Part 1
Scan Tool Data Definitions
The Scan Tool Data Definitions list contains a brief description of all of the 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. 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.
A/C Disengage 1-8 History
- 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 Sensor
- This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module.
A/C High Side Pressure Sensor
- This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module.
A/C OFF for WOT
- 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
- This parameter displays whether the A/C pressure is out of range for normal operation as determined by the control module.
A/C Relay Circuit Status
- This parameter displays the state of the A/C clutch relay control circuit. The parameter displays Fault if the A/C clutch relay control circuit is open, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON.
This parameter may not change if the scan tool is used to command the A/C relay ON.
A/C Relay Command
- This parameter displays the state of the A/C clutch relay control circuit as commanded by the control module.
A/C Request Signal
- This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls.
APP Indicated Angle
- 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 Sensor 1
- This parameter displays the actual voltage on the APP sensor 1 signal circuit as measured by the control module.
APP Sensor 2
- This parameter displays the actual voltage on the APP sensor 2 signal circuit as measured by the control module.
APP Sensor 1 and 2
- 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.
BARO
- This parameter displays the barometric pressure. The control module uses the barometric pressure for fuel control to compensate for altitude differences.
BARO
- This parameter displays the barometric pressure voltage. The control module uses the barometric pressure for fuel control to compensate for altitude differences.
Brake Pedal Signal Status
- 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
- 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
- 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 or Bank 2
- This parameter displays the catalytic converter temperature as calculated by the control module.
Catalytic Converter Protection Active
- This parameter displays if the control module is commanding catalytic converter protection.
Catalyst Monitor Complete This Ignition
- This parameter displays the monitor completion status during the current driving/monitoring cycle.
Catalyst Monitor Enabled This Ignition
- This parameter displays the monitor enable status during the current driving/monitoring cycle.
CKP Resync Counter
- This parameter displays the number of times the control module re-syncs with the crankshaft position (CKP) sensor.
Clutch Start Switch (If Equipped)
- This parameter displays the state of the clutch pedal as determined by the control module from the clutch start switch.
Component Monitor Complete This Ignition
- This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
Component Monitor Enabled This Ignition
- This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
CPP Switch (If Equipped)
- This parameter displays the state of the clutch pedal as determined by the control module from the clutch pedal switch.
Crank Request
- This parameter displays whether the ignition switch has been cycled to the crank position requesting the control module to activate the starter relay.
Cruise Control Active
- This parameter displays the status of the cruise control system as determined by the control module.
Cruise Disengage 1-8 History
- 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 Inhibit Reason
- This parameter displays the reason that cruise is inhibited.
Cruise On/Off Switch
- This parameter displays the state of the cruise control on/off switch input to the control module.
Cruise Resume/Accel. Switch
- This parameter displays the state of the cruise controls resume/accel switch position input to the control module.
Cruise Set/Coast Switch
- This parameter displays the state of the cruise controls set/coast switch position input to the control module.
Current Gear
- This parameter displays the transmission gear commanded by the transmission control module.
Current Gear Signal
- This parameter displays Invalid if the serial data message from the transmission control module (TCM) is invalid.
Cycles of Misfire Data
- This parameter displays the number of misfire tests during 200 engine revolutions.
Cylinder 1-6 Injector Circuit Status
- This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is open, shorted to ground, or shorted to voltage.
This parameter displays indeterminate until the control circuit has been commanded ON.
Cylinder 1-6 Knock Retard
- 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
- This parameter displays the status of the operating mode of the control module used to turn off the fuel injectors and the evaporative emission (EVAP) canister purge valve during certain deceleration conditions.
Desired Exh. CMP Bank 1 or 2
- This parameter displays the desired exhaust camshaft angle as commanded by the control module.
Desired HO2S Bank 1 or 2 Sensor 1
- This parameter displays the desired heated oxygen sensor (HO2S) lambda value as commanded by the control module.
Desired Idle Speed
- This parameter displays the desired engine idle speed as commanded by the control module.
Desired Int. CMP Bank 1 or 2
- This parameter displays the desired intake camshaft angle as commanded by the control module.
DTC Set This Ignition
- This parameter displays Yes if a DTC set on the current ignition cycle.
EC Ignition Relay Command
- This parameter displays the state of the control circuit for control module power relay as commanded by the control module.
EC Ignition Relay Feedback Signal
- This parameter displays the voltage available at the EC ignition relay pin of the control module.
ECM Reset
- This parameter displays Yes when an internal control module reset occurs. The scan tool displays NO under normal operating conditions.
ECT Sensor
- 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
- This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors.
Engine Off EVAP Test Conditions Met
- This parameter displays Yes if the conditions for running the engine Off EVAP diagnostic are met.
Engine Off Time
- This parameter displays the amount of time that has elapsed since the engine was last cycled OFF.
Engine Oil Level Switch
- This parameter displays if the level of the engine oil is within range as determined by the control module from information received from the engine oil level switch.
Engine Oil Life Remaining
- 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
- This parameter displays OK if the engine oil pressure is within the correct range. If the control module detects that the engine oil pressure is not within the correct range, the scan tool displays Low.
Engine Oil Pressure Sensor
- This parameter displays the engine oil pressure.
Engine Oil Pressure Sensor
- This parameter displays the voltage signal received by the control module from the engine oil pressure (EOP) sensor.
Engine Run Time
- This parameter displays the time elapsed since the engine was started.
Engine Speed
- This parameter displays the speed of the engine crankshaft rotation from information received from the CKP sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors.
EVAP Monitor Complete This Ignition
- This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
EVAP Monitor Enabled This Ignition
- This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
EVAP Purge Solenoid Circuit Status
- This parameter displays the state of the EVAP purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is open, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON.
EVAP Purge Solenoid Command
- 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 Solenoid Circuit Status
- 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, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON. This parameter may not change if the scan tool is used to command the EVAP vent solenoid ON.
EVAP Vent Solenoid Command
- This parameter displays the state of the control circuit for EVAP vent solenoid as commanded by the control module.
Exh. CMP Angle Bank 1 or 2
- This parameter displays the actual exhaust camshaft position in degrees.
Exh. CMP Angle Bank 1 or 2 Variance
- This parameter displays in degrees, the difference between the desired exhaust camshaft position and the actual exhaust camshaft position.
Exh. CMP Bank 1 or 2 Command
- This parameter displays the exhaust camshaft position in percent of range as commanded by the control module.
Exh. CMP Solenoid Bn. 1 or 2 Circuit Status
- 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, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON.
Extended Travel Brake Pedal Switch
- This parameter displays the state of the brake pedal as determined by the control module from the extended travel brake pedal switch position.
FC Relay 1 Circuit Status
- This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON.
FC Relay 1 Command
- This parameter displays the control module commanded state of the fan relay control circuit.
FC Relay 2 and 3 Command
- This parameter displays the control module commanded state of the fan relay control circuit.
FC Relay 2 and 3 Circuit Status
- This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the relay control circuit has been commanded ON.
Fuel Level
- 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)
- This parameter displays the voltage signal received by the control module from the left or secondary fuel level sensor.
Fuel Level Sensor Right Tank (Primary)
- This parameter displays the voltage signal received by the control module from the right or primary fuel level sensor.
Fuel Pump Relay Circuit Status
- 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, shorted to ground, or shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON.
Fuel Pump Relay Command
- This parameter displays the control modules commanded state of the fuel pump relay control circuit.
Fuel Tank Level Remaining
- 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
- 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
- This parameter displays the voltage signal received by the control module from the fuel tank pressure (FTP) sensor.
Fuel Tank Rated Capacity
- This parameter displays the capacity of the fuel tank in liters or gallons.
Fuel Trim Learn
- 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.