Scan Tool Data Definitions 1

SCAN TOOL DATA DEFINITIONS

The Engine Scan Tool Data Definitions contains a brief description of all engine related parameters 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 Relay Circuit Status: This parameter displays the diagnostic state of the output driver for the air conditioning (A/C) clutch relay control circuit. The scan tool will display OK or Fault. OK indicates that no circuit faults are detected during the current test. Fault indicates that a short or open circuit/component exists, electronically disconnecting the circuit/component from the control module.

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

APP Indicated Angle: This parameter displays the angle of the accelerator pedal as calculated by the control module using the signals from the accelerator pedal position sensors. The 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.

APP Sensor 1: This parameter displays the voltage signal sent to the control module from accelerator pedal position (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.

APP Sensor 1: This parameter displays the angle of the accelerator pedal position (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.

APP Sensor 1 and 2: This parameter displays the results of a control module test that compares the signals from the accelerator pedal position (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 2: This parameter displays the voltage signal sent to the control module from accelerator pedal position (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.

APP Sensor 2: This parameter displays the angle of the accelerator pedal position (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.

BARO: 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.

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

Commanded Gear: This parameter displays the transmission gear commanded by the control module. The scan tool will display P/N when the transmission is commanded to park or neutral. The scan tool will display R when the transmission is commanded to reverse. The scan tool will display 1-5 when the transmission is commanded into a specific low gear.

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.

Current Gear: This parameter displays the transmission gear commanded by the control module. The scan tool will display 1 when the control module has commanded first gear regardless of the gear selector position. The scan tool will display up to 6 to depending upon which gear is commanded and what transmission is in the vehicle. The scan tool will display 9 if the transmission gear is not known.

Current Gear Signal: This parameter displays the status of the current gear signal to the control module from the transmission. The scan tool will display Valid when the signal matches the commanded gear position from the control module. The scan tool will display Invalid when the signal does not match the commanded state of the transmission.

Cycles Of Misfire Data: This parameter displays the number of cylinder firing events that were recorded as misfires as determined by the control module. the scan tool will display a high value as misfire events increase. The scan tool will display a lower value when there are fewer misfire events.

Cylinder 1-8 IC Circuit Status: This parameter displays the diagnostic state of the output driver for the ignition control circuits. The scan tool will display Ok if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Cylinder 1 IC Circuit Status: This parameter displays the diagnostic state of the output driver for the ignition control circuit. The scan tool will display Ok if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Cylinder 1-8 Injector Circuit Status: This parameter displays the current diagnostic state of the output driver for the injector control circuit. The scan tool will display Ok if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

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

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

Desired HO2S Bank 1 Sensor 1: This parameter indicates the desired heated oxygen sensor (HO2S) bank 1 sensor 1 output voltage as calculated by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value when the control module enriches the system, and a lower value during leaner running conditions.

Desired HO2S Bank 2 Sensor 1: This parameter indicates the desired heated oxygen sensor (HO2S) bank 2 sensor 1 output voltage as calculated by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value when the control module enriches the system, and a lower value during leaner running conditions.

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

Desired Ignition Spark: This parameter displays the desired ignition spark as determined by the control module. The scan tool will display a higher value when more spark is desired, such as heavy load conditions. The scan tool will display a lower value when less spark is desired, such as at idle.

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

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

Desired Torque: This parameter displays the desired torque as calculated by the control module. The scan tool will display a higher value when more torque is desired, such as under high load conditions. The scan tool will display a lower value when less torque is desired, such as at idle.

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 the ignition system. OFF indicates the EC ignition relay is not being commanded on by the control module.

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

ECM Reset: This parameter displays the status of the control module this ignition cycle. The scan tool will display Yes when an internal control module reset has occurred this ignition cycle. The scan tool will display NO when no internal control module reset has occurred this ignition cycle.

ECT Sensor: This parameter displays the temperature of the engine coolant calculated by the control module, 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.

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

Engine Off EVAP Test Conditions Met: This parameter displays the status of the engine off EVAP test (EONV). The scan tool will display Yes if the conditions have been met to run the EONV diagnostic tests. The scan tool will display No if the conditions have not been met to run the EONV diagnostics.

Engine Off EVAP Test Ran Last Ignition Cycle: This parameter displays the status of the engine off EVAP test (EONV) as determined by the control module. The scan tool will display Yes when the EONV diagnostic test has run during the last ignition cycle. The scan tool will display No when the EONV diagnostic has not run during the last ignition cycle.

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

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

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

Engine Oil Pressure Sensor: This parameter displays the pressure of the engine oil as calculated by the control module using a signal from the engine oil pressure (EOP) sensor. The scan tool will display oil pressure when the engine is running. The engine oil pressure sensor has a range of values indicating a low value when the oil pressure is low to a high value when the oil pressure is high.

Engine Oil Temperature Sensor: This parameter displays the temperature of the engine oil as calculated by the control module using a signal from the engine oil temperature sensor. The engine oil temperature sensor has a range of values indicating a low value when the oil temperature is low to a high value when the oil temperature is high.

Engine Run Time: 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: 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.

Engine Torque: This parameter displays the torque output of the engine as calculated by the control module based on various inputs.