The Engine Scan Tool Data Definitions contains a brief description of all engine related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.

5-Volt Reference 1: The scan tool displays OK or Fault. This parameter indicates the state of the 5-volt reference A circuit. This circuit supplies the reference voltage to the throttle position (TP) sensor , manifold absolute pressure (MAP) sensor , and exhaust gas recirculation (EGR) pintle position sensor .

5-Volt Reference 2: The scan tool displays OK or Fault. This parameter indicates the state of the 5-volt reference B circuit. This circuit supplies the reference voltage to the A/C pressure sensor , and the fuel tank pressure (FTP) sensor .

12-Volt Reference: The scan tool displays OK or Fault. This parameter indicates the state of the IGN 1 input to the powertrain control module (PCM).

24X Crank Sensor : The scan tool displays RPM. This parameter displays engine speed based on the correlation of crankshaft position (CKP) sensor A and B signals.

A/C High Side Pressure: The scan tool range is 0.00-5.00 volts. This parameter indicates the A/C high side pressure sensor input to the powertrain control module (PCM).

A/C Relay Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the A/C relay control circuit.

Air Fuel Ratio: The scan tool displays the powertrain control module (PCM) commanded air to fuel. Air fuel ratio should normally be around 14.2:1-14.7:1. A lower air fuel ratio indicates a richer air to fuel mixture. A higher air fuel ratio indicates a leaner commanded air to fuel mixture.

AIR Pump Relay Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the secondary air injection (AIR) pump relays.

AIR Solenoid Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the secondary air injection (AIR) vacuum solenoid.

BARO: The scan tool range is 10-105 kPa. The barometric pressure (BARO) reading is determined from the manifold absolute pressure (MAP) sensor signal. The powertrain control module (PCM) monitors the MAP signal during key up and wide-open throttle (WOT) conditions. The BARO compensates for altitude differences.

CKP Sensor Status: The scan tool displays Angle, Time A, or Time B. This parameter indicates the engine position sensing mode. With both crankshaft position (CKP) sensors A and B working properly, this parameter should display Angle. If the powertrain control module (PCM) detects an incorrect condition with CKP sensor A, the PCM will command TIME B mode. If the PCM detects an incorrect condition with CKP sensor B, the PCM will command Time A mode.

CMP Sensor: The scan tool displays 0-16,384 RPM. This parameter indicates engine speed as calculated from the camshaft position (CMP) sensor signal.

CMP Sensor Signal Present: The scan tool displays Yes/No.

Crank Request Signal: The scan tool displays Yes or No. Yes is displayed when the key is in the Crank position.

Cruise Control Active: The scan tool displays Yes or No.

Cruise Inhibited Signal Command: The scan tool displays On or Off. On displayed indicates that the powertrain control module (PCM) is commanding the stepper motor cruise control (SMCC) module to inhibit cruise control operation.

Current Gear: The scan tool displays the numbers 1, 2, 3, or 4. The powertrain control module (PCM) looks at trans range position and the gear commanded by the PCM. The actual forward gear that the transaxle is in will be the lower of the two because the manual valve can override the PCM commanded gear. The scan tool displays which gear the transmission is in.

Cycles of Misfire Data: The scan tool range is 0-100. The parameter indicates which engine cycle of the 100 engine cycle test the powertrain control module (PCM) is collecting misfire data.

Desired EGR Position: The scan tool range is 0-100 percent . The parameter indicates the powertrain control module (PCM) commanded EGR pintle position. The desired EGR position should stay close to actual EGR position.

Desired Idle Speed: The scan tool range is 0-3187 RPM. The powertrain control module (PCM) commands the desired idle speed. The PCM compensates for various engine loads based on engine coolant temperature in order to keep the engine at the desired speed.

ECT Sensor: The scan tool range is -40 to +150°C (-40 to +302°F). This parameter indicates the engine coolant temperature (ECT) based on input from the (ECT) sensor.

EGR Position Sensor: The scan tool range is 0-100 percent/0-5 volts. Represents the actual position of the exhaust gas recirculation (EGR) pintle in percent. Zero percent displayed indicates a fully extended pintle (EGR valve closed).

Engine Load: The scan tool range is 0-100 percent . This parameter indicates the calculated engine load based on engine speed, and mass air flow (MAF) sensor readings. The engine load increases with an increase in RPM or airflow.

Engine Oil Level Switch: The scan tool displays OK or Low. The parameter displays Low if the engine oil level remains low (about 1 quart or more) for a sufficient period of time.

Engine Oil Pressure Switch: The scan tool displays OK or Low. This parameter displays whether or not sufficient engine oil pressure is present.

Engine Run Time: The scan tool displays Hours, Minutes, Seconds. This indicates the amount of engine run time. When the ignition is cycled OFF, the timer will reset to zero.

Engine Speed: The scan tool range is 0-16,384 RPM. This parameter indicates the engine speed calculated by the powertrain control module (PCM). The engine speed should remain close to desired idle under various engine loads with the engine idling.

EVAP Purge Solenoid Command: The scan tool range is 0-100 percent. This parameter indicates the powertrain control module (PCM) commanded duty cycle of the evaporative emission (EVAP) purge valve. A display of 0 percent indicates no purge while a display of 100  percent indicates full purge.

EVAP Test Abort Reason: The scan tool displays Not Aborted, Lost Enable, Small Leak, Veh. Not at Rest. This parameter indicates the reason the EVAP system test was aborted.

EVAP Test Result: The scan tool displays No Result, Aborted, Passed, Failed-DTC P0440, Failed-DTC P0442, Failed-DTC P0446, Failed-DTC P1441. This parameter indicates the results of the EVAP system tests.

EVAP Test State: The scan tool displays Wait For Purge, Test Running, Test Complete. This parameter indicates the state of the EVAP Service Bay Test.

EVAP Vent Solenoid Command: The scan tool displays Venting / Not Venting. This parameter indicates the powertrain control module (PCM) commanded state of the EVAP vent solenoid.

Extended Travel Brake Pedal Switch: The scan tool displays Applied or Released. This parameter indicates the extended travel brake switch input to the powertrain control module (PCM).

FC Relay 1 Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the low speed cooling fans.

FC Relay 2 and S/P Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the series parallel, and the cooling fan 1 relay.

Fuel Level: The scan tool displays Liters, Gallons. This parameter displays the volume of fuel in the tank based on input from the fuel level sensor .

Fuel Level Sensor: The scan tool displays 0-5 volts. This parameter displays the fuel level input to the powertrain control module (PCM).

Fuel Pump Relay Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the fuel pump relay control circuit.

Fuel Tank Pressure Sensor: The scan tool range -17.5 to +7.5 inches H2O (-33 to +14 mmHg) / 0 to 5 volts. This parameter indicates the fuel tank pressure (FTP) sensor input to the powertrain control module (PCM). The PCM uses the signal to determine the FTP. The PCM uses the FTP sensor input to determine the status of the EVAP system diagnostics.

Fuel Trim Cell: This parameter indicates the current fuel trim cell.

Generator F Terminal Signal: The scan tool displays 0-100 percent . This parameter indicates the generator field duty cycle as commanded by the voltage regulator. The powertrain control module (PCM) monitors the duty cycle using the generator F terminal circuit.

Generator L Terminal Signal Command: The scan tool displays ON / OFF. This parameter indicates the powertrain control module (PCM) commanded state of the generator L terminal. The PCM uses the L terminal to command the generator voltage regulator ON and OFF.

HO2S Bank 1 Sensor 1: The scan tool range is 0-1,275 mV (0-1.275 volts). This parameter indicates the output voltage for heated oxygen sensor (HO2S) bank 1 sensor 1 (rear bank fuel control oxygen sensor). The voltage should fluctuate constantly within a range between about 50 mV (lean exhaust) and 800 mV (rich exhaust) while operating in Closed Loop.

HO2S Bank 1 Sensor 2: The scan tool range is 0-1,275 mV (0-1.275 volts). This parameter indicates the output voltage for heated oxygen sensor (HO2S) bank 1 sensor 2 (post catalyst oxygen sensor). The voltage should fluctuate within a range between about 50 mV (lean exhaust) and 800 mV (rich exhaust) while operating in Closed Loop. The post-catalyst HO2S output voltage will fluctuate slowly over a longer period of time, compared to the fuel control oxygen sensors. This is due to the oxygen storage capacity of an efficiently operating catalyst.

HO2S Bank 2 Sensor 1: The scan tool range is 0-1,275 mV (0-1.275 volts). This parameter indicates the output voltage for HO2S bank 2 sensor 1 (front bank fuel control oxygen sensor). The voltage should fluctuate constantly within a range between about 50 mV (lean exhaust) and 800 mV (rich exhaust) while operating in Closed Loop.

IAC Position: The scan tool range is 0-255 counts. This parameter displays the powertrain control module (PCM) commanded position of the idle air control (IAC) pintle in counts. A larger number of counts indicates a retracted IAC valve which allows more air the idle air passage. The IAC position should respond quickly to changes in engine load in order to maintain the desired idle RPM.

IAT Sensor: The scan tool range is -40 to +150°C (-40 to +302°F). This parameter indicates the temperature of the intake air based on the signal voltage from the intake air temperature (IAT) sensor.

IMS: The scan tool displays Park, Park/Reverse, Reverse, Reverse/Neutral, Neutral, Neutral/Drive 4, Drive 4/Drive 3, Drive 3/Drive 2, Drive 2/Drive 1, Drive 1 or Invalid. This parameter is the decoded status of the four A/B/C/P inputs from the automatic transmission internal mode switch. If a valid combination of inputs is not received by the powertrain control module (PCM), Invalid will be displayed.

Ignition 0 Signal: The scan tool displays On or Off. This parameter indicates the state of the IGN 0 input to the powertrain control module (PCM).

Ignition 1 Signal: The scan tool range is 0-25.5 volts. This parameter indicates the system voltage detected by the powertrain control module (PCM).

Injector PWM Bank 1 AVG/Bank 2 AVG: This parameter indicates the average pulse width of the bank 1 and bank 2 injectors.

Knock Retard: The scan tool range 0-45 degrees. This parameter indicates the amount of timing retard commanded by the powertrain control module (PCM).

Long Term FT Avg. Bn1: The scan tool range is -99 to +99 percent . This parameter indicates the average Long Term FT correction for bank 1 calculated by the powertrain control module (PCM) during the current ignition cycle.

Long Term FT Avg Bn 2: The scan tool range is -99 to +99 percent . This parameter indicates the average Long Term FT correction for bank 2 calculated by the powertrain control module (PCM) during the current ignition cycle.

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

Long Term FT Bank 2: The scan tool range is -99 to +99 percent . This parameter indicates the Long Term FT correction for bank 2 as commanded by the powertrain control module (PCM).

Loop Status: The scan tool displays Open or Closed. This parameter indicates the state of the fuel control system. A CLOSED display indicates that the powertrain control module (PCM) is using the signals from the heated oxygen sensors to control the fuel system.

MAF Sensor: The scan tool range is 0-655 grams per second (g/s). This parameter indicates the volume of air entering the engine.

MAF Sensor: The scan tool range is 0-65535 Hz. This parameter indicates the mass air flow (MAF) sensor frequency based on the volume of air entering the engine. The powertrain control module (PCM) converts the signal frequency to grams per second (g/s).

MAP Sensor: The scan tool range is 10-105 kPa/0-5 volts. This parameter indicates the manifold absolute pressure (MAP) sensor input to the powertrain control module (PCM).

MIL Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the malfunction indicator lamp (MIL).

Mileage Since DTC Cleared: The scan tool range is 0-1,677,722. This parameter indicates the actual vehicle miles stored in the powertrain control module (PCM) since the DTCs were cleared.

Misfire Current #1 through #8: The scan tool range is 0-255 counts. This parameter indicates the possible misfires being detected on each cylinder during the last 2,000 cylinder firing events. The counters may normally display some activity, but the activity should be very low and equal for all cylinders.

Misfire History #1 through #8: 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.

Non-Driven Wheel Speed: The scan tool range is 0-255 km/h (0-158 mph). This parameter indicates the speed of the rear wheels. The powertrain control module (PCM) receives the information from the electronic brake and traction control module (EBTCM) via class 2 serial data.

Odometer: The scan tool range is 0-1,677,722. This parameter indicates the actual vehicle miles stored in the powertrain control module (PCM).

PCM / VCM in VTD Fail Enable: The scan tool will display Yes or No. This will indicate that the powertrain control module (PCM) has received the correct password from the Passlock® module and a failure has occurred. The PCM will continue to enable fuel.

Powertrain Induced Chassis Pitch Command: The scan tool displays Active or Inactive.

Short Term FT Avg Bn 1: The scan tool range is -99 to +99 percent . This parameter indicates the average Short Term FT correction for bank 1 calculated by the powertrain control module (PCM) during the current ignition cycle.

Short Term FT Avg Bn 2: The scan tool range is -99 to +99 percent . This parameter indicates the average Short Term FT correction for bank 2 calculated by the powertrain control module (PCM) during the current ignition cycle.

Short Term FT Bank 1: The scan tool range is -99 to +99 percent . This parameter indicates the Short Term FT correction for bank 1 as commanded by the powertrain control module (PCM).

Short Term FT Bank 2: The scan tool range is -99 to +99 percent . This parameter indicates the Short Term FT correction for bank 2 as commanded by the powertrain control module (PCM).

Spark: The scan tool range is 0-64 degrees. This parameter indicates the amount of spark advance commanded by the powertrain control module (PCM).

Start-up ECT: The scan tool range is -40 to +150°C (-40 to +302°F). This parameter indicates the engine coolant temperature (ECT) at start-up.

Start-up IAT: The scan tool range is -40 to +150°C (-40 to +302°F). This parameter indicates the ambient air temperature at start-up.

Starter Relay Command: The scan tool displays ON or OFF. This parameter indicates the powertrain control module (PCM) commanded state of the starter relay control circuit.

TCC Brake Pedal Switch: The scan tool displays Applied or Released. This parameter indicates the torque converter clutch (TCC) brake switch input to the powertrain control module (PCM).

TCC Duty Cycle: The scan tool range is 0-100 percent. This display indicates the commanded percent of torque converter clutch (TCC) pulse width modulation (PWM) solenoid ON time. A display of 90 percent represents a fully energized commanded state. A display of 0 percent represents a de-energized commanded state.

TCC Enable Solenoid Command: The scan tool displays On / Off. This display indicates the commanded state of the torque converter clutch (TCC) solenoid.

TFP Sw.: The scan tool displays Park/Neutral, Reverse, Drive, or Invalid. This display indicates the decoded status of the two A/B inputs from the automatic transmission fluid pressure manual valve position switch.

TP Sensor: The scan tool range is 0-100 percent . This parameter indicates the throttle angle calculated by the powertrain control module (PCM) from the throttle position (TP) sensor voltage input.

TP Sensor : The scan tool range is 0-5 volts. This parameter indicates the throttle position (TP) sensor voltage input to the powertrain control module (PCM).

Torque Delivered Signal: The scan tool displays 0-100 percent . This display indicates the amount of available engine torque.

Torque Request Signal: The scan tool displays 0-100  percent . This parameter indicates the amount of torque requested by the EBTCM.

Traction Control Status: The scan tool display Active / Inactive. This parameter indicates the status of the traction control system.

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

Vehicle Speed Sensor: The scan tool range is 0-255 km/h (0-158 mph). This parameter indicates the vehicle speed calculated by the powertrain control module (PCM) from the vehicle speed sensor (VSS) .

VTD Auto Learn Timer: The scan tool indicates ACTIVE or INACTIVE. This parameter indicates the status of the vehicle theft deterrent system password learn.

VTD Fuel Disable: The scan tool displays Active or Inactive. This parameter indicates the status of the theft deterrent fuel disable command.

VTD Password: The scan tool displays OK or Incorrect. This parameter indicates the validity of the vehicle theft deterrent (VTD) password.

Warm-ups w/o Emission Faults: The scan tool displays counts. This display indicates the number of warm-up cycles without an emission failure.

Warm-ups w/o Non-Emission Faults: The scan tool displays counts. This display indicates the number of warm-up cycles without a non-emission failure.