Engine Control Module Scan Tool Information (LZ1 w/Tech 2)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
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 DTCs are set
- The on-board diagnostics are functioning properly
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The engine scan tool data list represents values that would be seen on a normally running engine.
NOTE:
A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service information for use in diagnosis.
Engine Control Module Scan Tool Data
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop/Accessories OFF | |||
| 5-volt Reference 1 | - | 5 Volts | This parameter displays the voltage sensed on the 5-volt reference 1 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage. |
| 5-volt Reference 1 Circuit Status | - | 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 | - | 5 Volts | This parameter displays the voltage sensed on the 5-volt reference 2 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage. |
| 5-volt Reference 2 Circuit Status | - | 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 High side Pressure Sensor | A/C OFF | 1.43 Volts | The scan tool displays 0-5 volts. The voltage applied to the ECM input for the A/C refrigerant pressure sensor. |
| A/C ON | 2.39 Volts | ||
| A/C High side Pressure Sensor | A/C OFF | 500-2, 220 kPa (72-319 psi) | The scan tool displays 0-3450 kPa (0-500 psi). The voltage applied to the ECM input from the A/C refrigerant pressure sensor is converted to a pressure value. |
| A/C ON | 300-1, 220 kPa (43-174 psi) | ||
| Air Flow Calculated | - | 3-7 g/s | This parameter displays the air flow of the engine as calculated by the control module using information from the manifold absolute pressure (MAP) sensor. The scan tool will display a range of values indicating a high air flow when MAP pressure is high and a low air flow when MAP pressure is low. This value is listed in grams per second (g/s). |
| Ambient Air Temperature | - | Varies | Outside temperature at any given altitude expressed in degrees |
| APP Indicated Angle | Accelerator pedal not applied | 0% | This parameter displays the angle of the accelerator pedal as calculated by the control module using the signals from the accelerator pedal position sensors. The accelerator pedal position (APP) indicated angle is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| Accelerator pedal WOT | 100% | ||
| APP Sensor | - | Varies | This parameter displays the average of the APP sensors as calculated by the throttle actuator control (TAC) module. The APP average is a range of values indicating a low number when the accelerator pedal is not depressed to a high number when the accelerator pedal is fully depressed. This value is listed in counts. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.7-1.2 Volts | This parameter displays the voltage signal sent to the control module from APP sensor 1 of the APP sensor assembly. APP sensor 1 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 4.2-4.5 Volts | ||
| APP Sensor 1 Indicated Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP sensor 1 as calculated by the control module using the signal from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 100% | ||
| APP Sensor 2 | Accelerator pedal not actuated | 0.3-0.5 Volts | This parameter displays the voltage signal sent to the control module from APP sensor 2 of the APP sensor assembly. APP sensor 2 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 2.2-2.5 Volts | ||
| APP Sensor 2 Indicated Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP sensor 2 as calculated by the control module using the signal from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 100% | ||
| APP Sensor 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the APP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond to different accelerator pedal positions. |
| Axle Torque Actual | - | Varies | This parameter displays the Axle Torque Actual value sent from the Hybrid Control Processor to the ECM and ABS modules. |
| Axle Torque Command | - | Varies | This parameter displays the current conditions the hybrid controller determines the optimum engine torque, which it sends as a request to the engine control module. |
| Axle Torque Commanded | - | Varies | This parameter displays the Commanded Predicted Axle Torque value sent from the engine control module to the hybrid control processor (HCP). |
| BARO | - | Varies with altitude | This parameter displays the barometric pressure as calculated by the control module using the signal from the MAP sensor measured when the ignition is turned ON with the engine not running. The control module will update the barometric pressure during wide-open throttle (WOT) conditions. |
| BPP Signal | - | Released | This parameter displays the state of the brake pedal position switch as determined by the brake pedal switch. The scan tool will display Applied when the brake pedal is depressed, and Released when the brake pedal is not depressed. |
| BPP Circuit Signal | - | Released | The BCM uses the Brake Pedal Position sensor as an indication that the brake pedal is applied or released. |
| Catalytic Converter Protection Active | - | No | This parameter indicates the status of the control module control for catalytic converter protection. The scan tool will indicate YES if the control module is adjusting fuel and ignition quantity and timing to protect the catalytic converter from damage. The scan tool will indicate NO if the control module is in a normal fuel and ignition control mode. |
| Calc. TWC Temp. Bank 1 and Bank 2 | - | Varies | This parameter displays the catalytic converter temperature as calculated by the control module. |
| Change Engine Oil Indicator Command | - | No | This parameter displays the state of the change engine oil lamp control circuit as commanded by the control module. |
| CKP Resync Counter | - | Varies | This parameter displays the number of times the control module has to synchronize the CKP sensor. |
| CKP Sensor | - | Engine Idle Speed | This parameter displays the engine speed as calculated by the control module using the signal from the CKP sensor. |
| CKP Active Counter | - | Incrementing | This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position (CKP) sensor. |
| Cmmd. A/F Equivalence Ratio | - | 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 | - | Counts | This parameter displays a rolling count of the number of primary cam position sensor pulses. A change in the value of this parameter indicates primary cam position sensor activity |
| CMP Angle | - | ° | This parameter displays the position of the intake camshaft for bank 1 in terms of degrees of camshaft rotation (advance) from the park position (a value of zero represents the park position). |
| CMP Command | - | Percentage | This parameter displays the commanded duty cycle from the engine control module for the intake cam phase output for bank 1. |
| CMP Sensor | - | Engine Idle Speed | This parameter displays the engine speed as calculated by the control module using the signal from the CMP sensor. |
| CMP Sol Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the Int CMP solenoid Bn 1 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| CMP Sol Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the Int CMP solenoid Bn 1 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| CMP Sol Short Volts Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the Int CMP solenoid Bn 1 control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| 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 | - | No | This parameter displays the state of the crank request input to the control module from the ignition switch. The scan tool will display Yes when the ignition switch is in the Crank position. The scan tool will display No when the ignition switch is in any other position. |
| Cruise Control Active | - | Inactive | This parameter displays the status of the cruise control system as determined by the control module. The scan tool will display Yes when the cruise control system is in control of vehicle speed. The scan tool will display No when the cruise control system is not operating. |
| Cruise Disengage 1-8 History | Cruise ON | None | The Scan tool displays the last 8 cruise control disengages in order from 1 to 8. There are 20 possible causes for the cruise control to disengage. |
| Cruise ON/OFF Switch | - | ON | This parameter displays the state of the ON/OFF switch input to the control module. The scan tool will display ON when the cruise ON/OFF switch is ON. The scan tool will display OFF when the cruise ON/OFF switch is OFF. |
| Cruise Resume/Accel Switch | - | Invalid | This parameter displays the state of the Resume/Accel switch input to the control module When the cruise control switch is in the ON position and the Resume/Accel switch is activated, the scan tool displays ON. When the Resume/Accel switch is released the scan tool displays OFF. |
| Cruise Set/Coast Switch | - | Invalid | This parameter displays the state of the Set/Coast switch input to the control module from the cruise control system. When the cruise control switch is in the ON position and the Set/Coast switch is activated, the scan tool displays ON. When the Set/Coast switch is released the scan tool displays OFF. |
| Cruise Control Cancel Switch | - | Off | This parameter displays the status of the cruise control cancel switch as determined by the control module. The scan tool will display On when the cruise control cancel switch is on. The scan tool will display Off when the cruise control cancel switch is off. |
| Cycles of Misfire Data | - | Incrementing 0-100 | This parameter displays the number of cylinder firing events recorded by the control module |
| Cyl. 1, 4, 6, 7 Deact. Sol. CKT Open Test Status | - | OK | This parameter displays the status of the output driver for the Cylinder Deactivation solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Cyl. 1, 4, 6, 7 Deact. Sol. CKT Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the Cylinder Deactivation 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. |
| Cyl. 1, 4, 6, 7 Deact. Sol. CKT Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the Cylinder Deactivation 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. |
| Cyl. 1, 4, 6, 7 Deact. Sol. Command | - | Cyl. On/Cyl. Off | This parameter displays ON when V4 mode is commanded or OFF when V8 mode is commanded. |
| Cyl. Deact. Disable 1-8 History | - | Varies | This parameter shows the reason the Active Fuel Management system changed from V4 mode to V8 mode, for the last 8 occurrences. Reasons displayed include: None, MAP Low, Brake Vac Low, APP Rate High, APP High, Ign. Voltage, Eng Oil Press, Eng Oil Temp, Eng Coolant Temp, Engine Speed, Trans. Gear, Trans. Range, Trans. Shifting, DLC Override, Min Time All Cyl, Max Deact Time, Oil Aeration, DFCO Active, Inj Stable Time, Heater Perf, MAP DTC, Brk Vac Sen DTC, TAC DTC, EOP DTC, ECT DTC, IAT DTC, VSS DTC, Deact Sol DTC, Misfire DTC, CKP DTC, CMP DTC, EC Ign Relay DTC, Torq Reduction, Axle Torq Limit, ECT Overtemp, TWC Overtemp, Piston Protect, Coolant Hot, RPM Limit. |
| Cyl. Deact. Performance Test | - | OK | This parameter displays OK if all the Active Fuel Management enabling conditions are met. The parameter displays Fault if one or more enabling conditions are out of range. |
| Cyl. Deact. System Command | - | All Cylinder | This parameter displays several signals associated with the status of the Active Fuel Management system. |
| Cyl. Deactivation Cycles | - | Counts | This parameter displays the number of times the engine switches between V8 mode, and V4 mode during each ignition cycle. The counter will reset to zero and increment again, if the count reaches 255 during the current ignition cycle. |
| Cylinder 1-8 IC Ckt Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Cylinder 1-8 IC Ckt Open Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Cylinder 1-8 IC Ckt Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Cylinder 1-8 Injector Ckt Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Cyl. 1-8 Injector Ckt Open Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Cyl. 1-8 Injector Ckt Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Decel. Fuel Cut-off | - | Inactive | This parameter displays the status of the operating mode used to turn OFF the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned OFF the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally. |
| Deact. Inhibit Reason | - | Varies | This parameter displays Yes if one of the following Deactivation Inhibit Reason is detected. Deact. Inhibit A/C Clutch On, Deact. Inhibit Acceleration Tip In, Deact. Inhibit APP High, Deact. Inhibit APP Rate High, Deact. Inhibit Axle Torque Limiting, Deact. Inhibit Booster Pressure Sensor DTC, Deact. Inhibit Calc, Torque, Deact. Inhibit CKP Sensor DTC, Deact. Inhibit CMP Sensor DTC, Deact. Inhibit Cyl. Deactivation Solenoid DTC, Deact. Inhibit Cyl. Deactivation System DTC, Deact. Inhibit DFCO Active, Deact. Inhibit DLC Override, Deact. INhibit EC Ign. Relay DTC, Deact. Inhibit ECT, Deact. Inhibit ECT Sensor DTC, Deact. Inhibit Eng. Oil Temperature, Deact. Inhibit Eng. Overtemperature Protection, Deact. Inhibit Eng. RPM, Deact. Inhibit EOP, Deact. Inhibit EOP Sensor DTC, Deact. Inhibit Ethanol Concentration Too High, Deact. Inhibit Ethanol Learn in Progress, Deact. Inhibit Heater Performance, Deact. Inhibit HO2S 2 Test, Deact. Inhibit Hot Coolant Mode, Deact. Inhibit IAT Sensor DTC, Deact. Inhibit Ignition Voltage, Deact. Inhibit Inj. Stable Time, Deact. Inhibit Low Brake Booster Vacuum, Deact. Inhibit Low Speed, Deact. Inhibit Manifold Vacuum Low, Deact. Inhibit MAP Sensor DTC, Deact. Inhibit Max. Throttle Exceeded, Deact. Inhibit Maximum Deactivation Time Exceeded, Deact. Inhibit Min. Time After TAC DTC, Deact. Inhibit Minimum Time On All Cylinders, Deact. Inhibit Misfire DTC, Deact. Inhibit Oil Aeration, Deact. Inhibit Piston Protection, Deact. Inhibit RPM Limit, Deact. Inhibit TAC Sysytem DTC, Deact. Inhibit Torque Reduction, Deact. Inhibit Trans Gear, Deact. Inhibit Trans Range, Deact. Inhibit Trans Shifting, Deact. Inhibit TWC Overtemperature Protection, Deact. Inhibit TWC Temperature Low, Deact. Inhibit TWC Temperature Low. |
| Distance Since DTC Cleared | - | Varies | This parameter displays the distance accumulated since an emission diagnostic trouble code was cleared. The scan tool will display increasing distance as the vehicle is driven. |
| Distance Since First Failure | - | Varies | This parameter displays the distance accumulated when the emission diagnostic trouble code first failed. |
| Distance Since Last Failure | - | Varies | This parameter displays the distance accumulated when the emission diagnostic trouble code last failed. |
| Distance with Cyl. Activated | - | km/miles | This parameter displays the accumulated distance driven with all of the engine's cylinders activated during the current Ignition key cycle. |
| Distance with Cyl. Deactivated | - | km/miles | This parameter displays the accumulated distance driven with the engine's cylinders deactivated during the current Ignition key cycle. |
| DMCM Clnt. Pump 1 Command | - | On/Off | This parameter displays the state of the Auxiliary Coolant Pump. |
| DMCM Clnt. Pump 1 Open Test Status | - | OK | This parameter displays the status of the Auxiliary Coolant Pump 1 control circuit. |
| DMCM Clnt. Pump 1 Short to Gnd. Test Status | - | OK | This parameter displays the status of the Auxiliary Coolant Pump 1 control circuit. |
| DMCM Clnt. Pump 1 Short to Volt Test Status | - | OK | This parameter displays the status of the Auxiliary Coolant Pump 1 control circuit. |
| DMCM Coolant Temperature | - | Varies | This parameter displays the actual Auxiliary Coolant Temperature. |
| DMCM Coolant Temperature | - | OK | This parameter displays if the Auxiliary Coolant Temperature is OK or Low. |
| Drvr Axle Torque Request | - | Nm. | This parameter displays a (desired) output value after comparing engine load as an input to the hybrid control processor and engine control module.
NOTE:
Comparing this parameter to the Engine Torque Actual parameter can be useful in diagnosing a concern. The values between these 2 parameter should be similair. |
| DTC Present | - | No | This parameter displays that a Diagnostic Trouble Code (DTC) has been set that prevents Autostops. |
| EC Ignition Relay Ckt Short Gnd Test Status | - | Not Run | This parameter displays the status of the output driver for the engine control (EC) Ignition Relay control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EC Ignition Relay Ckt Open Test Status | - | Not Run | This parameter displays the status of the output driver for the engine control (EC) Ignition Relay control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EC Ignition Relay Ckt Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the engine control (EC) Ignition Relay control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EC Ignition Relay Command | - | ON | This parameter displays the commanded state of the EC Ignition relay control circuit. The scan tool will display ON or OFF. ON indicates the EC ignition relay control circuit is being grounded by the control module, allowing voltage to other control module circuits and systems. OFF indicates the EC ignition relay is not being commanded ON by the control module. |
| EC Ignition Relay Feedback Signal | - | Battery Voltage | This parameter displays the voltage signal sent to the control module from the engine control ignition relay. The scan tool will display battery voltage when the engine is running. The scan tool will display no voltage when the relay is OFF. |
| ECM Challenge Status | - | Valid | This parameter shows the immobilizer system status of the ECM challenge. This indicates whether the currently calculated ECM challenge is valid. |
| ECM in VTD Fail Enable | - | No | This parameter displays whether or not the engine control module (ECM) is in failure enable mode for the vehicle theft deterrent (VTD) system. |
| ECT Sensor | - | 85-105°C (185-220°F) | This parameter displays the temperature of the engine coolant based on the input from the engine coolant temperature (ECT) sensor. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature. |
| Engine Load | - | 25-30% | This parameter displays the engine load in percent based on inputs to the control module from various engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no load. The scan tool will display a high percentage when the engine is running at a high RPM under a heavy load. |
| Engine OFF Time | - | Varies | This parameter displays the time elapsed since the engine turned OFF. The scan tool will display the time in hours, minutes and seconds. The engine OFF time will reset to zero when the engine starts. |
| Engine Oil Level Switch | - | OK | This parameter displays the state of the EOP as determined by the control module. The control module monitors the EOP switch to determine if the EOP is sufficient. The scan tool will display low when the EOP is below a predetermined value. |
| Engine Oil Life Remaining | - | Varies | This parameter displays the amount engine oil life remaining before requiring an oil change based on calculations by the control module. The scan tool will display lower values as the engine oil life approaches 0 miles. |
| Engine Oil Pressure Sensor | - | OK | This parameter displays the state of the EOP as determined by the control module. The control module monitors the EOP switch to determine if the EOP is sufficient. The scan tool will display low when the EOP is below a predetermined value. |
| Engine Oil Pressure Sensor | - | kPa/psi | This parameter displays the actual engine oil pressure measured by a sensor. |
| Engine Oil Temperature Calculated | - | Varies °C/°F | This parameter displays the temperature of the engine oil as calculated by the control module using various sensor inputs. The engine oil temperature calculated has a range of values indicating a low value when the oil temperature is low to a high value when the oil temperature is high. |
| Engine Run Time | - | Varies | This parameter displays the time elapsed since the engine was started. The scan tool will display the time in hours, minutes and seconds. The engine run time will reset to zero when the engine stops running. |
| Engine Speed | - | 650 RPM | This parameter displays the speed of the crankshaft as determined by the control module using an input from the CKP sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds. |
| Engine Torque Actual | - | Nm | This parameter displays the Engine Torque Actual value from the engine control module.
NOTE:
This parameter can be useful when comparing it to Drvr Axle Torque Request. |
| EPM Inhibit Reason | - | None | This parameter displays the reason for the regulated voltage control (RVC) override command. RVC lowers system operating voltage to reduce the system electrical load and improve fuel economy performance. The RVC command will be overridden if the voltage commanded is below the minimum system voltage required to ensure that the fuel demand, powertrain OBD diagnostics, airflow measurement, cylinder deactivation, or transmission control module functions will execute properly. Reasons include the following: None, Device Control, Fuel Demand, OBD Diagnostics, Airflow Measurement, Cylinder Deactivation, Transmission Control Module Request. |
| EVAP Fault History | - | No Fault | This parameter displays the result of the evaporative emission (EVAP) system diagnostic as determined by the control module. The scan tool will display various messages, depending on the result of the test. |
| EVAP Purge Solenoid Command | - | 15% | This parameter displays the on-time or duty cycle of the EVAP purge solenoid commanded by the control module expressed as a percent. The scan tool will display a high percentage when the control module is commanding the EVAP purge solenoid to be open a large amount. The scan tool will display a low percentage when the control module is commanding the EVAP purge solenoid to be open a small amount. The scan tool will display 0 when the control module is commanding the EVAP purge solenoid closed. |
| EVAP Purge Solenoid Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission purge solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EVAP Purge Solenoid Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission purge solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EVAP Purge Solenoid Ckt Short Volts Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission purge solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EVAP Vent Solenoid Command | - | Venting | This parameter displays the state of the EVAP vent solenoid commanded by the control module. The scan tool will display venting when the control module is commanding the EVAP vent solenoid to be open. The scan tool will display a not venting when the control module is commanding the EVAP vent solenoid to be closed. |
| EVAP Vent Solenoid Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission vent solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EVAP Vent Solenoid Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission vent solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| EVAP Vent Solenoid Ckt Short Volts Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the evaporative emission vent solenoid control circuit as determined by the control module. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Exh. CMP Variance | - | Degrees | This parameter displays in degrees, the difference between the desired exhaust camshaft position and the actual exhaust camshaft position. |
| Fail Counter | - | Varies Counts | This parameter displays the number of times a specific diagnostic has run and failed. |
| FC Relay 1 Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 1 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 1 Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 1 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 1 Ckt Short VoltsTest Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 1 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 1 Command | - | Off | This parameter displays the commanded state of the cooling fan relay 1 control circuit. The cooling fan relay 1 should be ON when the scan tool indicates the FC relay 1 command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the FC Relay 1 Command is OFF. |
| FC Relay 2 Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 2 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 2 Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 2 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 2 Ckt Short VoltsTest Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 2 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 2 Command | - | Off | This parameter displays the commanded state of the cooling fan relay 2 control circuit. The cooling fan relay 2 should be ON when the scan tool indicates the FC relay 2 command is ON. The cooling fan relay 2 should be OFF when the scan tool indicates the FC Relay 2 Command is OFF. |
| FC Relay 3 Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 3 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 3 Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 3 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 3 Ckt Short VoltsTest Status | - | OK | This parameter displays the diagnostic state of the output driver for the cooling fan relay 3 control circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| FC Relay 3 Command | - | Off | This parameter displays the commanded state of the cooling fan relay 3 control circuit. The cooling fan relay 3 should be ON when the scan tool indicates the FC relay 3 command is ON. The cooling fan relay 23 should be OFF when the scan tool indicates the FC Relay 2 Command is OFF. |
| FC Ckt Open Test Status | - | Not Run | This parameter displays the status of the output driver for the fan control 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 an open in the circuit. |
| FC Ckt Short Volts Test Status | - | Not Run | This parameter displays the status of the output driver for the fan control 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 voltage on the circuit. |
| FC Ckt Short Gnd Test Status | - | Not Run | This parameter displays the status of the output driver for the fan control 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 Level Sensor | - | 0-5 Volts | This parameter displays the voltage signal received by the control module from the fuel level sensor. |
| Fuel Pump Relay Command | - | ON | This parameter displays the commanded state of the Fuel Pump control circuit. The fuel pump should be ON when the scan tool indicates the Fuel Pump Enable command is ON. The fuel pump should be OFF when the scan tool indicates the Fuel Pump Enable +-*+Command is OFF. |
| Fuel Pump Speed Ckt. Open Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump 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 Malfunction if there is an open in the circuit. |
| Fuel Pump Speed Ckt. Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump 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 Malfunction if there is an short to ground in the circuit. |
| Fuel Pump Speed Ckt. Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump 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 Malfunction if there is an short to voltage in the circuit. |
| Fuel Tank Level Remaining | - | Varies | This parameter displays the amount of fuel remaining in the fuel tank as measured in percentage. The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensors. The scan tool will display a higher value with a full fuel tank, and a lower value with an empty fuel tank. |
| Fuel Tank Pressure Sensor | - | 1.5 Volts | This parameter displays the voltage signal sent to the control module from the sensor used to monitor the pressure inside the fuel tank. The scan tool will display a low voltage when the pressure in the fuel tank is high. The scan tool will display a high voltage when the pressure in the fuel tank is low or in a vacuum. |
| Fuel Tank Pressure Sensor | - | 0 inches H2O (0 mm Hg) | This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low value when the pressure in the fuel tank is low or a vacuum. The scan tool will display a high value when the pressure in the fuel tank is high. |
| Fuel Tank Rated Capacity | - | 17.5-20 gals (66.24-75.7 liter) | This parameter displays the rated maximum quantity of fuel the fuel tank will hold. This is calibrated in the control module to match the vehicle. See Owner's Manual-Capacities and Specifications. |
| Fuel Trim Cell | - | Varies | This parameter displays the fuel trim cell number as calculated by the control module based on engine speed and load inputs. The scan tool will display a lower number as conditions are nearer to idle, and a higher value as conditions approach maximum engine speed and maximum load. |
| Fuel Trim Learn | - | Enabled | This parameter indicated if the control module is adjusting long term fuel trim in response to the short term fuel trim. The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim corrections, the scan tool displays Enabled. |
| Fuel Trim System Test State | - | Monitoring | This parameter indicates the status of the Fuel Trim System Test. The scan tool will display Disabled, Enabled, Monitoring, or Run Purge Test. |
| Fuel Volatility | - | Varies | This parameter indicates the rate the fuel can be vaporized in the cylinder as calculated by the control module. The scan tool displays Low, Moderate, or High. The scan tool will display HIGH when the fuel volatility is high. The scan tool will display LOW when the fuel volatility is low. |
| HO2S Bank 1 or 2 Sensor 1 | - | 80-850 mV | This parameter indicates the heated oxygen sensor (HO2S) bank 1 or bank 2, sensor 1 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions. |
| HO2S Bank 1 or 2 Sensor 1 Heater | - | 0.60-0.80 amps | This parameter displays the current through the control module when the bank 1 or bank 2, sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bank 1 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low. |
| HO2S Bn 1 or 2 Sen 1 Heater Ckt Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 or Bank 2 Senor 1. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 or 2 Sen 1 Heater Ckt Open Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 or Bank 2 Senor 1. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 or 2 Sen 1 Heater Ckt Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 or Bank 2 Senor 1. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 or 2 Sen 1 Heater Command | - | 0-99% | This parameter displays the commanded state of the Bank 1 or Bank 2 Sensor 1 heater by the control module. The scan tool will display a higher value as the heater command is increased, and a lower value if the heater is not commanded ON. |
| HO2S Bn 1 or 2 Sen 1 Heater Command | - | ON | This parameter displays the commanded state of the Bank 1 or Bank 2 Sensor 1 heater by the control module. The scan tool will display ON when the heater is commanded ON. The scan tool will display OFF when the heater is commanded OFF. |
| HO2S Bank 1 or 2 Sensor 2 | - | 80-850 mV | This parameter indicates the heated oxygen sensor (HO2S) bank 1 sensor 2 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions. |
| HO2S Bank 1 or 2 Sensor 2 Heater | - | 0.60-0.80 amps | This parameter displays the current through the control module when the bank 1 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bank 1 Sensor 2 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low. |
| HO2S Bn 1 Sen 2 Heater Ckt Short Gnd Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 Sen. 2. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 Sen 2 Heater Ckt Open Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 Sen. 2. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 Sen 2 Heater Ckt Short Volts Test Status | - | OK | This parameter displays the status of the output driver for the HO2S Heater Bank 1 Sen. 2. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| HO2S Bn 1 or 2 Sen 2 Heater Command | - | 0-99% | This parameter displays the commanded state of the Bank 1 Sensor 2 heater by the control module. The scan tool will display a higher value as the heater command is increased, and a lower value if the heater is not commanded ON. |
| HO2S Bn 1 or 2 Sen 2 Heater Command | - | ON | This parameter displays the commanded state of the Bank 1 Sensor 2 heater by the control module. The scan tool will display ON when the heater is commanded ON. The scan tool will display OFF when the heater is commanded OFF. |
| Hood Ajar Switch 1 | - | Ajar | This parameter displays the Hood Ajar 1 switch as either Closed or Ajar. |
| Hood Ajar Switch 2 | - | Ajar | This parameter displays the Hood Ajar 2 switch as either Closed or Ajar. |
| Hood Position | - | Open | This parameter displays the Hood Position as Closed, Ajar, Open or Invalid. Hood Open indicates that the state of the hood switch prevented an Autostop. Autostops are not allowed with the hood open. |
| Hot Open Loop | - | Inactive | This parameter indicates the status of the fuel delivery system. The scan tool will display Active if the fuel system is running in open loop due to a temperature concern. The scan tool will display Inactive if the fuel system is operating normally. |
| IAT Sensor | - | Varies | This parameter displays the temperature of the air entering the engine as calculated by the control module based on the input from the intake air temperature (IAT) sensor. The scan tool will display a low value when the air temperature is low, and a high value when the air temperature is high. |
| ICE Autostart Entry | - | No | This parameter displays Yes if one of the following Autostart Reason is detected.Auxiliary Transmission Pump, Control Function Active, Data Validity, Drivability, ECM Request, Electric Motor Inverter Temperature, Electric Motor Temperature, Engine Coolant Temperature, Hood Open, HV Battery Module Voltage, HV Battery Pack Temperature, HV Battery Pack Voltage Level, HV Battery Power Limits, HV Battery State of Charge, Key Forced ICE Autostart Request, Max ICE Autostop Time, Minimum Run Time Not Met, Reduced Power, Remote Start, Reverse Grade, System Optimization, System Voltage Low, TCM Override, Tow/Haul Switch On, Transfer Case in 4WD-Low, Transmission Range, Transmission Temperature, Vehicle Speed Too High, |
| ICE Autostart Inhibit | - | Varies | The scan tool displays Yes if one of the following Autostart Inhibit Reason is detected. Auxiliary Transmission Pump, Control Function Active, Data Validity, Drivability, ECM Request, Electric Motor Inverter Temperature, Electric Motor Temperature, Engine Coolant Temperature, Hood Open, HV Battery Module Voltage, HV Battery Pack Temperature, HV Battery Pack Voltage Level, HV Battery Power Limits, HV Battery State of Charge, Key Forced ICE Autostart Request, Max ICE Autostop Time, Minimum Run Time Not Met, Reduced Power, Remote Start, Reverse Grade, System Optimization, System Voltage Low, TCM Override, Tow/Haul Switch On, Transfer Case in 4WD-Low, Transmission Range, Transmission Temperature, Vehicle Speed Too High |
| ICE Status | - | Varies | This parameter displays the current status of the ICE with the following. Engine Stalled, Stop, Running, Start, Off, Silent Start, Invalid. |
| Ignition Accessory Signal | - | OFF | This parameter displays the state of the ignition 0 input to the control module from the ignition switch. The scan tool will display ON when the ignition switch is in the ignition accessory position. The scan tool will display OFF when the ignition switch is in any other position. |
| Ignition 1 Signal | - | Battery Voltage | This parameter displays the voltage measured at the ignition 1 circuit of the control module. Voltage is applied to the control module when the ignition switch is in the ignition 1 position. The scan tool will display a low value when the voltage is low. The scan tool will display a high value, such as battery voltage, when the voltage is higher. |
| Injector PWM Bank 1 or Bank 2 | - | 2.0-5.4 ms | This parameter indicates the average commanded ON time for each injector on Bank 1 or Bank 2 by the control module. The scan tool will display a larger value for a longer injector commanded ON time, causing more fuel to be delivered to the cylinders. The scan tool will display a smaller value for a shorter injector commanded ON time, causing less fuel to be delivered to the cylinders. |
| Injector 1-8 Disabled Due To Misfire | - | No | 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. |
| Intake Manifold Pressure | - | 70-75 kPa | This parameter displays the pressure difference between the MAP and the barometric pressure (BARO) as calculated by the control module. The scan tool will display a higher value during high vacuum conditions, such as idle or deceleration. The scan tool will display a lower value during low vacuum conditions, such as wide open throttle or low load cruising. |
| Knock Detected Cyl. 1-8 | - | NO | 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 | This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensors. The scan tool displays a high value for a large amount of spark retard, and a low value for a small amount of spark retard. |
| Long Term FT Bank 1 or Bank 2 | - | 0% ± 10% | This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 1 is used for the long term correction of the fuel delivery in bank or bank 2. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event. |
| LT FT Test Avg. Bank 1 or Bank 2 | - | 1% | This parameter is calculated by the control module based on an intrusive test by the control module. The Long Term FT test average used for the long term correction of the fuel delivery in each bank. The scan tool will a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event. |
| LT FT Avg. Bank 1 or Bank 2 w/o Purge | - | 1% | This parameter is calculated by the control module based on the Short Term FT value. The Long Term FT bank 1 is used for the long term correction of the fuel delivery in bank 1. The scan tool will display a high value for a large amount of long term fuel correction, and 0 percent for no long term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event. |
| Loop Status | - | Closed | 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. |
| Low EOP Indicator Command | - | OFF |
|
| MAF Performance Test | - | OK | This parameter displays the status of the mass air flow (MAF) performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| MAF Sensor | Engine Idling | 3.4-6.5 g/s | This parameter indicates the quantity calculated by the control module based on a signal from the MAF sensor. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds. |
| Engine speed at 2, 500 RPM | 11.88 g/s | ||
| MAF Sensor | - | 1510-3224 Hz | This parameter indicates the frequency signal received from the MAF sensor by the control module. The scan tool will display a high value at high engine speeds, and a low value at low engine speeds. |
| MAP Performance Test 1 | - | OK | 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 | - | OK | This parameter displays the status of the MAP performance test 2 by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| MAP Sensor | - | 30-38 kPa | This parameter indicates the manifold absolute pressure inside the engine as calculated by the control module based on the signal from the MAP sensor. The scan tool will display a higher value wide open throttle, and a lower value at idle. |
| MAP Sensor | - | 0.75-1.40 Volts | This parameter indicates the voltage signal received by the control module from the MAP sensor. The scan tool displays a low voltage at idle, and a high voltage at wide open throttle. Barometric pressure and altitude can effect these values. |
| MIL Ckt Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the malfunction indicator lamp control (MIL) circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| MIL Ckt Open Test Status | - | OK | This parameter displays the diagnostic state of the output driver for the malfunction indicator lamp control (MIL) circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| MIL Ckt Short Volts Test Status | - | Not Run | This parameter displays the diagnostic state of the output driver for the malfunction indicator lamp control (MIL) circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| MIL Command | - | OFF | This parameter displays the commanded state of the MIL control circuit. The MIL should be ON when the scan tool indicates the MIL Command is ON. The malfunction indicator lamp should be OFF when the scan tool indicates the MIL Command is OFF. The control module will command the MIL ON when the ignition is ON with the engine OFF in order to perform a bulb check. |
| MIL Requested by DTC | - | 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. |
| Misfire Current Cyl. 1-8 | - | 0 | This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on Cylinders 1-8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders. |
| Misfire History Cyl. 1-8 | - | 0 | This parameter displays the number of possible misfires that have occurred after 195 current misfires have been counted on Cylinders 1-8 as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. This counter should display some activity, but the activity should be the same for all cylinders. |
| Not Run Counter | - | Varies | This parameter displays the number of ignition cycles that a DTC has not run. The scan tool display will increment as the number of ignition cycles increase without a DTC pass or Fail. |
| Pass Counter | - | Counts | The scan tool displays the number of times a DTC has run and passed. |
| PNP Switch | - | P/N | This parameter indicates the range selection of the automatic transmission as calculated by the control module based on input from the PNP switch. The scan tool will display, In Gear, Park, or Neutral depending on the PNP switch position. |
| Power Enrichment | - | Inactive | This parameter indicates if the control module has detected conditions appropriate to operate in Power Enrichment mode. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module enters Open Loop operation and increases injector pulse width when in power enrichment mode. |
| Reduced Engine Power | - | Inactive | This parameter indicates if the control module has detected that a TAC system fault has occurred. The scan tool will display Active if the mode is in operation, and Inactive if the mode is not in operation. The control module limits engine power when this mode is Active. |
| RVS Disable 1-8 History | - | None | This parameter displays one of the last eight reasons that powertrain has disabled remote vehicle start (RVS). |
| RVS Request Signal | - | No | 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 Bank 1 or Bank 2 | - | 0% ± 10% | This parameter displays the short term correction to fuel delivery for bank 1 or bank 2 by the control module in response to the amount of time the oxygen sensor voltage spends above or below the 450 mV threshold. The scan tool will display 0 percent if no adjustments are required. The scan tool will display a higher positive value if fuel has to be added, and a higher negative value if fuel has to be removed. |
| Spark | - | 9-11° | This parameter displays the spark timing being commanded by the control module ON the IC circuit. The scan tool will display a negative value if the spark timing is before top dead center (BTDC) or spark advance; the scan tool will display a positive value if the spark timing is after top dead center (ATDC) or spark retard. Because the ignition control module sets spark advance at a fixed value BTDC while operating in bypass mode, the displayed spark advance only reflects true spark timing when the PCM has commanded IC mode. |
| Start Up ECT | - | Varies | This parameter Indicates the engine coolant temperature at engine start up as calculated by the control module based on the signal from the ECT sensor. The scan tool will display a higher value on a warmer engine, and a lower value on a colder engine. |
| Start Up IAT Sensor 1 | - | Varies | This parameter Indicates the intake air temperature at engine start up as calculated by the control module based on the signal from the IAT sensor. The scan tool will display a higher value during warmer under hood temperatures, and a lower value during colder under hood temperatures. |
| ST FT Test Avg. Bank 1 or Bank 2 | - | 1% | This parameter is calculated by the control module based on an intrusive test by the control module. The Short Term FT Test Average used for the short term correction of the fuel delivery in each bank. The scan tool will display a high value for a large amount of short term fuel correction, and 0% for no short term fuel trim correction. The scan tool will display a negative value when fuel system is running too rich and fuel is being removed from the combustion event. The scan tool will display a positive value if the fuel system is running lean and fuel is being added to the combustion event. |
| TAC Forced Engine Shutdown | - | NO | 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 | - | Varies °C/°F |
|
| Torque Management Spark Retard | - | 0° | This parameter indicates how much the ignition spark timing is being retarded to control torque by the control module. The scan tool will display a higher value under extreme torque control conditions such as spinning wheels. The scan tool will display a lower value under low torque control conditions such as light driving. |
| Torque Reg. Inhibit Fuel | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit Minimum Idle Inhibit | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit Minimum Torque | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit Spark | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit Spark Advance | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit TAC | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Torque Reg. Inhibit TAC Limit | - | No | This parameter displays the reason the ECM would be causing the transmission torque request to be limited, and if the condition is currently present. |
| Total Knock Retard | - | 0° | This parameter indicates how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions. |
| Total Misfire | - | 0 | This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on all cylinders as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter. |
| TP Desired Angle | - | 2-6% | This parameter indicates the desired throttle angle calculated by the TAC module as commanded by the vehicle operator. The scan tool will display a higher value when the accelerator pedal is depressed, and a lower value as the accelerator pedal is released. |
| TP Indicated Angle | - | 2-6% | This parameter displays the angle of the throttle plate as calculated by the control module using the signals from the throttle position (TP) sensors. The TP indicated angle is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is wide open. |
| TP Performance Test | - | OK | This parameter displays the status of the TP performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test. |
| TP Sensor 1 | - | 4.1-4.5 Volts | This parameter displays the voltage signal sent to the control module from TP sensor 1 of the throttle assembly. The TP sensor 1 is a range of values indicating a high voltage when the throttle is closed to a low voltage when the throttle plate is fully open. |
| TP Sensor 1 Indicated Position | - | 2% | This parameter displays the angle of the throttle position (TP) sensor 1 as calculated by the control module using the signal from the TP sensor 1. The TP sensor 1 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open. |
| TP 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 Sensors 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the TP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that TP sensor 1 and TP sensor 2 voltages correspond to the same throttle position. Disagree indicates that TP sensor 1 and TP sensor 2 voltages correspond to different throttle positions. |
| TP Sensor 2 | - | 0.5-0.8 Volts | This parameter displays the voltage signal sent to the control module from TP sensor 2 of the throttle assembly. The TP sensor 2 is a range of values indicating a low voltage when the throttle is closed to a high voltage when the throttle plate is fully open. |
| TP Sensor 2 Indicated Position | - | 2% | This parameter displays the angle of the TP sensor 2 as calculated by the control module using the signal from the TP sensor 2. The TP sensor 2 is a range of values indicating a low percentage when the throttle is closed to a high percentage when the throttle is fully open. |
| TP Sensor 2 Learned Minimum | - | 5.0-3.7 Volts | This parameter displays the learned minimum value of throttle position (TP) sensor 2 as recorded by the control module during the last learn procedure. |
| Torque Delivered Signal | - | Varies lbs ft Y |
|
| TWC Mon. Bank 1or Bank 2 Test Count | - | No Result | This parameter displays the number of repeated catalyst monitor diagnostic test that have been performed since a code clear for bank 1 or bank 2, used to determine if a sufficient number of tests have run to report a passing condition. |
| TWC Mon. Bank 1 or Bank 2 Test Result | - | No Result | This parameter displays the status of the catalyst monitor diagnostic. Multiple tests may run before the diagnostic reports a Pass or Fail. When a determination has been made, the diagnostic is complete for the current trip and will not attempt any further tests. |
| TWC Mon. Off Idle Test Conditions Met | - | No | This parameter displays if the off-idle conditions for the catalyst monitor diagnostic have been met. Once the off-idle conditions have been met, Yes is displayed and the vehicle can return to idle and allow the catalyst monitor diagnostic test to run. |
| TWC Monitor Test State | - | Inactive | This parameter displays 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 Short Gnd Test Status | - | OK | This parameter displays the diagnostic state of the Vehicle Speed Sensor circuit. The scan tool will display OK, Fault or Not Run. The scan tool will display OK if the circuit is operating correctly. |
| Vehicle Speed Sensor | - | 0 km/mi | This parameter indicates the vehicle speed as calculated by the control module based on a signal from the vehicle speed sensor (VSS). The scan tool will display a higher value at higher vehicle speeds, and a lower value at lower vehicle speeds. |
| VTD Auto. Learn Counter | - | Counts | The scan tool displays the count value when using the 30-minute reprogramming procedure. Three 10-minute cycles, or three counts, are required to complete the 30-minute auto learn reprogramming procedure. |
| VTD Auto. Learn Timer | - | Inactive | 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 Auto. Learn Timer | - | Counts | The scan tool displays the count value when using the 30 minute reprogramming procedure. Three 10-minute cycles, or three counts, are required to complete the 30 minute auto learn reprogramming procedure. |
| VTD 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 Fuel Enabled | - | Yes | This parameter indicates the VTD system has enabled fuel. |
| VTD Password Learn Enabled | - | No | The scan tool will display Yes when a valid theft password has been learned. |
| VTD Password Learned | - | No | This indicates learning of the VTD password received from the platform electronics is enabled. VTD password learning is first enabled in assembly plant (prior to the manufacturer's enable counter being set to zero) may be re-enabled using 1 of 2 procedures. |
| VTD Security Code Accepted | - | No | This parameter indicates that the received immobilizer system security code is correct. |
| VTD Security Code Lockout | - | Inactive | This parameter displays Active or Inactive. Security Code Lockout Active indicates that the security code has not passed and lockout is active. |
| VTD Security Code Programmed | - | No | This parameter indicates if the immobilizer system security code has been programmed. |
| VTD Security Info. Programmed | - | Yes | This parameter indicates if the immobilizer secret information, e.g. powertrain pre-release password, powertrain secret key, has been programmed. |
| Warm-ups Since DTC Cleared | - | Varies | 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. |
| Warm-ups w/o Emission Faults | - | Varies | This parameter indicates the number of warm up cycles that have occurred without an emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without an emission fault. |
| Warm-ups w/o Non-emission Faults | - | Varies | This parameter indicates the number of warm up cycles that have occurred without a non-emission fault present. The scan tool will display a 0 if a fault has occurred. The scan tool will display a higher count if a number of warm up cycles have occurred without a non-emission fault. |
| Wide Open Throttle | - | NO | This parameter indicates the throttle status commanded by the control module. The scan tool will display YES is the vehicle throttle is commanded to wide open. The scan tool will display NO if the vehicle throttle is commanded to an amount less than 100%. |
Output Control
| Parameter | Description |
|---|---|
| A/C Relay | The engine must be running and the ECM must receive an A/C request from the HVAC control module in order to enable the output control. The ECM de-energizes the A/C compressor clutch relay when you select OFF. The relay remains de-energized until you select ON. |
| CAC Coolant Pump | This function activates the charge air cooler (CAC) coolant pump relay. The normal commanded state is NONE. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool. |
| Cooling Fan | Commands the fan relay ON and OFF. |
| 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:
When DISABLE is selected, the control module turns the injector OFF for 30 seconds. |
| Dash Lamps | Malfunction Indicator Lamp-Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. |
| Engine Controls Ignition Relay | This function activates the engine control (EC) ignition relay. The normal commanded state is NONE. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool. |
| Engine Speed Control | Activates the idle air control (IAC) valve to change engine RPM. The normal commanded state is NONE. To enable the RPM control, all instruction on the scan tool must be completed. The system will INCREASE or DECREASE the engine speed. The SET STEP VALUE changes the engine speed by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the tool. |
| EVAP Purge Solenoid | Activates the EVAP Purge Valve. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure exceeds 24 mm Hg (12 in H2O). |
| EVAP Service Test | Activates the on-board EVAP diagnostic test. |
| EVAP Vent Solenoid | Activates the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state unless one of the following conditions occurs:
|
| EVAP Purge/Seal | This control enables 2 functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON (non-venting). The normal commanded state of both valves is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The second function seals the system after using the purge function to obtain a specific amount of fuel tank pressure (FTP). When activated the purge valve is commanded to 0 percent and the vent valve is commanded ON (non-venting). Both functions remain in the commanded state until cancelled by the tool or the FTP exceeds 24 mm Hg (12 in H2O). |
| 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:
The selected fuel injector can only be flowed/pulsed once per ignition cycle. |
| Fuel Pump Relay | Controls the fuel pump relay. The normal commanded state is NONE. When commanded ON/OFF, the PCM turns the fuel pump ON/OFF. If the engine is running, and the fuel pump is commanded OFF, the engine will stall. The system remains in the commanded state until cancelled by the scan tool. |
| Fuel Trim Enable | Disables the ECM ability to learn new fuel trim parameters. The commanded states are NONE, ENABLED, DISABLED. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the scan tool. |
| Fuel Trim Reset | Activates the reset of fuel trim data in all fuel trim cells. |
| GEN L-Terminal | The commanded states are ON and OFF. Selecting OFF commands the ECM to turn OFF the generator and stop generating an output voltage. |
| HO2S Heater Bank 1 Sensor 1 Command | Activates the HO2S bank 1 sensor 1 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 1 sensor 1 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool. |
| HO2S Heater Bank 1 Sensor 2 Command | Activates the HO2S bank 1 sensor 2 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 1 sensor 2 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool. |
| HO2S Heater Bank 2 Sensor 1 Command | Activates the HO2S bank 2 sensor 1 heater. The commanded states include NONE, ON, and OFF. The normal commanded state is NONE. Commanding the HO2S bank 2 sensor 1 heater ON turns on the heater driver. The system remains in the commanded state until cancelled by the tool. |
| HO2S Heater Learn | his output control is used to trigger the reset of the learned resistances for the oxygen sensor heaters following a replacement in service. The learned resistances are reset to a calibration used to prevent overheating of the sensors until more accurate resistances may be learned following an extended engine OFF time, typically 12 or more hours. |
| Idle Spark | Disables and enables idle spark advance with the engine running. |
| Loop Status | Controls the system loop status. The commanded states include NONE, OPEN, or CLOSED. The normal commanded state is NONE. When commanded OPEN or CLOSED, the system remains in the commanded state until cancelled by the scan tool. |
| Malfunction Indicator Lamp | Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. |
| Misfire Graphic | Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph. |
| Reverse Inhibit | This device control is used to override the state of the Reverse Inhibit output. |
| RVS Disable History Reset | This output control is used to trigger the reset of the last 8 reasons the ECM has disabled remote vehicle start (RVS). |
| SCB Control | Activates the solenoid from the none, increase, and decrease in increments and decrements by 10%. The range is 0-100%. |
| Skip Shift Solenoid | Activates the Skip Shift Solenoid |
| Spark Retard | Controls the amount of spark retard. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of spark retard by 1 degree increments within a range of 0-10 degrees maximum retard. The system remains in the commanded state until cancelled by the tool. |
| Starter Relay | This output control is used to override the state of the Starter Relay output. Fuel and spark are disabled to prevent the engine from starting if the starter relay output is commanded ON. |
| Throttle Position | This function opens the throttle plate in 10 percent increments. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. |
| Throttle Sweep | This function moves the Throttle plate slowly from a closed position to wide open position, aiding diagnosis of TAC motor. |