if the heater is not commanded ON.

HO2S 1 Htr Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the HO2S Heater 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 a short to ground on the circuit.

HO2S 1 Htr Ckt Open Test Status

HO2S 1 Htr Ckt Short Volts Test Status

HO2S 2

50-850 mV and Varying

The scan tool displays a range of 0-1,106 mV. The HO2S bank 2 parameter represents the exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10 mV , and 1,000 mV, while operating in Closed Loop.

HO2S 2 Heater

0.76 Amps

This parameter displays the current through the control module when the HO2S heater is commanded ON by the control module. HO2S Heater Sen. 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 2 Heater Command

Varies

HO2S 2 Heater Command

This parameter displays the commanded state of the HO2S heater by the control module. The scan tool will display On as the heater is commanded on, and Off if the heater is not commanded ON.

HO2S 2 Htr Ckt Short Gnd Test Status

HO2S 2 Htr Ckt Open Test Status

HO2S 2 Htr Ckt Short Volts Test Status

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

•	The scan tool displays °C/F.

•	The ECM converts the resistance of the intake air temperature (IAT) sensor to degrees in the same manner as the engine coolant temperature (ECT) sensor. Intake air temp is used by the ECM to adjust fuel delivery and spark timing according to incoming air density.

•	The scan tool displays a range of -39 to +140°C (-38 to +284°F). The ECM converts the resistance of the intake air temperature sensor to degrees. The ECM uses the IAT in order to adjust fuel delivery and spark timing according to incoming air density.

Ignition 1 Signal

13-14.2 Volts

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.

Ignition Accessory Signal

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.

Inj. 1-6 Disabled Due to Misfire

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.

Injector PWM

1.55-1.85 ms

•	The scan tool displays mS

•	Indicates the base PWM or ON time of the fuel injectors in milliseconds. When the engine load is increased, the injector pulse width will increase.

•	Indicates the amount of time the PCM is commanding each injector ON during each engine cycle. A longer injector pulse width will cause more fuel to be delivered. Injector pulse width should increase with increased engine load.

Intake Manifold Pressure

Varies

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 high load cruising.

Knock Detected Cyl. 1-6

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

0 Degrees

The scan tool displays °.

Indicates the amount of spark the PCM is removing from ignition control (IC) spark advance in response to the signal from the knock sensors. The traction control system desired torque signal from the electronic brake and traction control module (EBTCM) may cause knock retard to display a value more than 0.0 degrees if traction control is active.

Long Term FT

-10-10%

The scan tool range is -99 to +99 percent. This parameter indicates the Long Term fuel trim (FT) correction for bank 1 as commanded by the PCM.

A change made to the fuel delivery will be indicated by the Long and Short Term FT values. The Short Term FT values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term FT values change in response to the trends in the Short Term FT. The Long Term FT makes coarse adjustments to the fueling in order to re-center and restore control to the Short Term FT. The Short Term FT and the Long Term FT can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

Loop Status

Closed

Closed loop indicates that the PCM is controlling fuel delivery according to oxygen sensor voltage. In open loop, the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on throttle position (TP) sensor, ECT, and MAF sensor inputs only.

Low EOP Indicator Command

Off

The scan tool displays ON or OFF. This is the state of the low engine oil pressure indicator as monitored by the ECM.

LT FT Test Avg.

0.68%

This parameter is the average long term fuel trim for this bank as calculated by the control module. The scan tool will display a value more than 0 percent indicating that time is being added to the injector pulse width, increasing the amount of fuel to this bank of the engine. The scan tool will display a value of less than 0, indicating time is being subtracted from the injector pulse width, reducing the amount of fuel to this bank of the engine. A value of 0 percent indicates no compensation is required to operate the engine at the desired air/fuel ratio.

LT FT Test Avg. w/o purge

1.02%

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% 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

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

3-6 g/s (varies with altitude)

The scan tool displays g/s

The scan tool displays a range of 0.0-655 g/s. The mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine.

MAF Sensor

1,200-1,300 Hz (varies with altitude)

The scan tool displays a range of 0-31,999 Hz. The MAF sensor is a hot wire type air flow sensor. The ECM converts current draw needed by the MAF to keep the hot wires at a constant into a frequency signal. The scan tool displays this frequency in a hertz signal.

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

20-48 kPa (varies with altitude)

•	The scan tool displays kPa.

•	The MAP sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required.

•	The scan tool displays a range of 10-105 kPa. The MAP sensor measures the absolute pressure in the intake manifold.

MAP Sensor

0.4-2.0 V (varies with altitude)

•	The scan tool displays Volts.

•	The MAP sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required.

•	The scan tool displays a range of 10-105 kPa. The MAP sensor measures the absolute pressure in the intake manifold.

MIL Ckt Short Gnd Test Status

This parameter displays the status of the output driver for the malfunction indicator lamp 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 a short to ground on the circuit.

MIL Ckt Open Test Status

MIL Ckt Short Volts Test Status

MIL Command

Off

This parameter displays the commanded state of the MIL control circuit. The malfunction indicator lamp 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

This parameter shows if the illumination of the MIL has been requested by a failed diagnostic trouble code (DTC).

Misfire Current Cyl. 1-6

0 Counts

The scan tool displays 0-255 counts. The display shows the number of misfires that have been detected during the last 200 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

0 Counts

The scan tool range is 0-255 counts. This parameter indicates 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 or DTC P0300 has become active. The misfire history counter will update every 200 cylinder firing events.

PNP Switch

Park/Neutral

The scan tool displays the position of the transmission selection as Park/Neutral or In Gear.

Power Enrichment

Inactive

Scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Power Enrichment mode. The PCM will command Power Enrichment mode when a large increase in throttle position and load is detected. While in Power Enrichment, the PCM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done to prevent a possible sag or hesitation from occurring during acceleration.

Output Shaft Speed Sensor

0 RPM

The parameter shows the transmission output speed, the speed at the output of the gear box, determined from the speed measured by the transmission output speed (TOS) sensor with the application of the factors to account for the location of the sensor, e.g. after the gear box, after the final chain, after the transfer case, after the final drive, etc. In applications that include both a transmission output speed sensor and a transfer case speed sensor, this parameter will apply specifically to the output of the transmission.

Reduced Engine Power

Inactive

The scan tool displays Active or Inactive. The scan tool displays Active when the PCM receives a signal from the TAC module that a throttle actuator control system fault is occurring. The PCM limits the engine power.

RVS Disable 1-8 History

Varies

These parameters show the last 8 reasons the ECM disabled remote vehicle start (RVS). Reason 1 is the most current reason.

RVS Request Signal

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.

Short Term FT

-10-10%

The Short Term FT values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term FT values change in response to the trends in the Short Term FT. The Long Term FT makes coarse adjustments to the fueling in order to re-center and restore control to the Short Term FT. The Short Term FT and the Long Term FT can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition.

Spark

18-24 Degrees

The scan tool displays a range of -64 to +64°. The scan tool displays the amount of degrees the PCM commands. The PCM computes the desired spark advance using the following: (1) ECT, (2) engine speed (RPM), (3) load, (4) vehicle speed. The PCM adjusts the timing.

A negative (-) value indicates degrees before top dead center (BTDC) or spark advance; a positive value indicates degrees after top dead center (ATDC) or spark retard.

ST FT Test Avg.

0.98-1.00%

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. 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

This parameter displays the status of the output driver for the starter relay 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 a short to ground on the circuit.

Starter Relay Ckt Open Test Status

Starter Relay Ckt Short Volts Test Status

Starter Relay Command

Off

The scan tool displays ON or OFF. This displays the commanded state of the starter relay by the ECM.

Ignition switch in the crank position

Start-up ECT

Varies

•	Indicates the engine coolant temperature at engine start up.

•	The scan tool displays a range of -39 to +140°C (-38 to +284°F). The scan tool displays the engine ECT at the time the engine was started. The PCM uses start-up ECT for certain DTCs.

•	Indicates the engine coolant temperature at the time that the vehicle was started. Used to determine if the last startup was a cold start.

Start-up IAT

Varies

Indicates the IAT at the time that the vehicle was started. Used to determine if the last startup was a cold start.

The scan tool range is -39 to 140°C (-38 to 284°F). This parameter indicates the ambient air temperature at start-up.

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.

TFT Sensor, If Equipped

Varies

This parameter indicates the transmission fluid temperature measured by a sensor. In automatic transmission applications, this is based upon the transmission fluid temperature sensor input to the TCM. In manual transmission applications with a transmission fluid temperature sensor, this is based upon the transmission fluid temperature sensor input to the ECM.

Torque Delivered Signal

2-6 ft-lbs

Represents the PWM signal which indicates the available torque the engine is delivering to the drive wheels. The EBTCM monitors the Traction Control Torque signal to ensure that the ECM is responding properly to the Traction Control Desired Torque signal.

Torque Management Spark

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 Degrees

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

0 Counts

TP Desired Angle

The scan tool displays %. The scan tool displays 0-100 percent. The PCM indicates the desired throttle angle commanded by the vehicle operator. The scan tool indicates the desired throttle angle commanded by the vehicle operator.

With Ignition On, Engine Off, Accelerator pedal not actuated

11%

With Ignition On, Engine Off, Accelerator pedal fully actuated

100%

TP Indicated Angle

This parameter displays the angle of the TP in percent. This information is calculated by the control module using the signals from the throttle position sensors. The scan tool will display a low percentage when the throttle plates are closed. The scan tool will display a high percentage when the throttle plates are fully open.

With Ignition On, Engine Off, Accelerator pedal not actuated

29%

With Ignition On, Engine Off, Accelerator pedal fully actuated

100%

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

4.06 Volts

This parameter displays the voltage signal sent to the control module from the sensor used to monitor the position of the throttle plates. This parameter is for sensor 1 of the TP sensor assembly. The scan tool will display a high voltage when the throttle plates are at rest. The scan tool will display a low voltage when the throttle plates are fully open.

With Ignition On, Engine Off, Accelerator pedal not actuated

3.27 Volts

With Ignition On, Engine Off, Accelerator pedal fully actuated

0.80 Volts

TP Sensor 1 Indicated Position

This parameter displays the angle of the TP sensor 1 in percent. This information is calculated by the control module using the signal from the throttle position sensor 1. The scan tool will display a low percentage when the throttle plates are closed. The scan tool will display a high percentage when the throttle plates are fully open.

With Ignition On, Engine Off, Accelerator pedal not actuated

29%

With Ignition On, Engine Off, Accelerator pedal fully actuated

100%

TP Sensor 1 Learned Minimum

0.69 Volts

This parameter displays the learned minimum voltage for TP sensor 1 as determined by the control module this ignition cycle.

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 when the signal from TP sensor 1 corresponds with the signal from TP sensor 2. The scan tool will display Disagree when the signal from TP sensor 1 conflicts with the signal from TP sensor 2.

TP Sensor 2

0.90 Volts

This parameter displays the voltage signal sent to the control module from the sensor used to monitor the position of the throttle plates. This parameter is for sensor 2 of the TP sensor assembly. The scan tool will display a low voltage when the throttle plates are at rest. The scan tool will display a high voltage when the throttle plates are fully open.

With Ignition On, Engine Off, Accelerator pedal not actuated

1.69 Volts

With Ignition On, Engine Off, Accelerator pedal fully actuated

4.16 Volts

TP Sensor 2 Indicated Position

This parameter displays the angle of the TP sensor 2 in percent. This information is calculated by the control module using the signal from the throttle position sensor 2. The scan tool will display a low percentage when the throttle plates are closed. The scan tool will display a high percentage when the throttle plates are fully open.

With Ignition On, Engine Off, Accelerator pedal not actuated

28%

With Ignition On, Engine Off, Accelerator pedal fully actuated

100%

TP Sensor 2 Learned Minimum

0.69 Volts

This parameter displays the learned minimum voltage for TP sensor 2 as determined by the control module this ignition cycle.

TWC Mon. Bank 1 Test Count

Varies

This parameter indicates the number of iterations of the catalyst monitor diagnostic test have been performed since a code clear for bank 1. It is used to determine if a sufficient number of tests have run to report a passing condition.

TWC Mon. Bank 1 Test Result

No Result

This parameter indicates the status of the catalyst monitor diagnostic for bank 1. Multiple tests may run before the diagnostic reports a Passed or Failed. When a determination has been made, the diagnostic is complete for the current trip and will not attempt any further tests on bank 1.

TWC Mon. Bank 2 Test Count

Varies

This parameter indicates the number of iterations of the catalyst monitor diagnostic test that have been performed since a code clear for bank 2. It is used to determine if a sufficient number of tests have run to report a passing condition.

TWC Mon. Bank 2 Test Result

No Result

This parameter indicates the status of the catalyst monitor diagnostic for bank 2. Multiple tests may run before the diagnostic reports a Passed or Failed. When a determination has been made, the diagnostic is complete for the current trip and will not attempt any further tests on bank 2.

TWC Mon. Off Idle Test Conditions Met

This parameter indicates if the off idle conditions for the catalyst monitor diagnostic have been met. Once the Off Idle Conditions Met, Yes is displayed, the vehicle can return to idle and allow the catalyst monitor diagnostic test to run.

TWC Monitor Test State

Inactive

This parameter indicates when the catalyst monitor diagnostic is actively running a test. This condition will only be true when the vehicle is at idle.

Vehicle Speed Ckt 2 Open Test Status

This parameter displays the status of the vehicle speed 2 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.

Vehicle Speed Ckt 2 Short Gnd Test Status

Vehicle Speed Ckt 2 Short Volts Test Status

Vehicle Speed Sensor

0 km/h/mph

The scan tool range is 0-200 km/h (0-125 mph). This parameter displays the vehicle speed. The PCM receives reference pulses from the vehicle speed sensor (VSS) and converts them into km/h and mph for display.

VTD Auto Learn Timer

0 Seconds

This parameter indicates the time elapsed within the current auto-learn cycle within the immobilizer system.

VTD Fuel Disable

Inactive

This parameter indicates Yes if the vehicle theft deterrent (VTD) system has disabled fuel.

VTD Fuel Disable Until Ign. Off

This parameter indicates Yes if the vehicle theft deterrent (VTD) system has disabled fuel for the remainder of the ignition cycle.

VTD Fuel Enabled

Yes

This parameter indicates Yes if the vehicle theft deterrent (VTD) system has decided not to disable fuel for the remainder of the ignition cycle based upon the receipt of the correct VTD password.

VTD Password Learned

Yes

This parameter indicated Yes if learning of the vehicle theft deterrent (VTD) password received from the platform electronics is enabled. VTD password learning is initially enabled in the assembly plant, and may be re-enabled via either the auto learn procedure or the seed and key procedure.

Warm-ups w/o Emission Faults

The scan tool displays a range of 0-255. This parameter counts the number of warm up cycles without an emission fault present. The counter increments to 255 and rolls back to 0 unless a fault occurs. If a fault occurs, the counter reverts back to 0 until the fault is corrected. Clearing the information with a scan tool or a loss of power to the PCM also resets the counter to 0. The scan tool displays counts. This display indicates the number of warm-up cycles without a emission failure.

Warm-ups w/o Non-Emission Faults

The scan tool displays a range of 0-255. This parameter counts the number of warm up cycles without a non-emission fault present. The counter increments to 255 and rolls back to 0 unless a fault occurs. If a fault occurs, the counter reverts back to 0 until the fault is corrected. Clearing information with a scan tool or a loss of power to the PCM also resets the counter to 0.

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%.

Engine Control Module Scan Tool Output Controls

Output Control

Description

A/C Relay

The commanded states are ON or OFF. The command turns the A/C relay ON or OFF, which engages or disengages the A/C compressor clutch.

Crankshaft Pos. Variation Learn

This output control is used to activate the crankshaft position variation learn (CASE) algorithm which calculates the reference pulse correction factors for the misfire diagnostic.

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:

•	All the instructions on the scan tool have been completed.

•	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.

EGR Solenoid

Activates the exhaust gas recirculation (EGR) solenoid in 10 percent increments from 0 to 100 percent or a maximum of 30 seconds at 100 percent.

Engine Controls Ignition Relay

Activates the Engine Controls Ignition Relay. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool.

Engine Speed Control

Activates the throttle activation control (TAC) system 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 RPM within a range of 500-1,950 RPM. The set step value changes the RPM by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the scan tool.

EVAP Purge/Seal

Simultaneously activates the purge solenoid in 10 percent increments from 0 to 100 percent and the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds -22 mm Hg (-11 in H2O).

EVAP Purge Solenoid

Activates the purge solenoid in 10 percent increments from 0 to 100 percent. The device control will be aborted and inhibited if the fuel tank pressure (FTP) sensor exceeds -22 mm Hg (-11 in H2O).

EVAP Service Bay Test

Activates the on-board EVAP diagnostic test.

EVAP Vent Solenoid

Activates the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds -22 mm Hg (-11 in H2O).

Fan Relay 1

The scan tool displays a commanded state of OFF or ON. This allows you to communicate with the ECM and activate or deactivate the cooling fan 1 relay, manually turning both low speed fans ON and OFF.

Fan Relay 2 & 3

The scan tool displays a commanded state of OFF or ON. This allows you to activate or deactivate the cooling fan series/parallel relay and the cooling fan 2 relay. The RH cooling fan 2 turns ON and OFF in high speed.

Fan Relays 1, 2, & 3

The scan tool displays a commanded state of OFF or ON. This allows you to activate or deactivate all of the cooling fan relays. Both cooling fans turn ON and OFF in 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

Activates the fuel pump relay for 2 seconds. Also turns fuel pump ON and OFF while engine is running.

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 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.

HO2S Heater Sensor 1

Commands the heated oxygen sensor (HO2S) heater from 0-100 percent in 10 percent increments. The normal state is NONE. The system remains in the commanded state until cancelled by the tool or the heaters exceed a maximum temperature.

HO2S Heater Sensor 2

Idle Learn Reset

This output control is used to reset the learned airflow adaptive values to their initial values.

Idle Spark

Disables and enables idle spark advance with the engine running.

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

Activates the malfunction indicator lamp (MIL). The commanded states include ON and OFF. The normal state is NONE. The MIL will remain illuminated 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.

Oil Life Reset

The engine oil remaining life is determined from an algorithm based upon the effective engine revolutions and the distance driven since the last oil change. This output control may be used to reset the engine oil remaining life.

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).

Spark Retard

Controls the amount of spark retard. The scan tool will command an increase or decrease in the amount of spark retard in 1 degree increments, within a range of 1-10 degrees. The normal commanded state is none.

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

Operates TAC motor in from 0-100 percent in 10 percent increments to open or close the throttle blade. The test operates during key ON, engine OFF.