Engine Control Module Scan Tool Information (LS3, L99)
WARNING: This page is about a different car, the 2010 Chevrolet Camaro. 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 diagnostic trouble codes (DTCs)
- On-board diagnostics are functioning properly.
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.
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 manual for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Engine Controls .
Engine Control Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Base Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off/Brake Pedal Released | |||
| 5 V Reference 1 | - | V | This parameter will display the 5 V Reference 1 voltage. |
| 5- V 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 V Reference 2 | - | V | This parameter will display the 5 V Reference 2 voltage. |
| 5 V Reference 2 Circuit Status | - | 1.43 V | The scan tool displays 0-5 V. This is the A/C refrigerant pressure sensor voltage signal. |
| A/C On | 2.39 V | ||
| A/C Disengage History 1-8 | - | Varies | This parameter indicates the reason the A/C compressor was disengaged. The reasons displayed are: None, A/C Pressure, Eng Spd, Batt Voltage, Stall Prevention, RPM Unstable, WOT, Launch Perf, Coolant Hot. |
| A/C High Side Pressure Sensor | - | 1.43 V | The scan tool displays 0-5 V. This is the A/C refrigerant pressure sensor voltage signal. |
| A/C On | 2.39 V | ||
| A/C High Side Pressure Sensor | - | 868 kPa (125 psi) | The scan tool displays -103 to +3,119 kPa (-14 to +452 psi). This is the A/C refrigerant pressure sensor voltage signal converted to pressure. |
| A/C On | 1568 kPa (227 psi) | ||
| A/C Off for WOT | - | No | This parameter indicates if the A/C system was commanded off for a wide open throttle event. |
| A/C Disable - A/C Pressure Out of Range | - | No | The scan tool displays Yes or No. Yes is displayed when the system pressure exceeds 3,034 kPa (440 psi). |
| A/C Compressor Clutch Relay Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the A/C relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| A/C Compressor Clutch Relay Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the A/C relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| A/C Compressor Clutch Relay Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the A/C relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| A/C Compressor Clutch Relay Command | - | OFF | The scan tool displays ON or OFF. ON is displayed when the ECM has energized the A/C compressor clutch relay. |
| With A/C Selected | ON | ||
| A/C Request Signal | - | No | This parameter displays the state of the air conditioning (A/C) request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. The scan tool will display Yes or No. Yes indicates the control module is receiving a request from the HVAC system to ground the A/C clutch relay control circuit, engaging the A/C compressor clutch. No indicates the control module is not receiving a request from the HVAC system to ground the A/C clutch relay control circuit. |
| With A/C Selected | Yes | ||
| Accelerator Pedal Position | Accelerator pedal not actuated | 0 % | This parameter displays the average of the accelerator pedal position (APP) sensors as calculated by the throttle actuator control (TAC) module. The APP average is a range of values indicating a low number when the accelerator pedal is not depressed to a high number when the accelerator pedal is fully depressed. This value is listed in percent. |
| Accelerator pedal fully actuated | 100 % | ||
| Air/Fuel Equivalence Ratio Command | - | 1.0:1 | Equivalence numbers greater than one represent excess fuel in the fuel air mix. Equivalence numbers less than one represent a deficiency of fuel in the fuel air mix for complete combustion. The equivalence ratio will be reported as one when the vehicle is in Closed Loop. |
| Ambient Air Temperature | - | Varies | This parameter displays the estimated ambient air temperature. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.94 V | This parameter displays the voltage signal sent to the control module from APP sensor 1 of the APP sensor assembly. APP sensor 1 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed. |
| Accelerator pedal fully actuated | 4.27 V | ||
| APP Sensor 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the APP sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond to different accelerator pedal positions. |
| APP Sensor 1 Position | - | % | This Parameter contains the displacement determined from accelerator pedal position sensor 1 (corrected and normalized based upon its learned minimum and maximum positions). |
| APP Sensor 2 Position | - | 0% | 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. |
| APP Sensors | - | % | This Parameter displays the accelerator pedal position resulting directly from the difference of the accelerator pedal position sensors (prior to any compensation to determine driver intent). |
| BARO | - | 60-104 kPa (varies with altitude) | This parameter displays the barometric pressure that is received from the BARO sensor that is integrated within the ECM in kPa. |
| BARO Sensor | - | 3 V | This parameter shows the barometric pressure in volts. |
| Brake Pedal Position Circuit Signal | - | Released | The scan tool displays Applied, Valid, Released, or Invalid. This parameter shows the position of the brake pedal position sensor through the serial data bus. |
| Brake pedal depressed | Applied | ||
| Brake Pedal Position Signal | - | Released | The scan tool displays Applied, Valid, Released, or Invalid. This parameter shows the position of the brake pedal position sensor through the serial data bus. |
| Calculated Air Flow | - | 3-6 g/s | This parameter displays the air flow of the engine as calculated by the control module using information from the manifold absolute pressure (MAP) sensor. The scan tool will display a range of values indicating a high air flow when MAP pressure is high and a low air flow when MAP pressure is low. This value is listed in grams per second (g/s). |
| Calculated Catalyst Temperature Bank 1 or 2 | - | 446°C (834°F) | Calculated catalytic converter temperature. |
| Calculated Engine Oil Temperature | - | 109°C (228°F) | This parameter displays the engine oil temperature. |
| Camshaft Position | - | 0 Degree | 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). |
| Camshaft Position Active Counter | - | Counts | This parameter displays a rolling count of the number of intake cam position sensor pulses for bank 1. A change in the value of this parameter indicates intake cam position sensor activity for bank 1. |
| Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Test Status | - | OK | This parameter displays the state of the camshaft actuator solenoid control circuit. The parameter displays Malfunction if the camshaft actuator solenoid control circuit is shorted to voltage. |
| Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the camshaft actuator solenoid control circuit. The parameter displays Malfunction if the camshaft actuator solenoid control circuit is shorted to ground. |
| Camshaft Position Actuator Solenoid Valve Control Circuit Open Test Status | - | OK | This parameter displays the state of the camshaft actuator solenoid control circuit. The parameter displays Malfunction if the camshaft actuator solenoid control circuit is opened. |
| Camshaft Position Command | - | 0% | This parameter displays the on-time or duty cycle of the camshaft position (CMP) actuator solenoid valve as commanded by the control module. |
| Camshaft Position Sensor | - | RPM | This Parameter contains the engine speed determined from the period of the primary cam position sensor. |
| Camshaft Position Variance | - | ° | This parameter displays the absolute difference between the desired and actual positions of the intake camshaft for bank 1 in terms of degrees of camshaft rotation. |
| Catalyst Monitor Complete This Ignition Cycle | - | Varies | This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No |
| Catalyst Monitor Enabled This Ignition Cycle | - | Varies | This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| Catalyst Monitor Not at Idle Test Conditions Met | - | Yes/No | This Parameter indicates the status of the catalyst monitor diagnostic. Catalyst Monitor Test Running indicates yes or no when the catalyst monitor diagnostic is actively running a test |
| Catalyst Monitor Test Counter Bank 1 or Bank 2 | - | Counts | This Parameter contains the number of repeated results of the 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). |
| Catalyst Monitor Test Result Bank 1 or Bank 2 | - | No Result/Failed/Passed | This Parameter indicates the status of the catalyst monitor diagnostic for bank 1 or bank 2. Multiple tests may run before the diagnostic reports a "Pass" or "Fail" and will be tracked by Catalyst Monitor Diagnostic Test Counter Bank 1 or bank 2. When this Parameter reports a "Pass" or "Fail", the diagnostic is complete for the current trip and will not attempt any further tests on bank 1 or bank 2. |
| Catalyst Monitor Test State | - | Active/Inactive | This Parameter indicates the status of the catalyst monitor diagnostic by displaying active or inactive. This test will only run with the engine at idle. |
| Change Engine Oil Indicator Command | - | OFF | The scan tool displays ON or OFF. This is the state of the Change Engine Oil indicator as commanded by the ECM. |
| 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. |
| Cooling Fan Relay 1 Command | - | ON | This parameter displays ON or OFF. This indicates the commanded state of the relay by the ECM. |
| Cooling Fan Relay 1 Control Circuit Open Test Status | - | OK/Indeterminate | This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open. The parameter displays Indeterminate until the circuit has been commanded ON. |
| Cooling Fan Relay 1 Control Circuit Low Voltage Test Status | - | OK/Indeterminate | This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to ground. The parameter displays Indeterminate until the circuit has been commanded ON. |
| Cooling Fan Relay 1 Control Circuit High Voltage Test Status | - | OK/Indeterminate | This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is shorted to voltage. The parameter displays Indeterminate until the circuit has been commanded ON. |
| Cooling Fan Relays 2 and 3 Command | - | ON/OFF | This parameter displays ON or OFF. This indicates the commanded state of the relay by the ECM. |
| Cooling Fan Relays 2 and 3 Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the fan control relay 2 and 3 control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Cooling Fan Relays 2 and 3 Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the fan control relay 2 and 3 control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Cooling Fan Relays 2 and 3 Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the fan control relay 2 and 3 control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Crank Request Signal | - | No | This parameter shows the power mode status of the starter motor. When Yes is displayed, a request to engage the starter has been received by the ECM. |
| Ignition switch in the crank position | Yes | ||
| Crankshaft Position Active Counter | - | 0-255 Counts incrementing | This parameter displays an incrementing counter when the ECM receives a signal from the crankshaft position (CKP) sensor. |
| Crankshaft Position Resync Counter | - | 0 Counts | This parameter displays the number of times the ECM has to resynchronize the CKP sensor. |
| Crankshaft Position Sensor | - | Same as Engine Speed | This parameter displays the engine speed as calculated by the ECM using the signal from the CKP sensor. |
| Cruise Control | - | Inactive | This parameter displays the status of the cruise control system as determined by the control module. The scan tool will display Active when the cruise control system is in control of vehicle speed. The scan tool will display Inactive when the cruise control system is not operating. |
| Cruise Control Disengage History 1-8 | - | Varies | These parameters indicate the last 8 reasons the ECM disengaged the cruise control. Reason 1 contains the most recent reason. The reasons include the following: Brake Pedal Initialize, Cancel, Clutch, Coast Disengage, Coast Speed Low, TAC Inhibit, Accel Rate, Decel Rate, High Speed, Illegal Mode, Low Speed, None, Cruise Sw OFF, Over Set Speed, S/C On Speed Hi, ECM Inhibit, Simul S/C-R/A, TCS, Under Set Speed, DLC Override, Memory DTC, Eng Run Time, Engine Speed, DTC Set, RPM Limit, First Gear, APP Override, Low Voltage, D Whl Spd Low, D Whl Spd Hi, Cruise S/S, Cruise Sw Data, ECT Overtemp, VSES, Trans. DTC, BPP Data, BPP DTC, Park Brake, ACC Inhibit, ACC Brake DTC, ACC Option, ACC Brake Inop, PTO Active. |
| Cruise Control On/Off Switch | - | OFF | The scan tool displays ON or OFF. This is the state of the switch as monitored by the body control module (BCM). |
| Switch pressed | ON | ||
| Cruise Control Resume/Acceleration Switch | - | OFF | The scan tool displays ON or OFF. This is the state of the switch as monitored by the body control module (BCM). |
| Switch pressed | ON | ||
| Cruise Control Set/Coast Switch | - | OFF | The scan tool displays Active or Inactive. This is the state of the switch as monitored by the body control module (BCM). |
| Switch pressed | ON | ||
| Cycles of Misfire Data | - | 0-100 Counts incrementing | This parameter displays the number of cylinder firing events that were recorded as misfires as determined by the control module. |
| Cylinder 1-8 Current Misfire Counter | - | 0 Counts | The scan tool displays 0-255 counts. The display shows the number of misfires that have been detected during the last 200 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all of the cylinders, and in low numbers. |
| Cylinder 1-8 History Misfire Counter | - | 0 Counts | The scan tool range is 0-255 counts. This parameter indicates the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire or DTC P0300 has become active. The misfire history counter will update every 200 cylinder firing events. |
| Cylinder 1-8 Injector Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the fuel injector control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Cylinder 1-8 Injector Disabled-Misfire Detected | - | 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. |
| Cylinder 1-8 Deactivation Solenoid Valve Command | - | V8 | This parameter displays V8 when all two Active Fuel Management (AFM) cylinder solenoids are deactivated or V4 when the AFM cylinder solenoids are activated. |
| Cylinder 1-8 Deactivation Solenoid Valve Control Circuit High Voltage 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. |
| Cylinder 1-8 Deactivation Solenoid Valve Control Circuit Low Voltage 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. |
| Cylinder 1-8 Deactivation Solenoid Valve Control Circuit 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. |
| Cylinder 1-8 Injector Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the Fuel Injector control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Cylinder 1-8 Injector Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the Fuel Injector control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Cylinder 1-8 Injector Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the Fuel Injector control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Cylinder 1-8 Knock Detected | - | 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. |
| Cylinder 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 Deactivation Disable History 1- 8 | - | 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. |
| Cylinder Deactivation 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. |
| Cylinder Deactivation System Command | - | All Cylinders | This parameter displays several signals associated with the status of the Active Fuel Management system. |
| Deceleration Fuel Cutoff | - | Inactive | This parameter displays the status of the operating mode used to turn off the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned off the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally. |
| Desired Camshaft Position | - | 0 Degrees | This parameter displays the desired camshaft angle as commanded by the control module. |
| Desired Idle Speed | - | Approximately 650 RPM | This parameter displays the desired engine idle speed as commanded by the control module. The desired idle speed varies depending on engine load. |
| Desired Throttle Position | - | 6 % | The scan tool displays percent The scan tool displays 0-100 %. The ECM indicates the desired throttle angle commanded by the vehicle operator. The scan tool indicates the desired throttle angle commanded by the vehicle operator. |
| With Ignition On, Engine Off, Accelerator pedal not actuated | 11 % | ||
| With Ignition On, Engine Off, Accelerator pedal fully actuated | 100% | ||
| 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 Malfunction | - | Varies | This parameter displays in kilometers or miles the distance traveled since a Malfunction occurred. |
| Distance Since Last Malfunction | - | Varies | This parameter displays in kilometers or miles the distance traveled since the last Malfunction occurred. |
| Distance with Cylinder Activated | - | km/miles | This parameter displays the accumulated distance driven with all of the engine's cylinders activated during the current key cycle. |
| Distance with Cylinder Deactivated | - | km/miles | This parameter displays the accumulated distance driven with half of the engine's cylinders deactivated during the current key cycle. |
| Engine Controls Ignition Relay Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the engine control ignition relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Engine Controls Ignition Relay Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the Engine Control Ignition Relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Engine Controls Ignition Relay Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the engine control ignition relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Engine Controls Ignition Relay Feedback Signal | - | 13.0-14.7 V | 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. |
| Engine Controls 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. |
| ECM in Immobilizer Fail Enable Mode | - | No | This parameter indicates whether or not the engine control module (ECM) is in failure enable mode for the vehicle theft deterrent (VTD) system. |
| ECT Sensor | - | 96-103°C (204-217°F) | This parameter displays the temperature of the engine coolant based on the input from the engine coolant temperature sensor. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature. |
| Engine Load | - | Varies | This parameter displays the engine load in percent based on inputs to the control module from various engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no load. The scan tool will display a high percentage when the engine is running at a high RPM under a heavy load. |
| Engine OFF Time | - | Varies | This parameter displays the time elapsed since the engine was shut OFF. |
| Engine Oil Level Switch (If Equipped) | - | OK | This parameter displays if the level of the engine oil is within range as determined by the control module from information received from the engine oil level switch. |
| Engine Oil Life Remaining | - | 0-100 % | This parameter displays the percent of engine oil life remaining. The controller calculates the engine oil life by monitoring engine load, coolant temperature, and engine speed. |
| Engine Oil Pressure Sensor | - | Voltage | This parameter displays the state of the engine oil pressure as determined by the control module. The control module monitors the engine oil pressure switch to determine if the engine oil pressure is sufficient. The scan tool will display low when the engine oil pressure is below a predetermined value. |
| Engine Oil Pressure Sensor | - | kPa/PSI | This parameter displays the engine oil pressure measured by the engine oil pressure sensor. |
| 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 | - | 500-600 RPM | This parameter displays the speed of the crankshaft as determined by the control module using an input from the crankshaft position (CKP) sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds. |
| Engine Speed Circuit High Voltage Test Status | - | OK | This parameter displays the state of the engine speed circuit. The parameter displays Fault if the engine speed circuit is shorted to voltage. |
| Engine Speed Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the engine speed circuit. The parameter displays Fault if the engine speed circuit is shorted to ground. |
| Engine Speed Circuit Open Test Status | - | OK | This parameter displays the state of the engine speed circuit. The parameter displays Fault if the engine speed circuit is opened. |
| EVAP Malfunction History | - | None | This parameter displays the result of the evaporative emission (EVAP) system diagnostic. Scan tool displays None, EXCESS VACUUM, PURGE VALVE LEAK, SMALL LEAK, WEAK VACUUM, or NO TEST RESULT. The EVAP Fault History indicates the status of EVAP system diagnostics performed by the ECM. |
| EVAP Monitor Complete This Ignition Cycle | - | Varies | This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| EVAP Monitor Enabled This Ignition Cycle | - | Varies | This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the EVAP purge solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| EVAP Purge Solenoid Valve Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the EVAP purge solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the EVAP purge solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| EVAP Purge Solenoid Valve Command | - | 10-15 % | 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 Vent Solenoid Valve Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the EVAP vent solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| EVAP Vent Solenoid Valve Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the EVAP vent solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| EVAP Vent Solenoid Valve Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the EVAP vent solenoid control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| EVAP Vent Solenoid Valve Command | - | Venting | This parameter displays the state of the EVAP vent solenoid commanded by the control module expressed as Venting or Not Venting. The scan tool will display Venting when the control module is commanding the EVAP vent solenoid to be open. The scan tool will display Not Venting when the control module is commanding the EVAP vent solenoid to be closed. |
| Extended Travel Brake Pedal Position Signal | - | Applied/Released | This parameter will display the state of the brake pedal, applied or released. |
| Fuel Control Loop Status | - | Closed | Closed Loop indicates that the ECM is controlling fuel delivery according to oxygen sensor voltage. In open loop, the ECM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on throttle position (TP) sensor, ECT, and mass air flow (MAF) sensor inputs only. |
| Fuel Enrichment Hot Catalyst | - | Active/Inactive | Fuel Enrichment Catalyst Protection Active indicates fuel is being added to cool the catalytic converter. |
| Fuel Enrichment Hot Coolant | - | Active/Inactive | Hot Coolant Enrichment Active indicates that the conditions to enable hot coolant enrichment are active and that a richer than stoichiometric air/fuel ratio is being commanded in order to help cool the engine when a system malfunction is causing the engine to run at extreme temperatures. |
| Fuel Level Sensor Left Tank | - | Varies | This parameter displays the approximate fuel level in the fuel tank as a voltage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full. |
| Fuel Level Sensor Right Tank | - | Varies | This parameter displays the approximate fuel level in the fuel tank as a voltage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a high reading when the fuel level in the tank is low or near empty. The scan tool will display a low reading when the fuel level in the tank is high or near full. |
| Fuel Pump Relay Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Fuel Pump Relay Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Fuel Pump Relay Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the fuel pump relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Fuel Pump Relay Command | - | ON | This parameter displays the commanded state of the fuel pump relay control circuit. The fuel pump relay should be ON when the scan tool indicates the Fuel Pump Relay Command is On. The fuel pump relay should be off when the scan tool indicates the Fuel Pump Relay Command is Off. |
| Fuel Tank Pressure Sensor | - | -19.8 to +12.52 mm Hg/-10.5 to +6.17 in H2O | This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low value when the pressure in the fuel tank is low or a vacuum. The scan tool will display a high value when the pressure in the fuel tank is high. |
| Fuel Tank Pressure Sensor | - | 0.2-4.0 V | This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low voltage when the pressure in the fuel tank is high. The scan tool will display a high voltage when the pressure in the fuel tank is low. |
| Fuel Tank Rated Capacity | - | 61.2 Liters (16.2 Gallons) | This parameter displays the rated maximum quantity of fuel the fuel tank will hold. This is calibrated in the control module to match the vehicle. |
| Fuel Trim Learn | - | Enabled | This parameter indicates if the control module is adjusting long term fuel trim in response to the short term fuel trim. The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim corrections, the scan tool displays Enabled. |
| Fuel Trim Memory Cell | - | Counts | This Parameter displays long term fuel corrections that is active based upon the current operating conditions (MAP, engine speed, purge duty cycle, A/C compressor state, and transmission range). |
| Fuel Trim System Test State | - | Disabled/Running/EVAP Purge Test Running/Complete | This Parameter displays the current state of the fuel adjustment system diagnostic. |
| 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. |
| Generator F-Terminal Signal | - | 45 % Varies with electrical load | This parameter is an ECM input of the generator field duty cycle. This is an indication of generator load on the engine. |
| Generator L-Terminal Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the generator L-terminal control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Generator L-Terminal Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the generator L-terminal control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Generator L-Terminal Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the generator L-terminal control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Generator L-Terminal Signal Command | - | 0-100 % | This parameter displays the control modules commanded state of the voltage regulator on the generator. |
| Generator L-Terminal Signal Command | - | ON | This parameter indicates the generator commanded state by the ECM. |
| HO2S Bank 1 Sensor 1 or Bank 2 Sensor 1 | - | 50-900 mV - Varies | This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust. |
| HO2S Bank 1 Sensor 2 or Bank 2 Sensor 2 | - | 400-700 mV - Varies | This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust. |
| HO2S Heater Bank 1 Sensor 1 or Bank 2 Sensor 1 | - | amps | This Parameter display the current feedback for the oxygen sensor heater output for bank 1 sensor 1 or bank 2 sensor 1. |
| HO2S Heater Bank 1 Sensor 2 or Bank 2 Sensor 2 | - | amps | This Parameter display the current feedback for the oxygen sensor heater output for bank 1 sensor 2 or bank 2 sensor 2. |
| HO2S Heater Control Circuit High Voltage Test Status Bank 1 Sensor 1 or Bank 2 Sensor 1 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to voltage. |
| HO2S Heater Control Circuit High Voltage Test Status Bank 1 Sensor 1 or Bank 2 Sensor 2 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to voltage. |
| HO2S Heater Control Circuit Low Voltage Test Status Bank 1 Sensor 1 or Bank 2 Sensor 1 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to ground. |
| HO2S Heater Control Circuit Low Voltage Test Status Bank 1 Sensor 2 or Bank 2 Sensor 2 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to ground. |
| HO2S Heater Control Circuit Open Test Status Bank 1 Sensor 1 or Bank 2 Sensor 1 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is open. |
| HO2S Heater Control Circuit Open Test Status Bank 1 Sensor 2 or Bank 2 Sensor 2 | - | OK/Malfunction/Not Run | This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is open. |
| HO2S Heater Command Bank 1 or 2 Sensor 1 or 2 Heater Command | - | 0-100 % | This parameter displays the HO2S heater ON time in percentage, as commanded by the control module. |
| HO2S Heater Command Bank 1 or 2 Sensor 1 or 2 | - | ON/OFF | This parameter display the state of the HO2S heater control circuit as commanded by the control module. |
| HO2S Heater Monitor Complete This Ignition Cycle | - | Varies | This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| HO2S Heater Monitor Enabled This Ignition Cycle | - | Varies | This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| HO2S 1 Heater Command | - | Varies | This parameter displays the commanded state of the HO2S heater by the control module. The scan tool will display a higher percentage as the heater command is increased, and a lower percentage if the heater is not commanded ON. |
| HO2S 1 Heater Command | - | ON | This parameter displays the commanded state of the HO2S heater by the control module. The scan tool will display On as the heater is commanded ON, and OFF if the heater is not commanded ON. |
| HO2S 1 Heater Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the HO2S heater control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| HO2S 1 Heater Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the HO2S heater control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| HO2S 1 Heater Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the HO2S heater control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| IAT Sensor | - | Varies | The scan tool displays °C/F. The ECM converts the resistance of the intake air temperature (IAT) sensor to degrees in the same manner as the engine coolant temperature (ECT) sensor. The scan tool displays a range of -40 to +132°C (-40 to +270°F). |
| Ignition 1 Signal | - | ON | This parameter displays the voltage measured at the ignition 1 circuit of the control module. Voltage is applied to the control module when the ignition switch is in the ignition 1 position. |
| Ignition Coil 1-8 Control Circuit High Voltage Test Status | - | OK/Malfunction/Not Run | This parameter displays the state of the Ignition control circuit. The parameter displays Malfunction if the Ignition control circuit is shorted to voltage. |
| Ignition Coil 1-8 Control Circuit Low Voltage Test Status | - | OK/Malfunction/Not Run | This parameter displays the state of the Ignition control circuit. The parameter display Malfunctions if the Ignition control circuit is shorted to ground. |
| Ignition Coil 1-8 Control Circuit Open Test Status | - | OK/Malfunction/Not Run | This parameter displays the state of the Ignition control circuit. The parameter displays if Malfunction the Ignition control circuit is open. |
| Ignition Timing | - | 18-24 Degrees | The scan tool displays a range of -64 to +64°. The scan tool displays the amount of degrees the ECM commands. The ECM computes the desired spark advance using the following: (1) ECT, (2) engine speed (RPM), (3) load, (4) vehicle speed. The ECM adjusts the timing. A negative (-) value indicates degrees before top dead center (BTDC) or spark advance; a positive value indicates degrees after top dead center (ATDC) or spark retard. |
| Immobilizer Automatic Learn Timer | - | Inactive | This parameter indicates the time elapsed within the current auto-learn cycle within the immobilizer system. |
| Immobilizer Fuel Disable | - | Inactive | This parameter indicates the VTD system has disabled fuel. |
| Immobilizer Fuel Disable Until Ignition Off | - | No | This parameter indicates the VTD system has disabled fuel for the remainder of the ignition cycle. |
| Immobilizer Fuel Enabled | - | Yes | This parameter indicates that the VTD system has enabled the fuel system. |
| Immobilizer Password Learned | - | No | This parameter indicates if learning of the immobilizer secret information is enabled. |
| Injector Duty Cycle Bank 1 or 2 | - | 0.82-1.50 ms | This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module. |
| Intake Manifold Pressure | - | kPa | This Parameter displays the engine intake manifold vacuum pressure calculated as the difference between ambient air pressure (barometric pressure) and intake manifold absolute pressure (MAP). |
| Knock Retard | - | 0 Degrees | The scan tool displays Degrees. Indicates the amount of spark the PCM is removing from ignition control (IC) spark advance in response to the signal from the knock sensors. The traction control system desired torque signal from the electronic brake and traction control module (EBTCM) may cause knock retard to display a value more than 0.0 degrees if traction control is active. |
| Long Term Fuel Trim Bank 1 or 2 | - | 0 % | This parameter displays the commanded Long Term Fuel Trim correction by the control module for bank 1 or bank 2 for cruise and acceleration conditions. |
| Long Term Fuel Trim Test Average Bank 1 or 2 | - | 0 % | This Parameter displays the filtered long term closed loop fuel correction for bank 1 or 2. This value is compared to thresholds to determine if the fuel adjustment system diagnostic is passing or failing or if an excess purge vapor test should be executed. |
| Long Term Fuel Trim Test Average without Purge | - | 0 % | This Parameter displays the filtered non purge long term closed loop fuel correction for bank 1 or 2. This value is compared to thresholds to determine if the fuel adjustment system diagnostic is passing, failing, or indeterminate during normal purge-OFF operation as well as during the intrusive excess purge vapor test. |
| Long Term Fuel Trim Test Average without Purge Bank 1 or 2 | - | 0 % | This Parameter displays the filtered non purge long term closed loop fuel correction for bank 1 or 2. This value is compared to thresholds to determine if the fuel adjustment system diagnostic is passing, failing, or indeterminate during normal purge-OFF operation as well as during the intrusive excess purge vapor test. |
| Low Engine Oil Level Indicator Command (If Equipped) | - | OFF | This parameter displays the commanded state of the low EOP lamp control circuit by the control module. |
| MAF Sensor | - | 3-6 g/s (varies with altitude) | The scan tool displays g/s. The scan tool displays a range of 0.0-655 g/s. The mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine. |
| MAF Sensor | - | 1,200-1,300 Hz (varies with altitude) | The scan tool displays a range of 0-65,555 Hz. The MAF sensor is a hot wire type air flow sensor. The ECM converts current draw needed by the MAF to keep the hot wires at a constant temperature into a frequency signal. The scan tool displays this frequency in a hertz signal. |
| Malfunction Counter | - | Counts | This parameter displays the number of ignition cycles with a failure reported since the first ignition cycle with a failure reported. |
| MAP Sensor | - | OK/Malfunction | MAP Test 1 Residual Out of Tolerance indicates that the filtered MAP Test 1 residual (the difference between the measured intake manifold pressure and the intake manifold pressure predicted from the intake manifold model using the mass airflow predicted from the throttle model) exceeds a failure threshold. |
| MAP Performance Test 2 | - | OK/Malfunction | MAP Test 2 Residual Out of Tolerance indicates that the filtered MAP Test 2 residual (the difference between the measured intake manifold pressure and the intake manifold pressure predicted from the intake manifold model using the measured mass airflow) exceeds a failure threshold |
| MAP Sensor | - | 20-42 kPa (varies with altitude) | The scan tool displays kPa. The MAP sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required. The scan tool displays a range of 10-240 kPa. |
| MAP Sensor | - | 0.80-1.30 V (varies with altitude) | The scan tool displays Volts. The MAP sensor measures the change in the intake manifold pressure which results from engine load and speed changes. As the intake manifold pressure increases, the air density in the intake also increases and additional fuel is required. The scan tool displays a range of 0-5 V. |
| MIL Command | - | OFF | This parameter displays the commanded state of the MIL control circuit. The malfunction indicator lamp should be on when the scan tool indicates the MIL Command is On. The malfunction indicator lamp should be off when the scan tool indicates the MIL Command is Off. The control module will command the MIL On when the ignition is ON with the engine OFF in order to perform a bulb check. |
| MIL Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the malfunction indicator lamp control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| MIL Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the malfunction indicator lamp control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| MIL Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the malfunction indicator lamp control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| MIL Requested by DTC | - | No | This parameter shows if the illumination of the MIL has been requested by a failed diagnostic trouble code (DTC). |
| O2S / HO2S Monitor Complete This Ignition Cycle | - | Varies | This parameter displays the completion status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| O2S / HO2S Monitor Enabled This Ignition Cycle | - | Varies | This parameter displays the enable status during the current driving/monitoring cycle of the non-continuous legislated emission related monitor. The states include Yes or No. |
| Output Shaft Speed Sensor | - | RPM | This Parameter displays the transmission output speed (the speed at the output of the gear box) determined from the speed measured by the transmission output speed (TOS) sensor. |
| Park/Neutral Switch | - | Park / Neutral | The scan tool displays the position of the transmission selection as Park/Neutral or In Gear. |
| Pass Counter | - | Counts | This parameter displays the number of ignition cycles with a pass reported and no failures reported since the first ignition cycle with a failure reported. |
| Power Enrichment | - | Inactive | The scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the ECM has detected conditions appropriate to operate in Power Enrichment mode. The ECM will command Power Enrichment mode when a large increase in throttle position and load is detected. While in Power Enrichment, the ECM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done to prevent a possible sag or hesitation from occurring during acceleration. |
| Reduced Engine Power | - | Inactive | The scan tool displays Active or Inactive. The scan tool displays Active when the ECM receives a signal from the TAC module that a throttle actuator control system fault is occurring. The ECM limits the engine power. |
| Remaining Fuel in Tank | - | Varies 0-100 % |
This parameter displays the amount of fuel remaining in the fuel tank as a percentage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full. |
| 0-61 Liters (0-16.2 gallons) | |||
| Short Term Fuel Trim Bank 1 or Bank 2 | - | -5 to +5 % | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor 1 or 2. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0. |
| Short Term Fuel Trim Test Average Bank 1 or Bank 2 | - | % | This Parameter display's the filtered short term closed loop fuel correction for bank 1 or 2. This value is compared to thresholds to determine if the fuel adjustment system diagnostic is passing or failing or if an excess purge vapor test should be executed. |
| Starter Relay Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the output driver for the starter relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to ground on the circuit. |
| Starter Relay Control Circuit Open Test Status | - | OK | This parameter displays the status of the output driver for the starter relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is an open in the circuit. |
| Starter Relay Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the output driver for the starter relay control circuit. The scan tool will display OK if the circuit is operating correctly or Not Run if a diagnosis has not been made. The scan tool will display Fault if there is a short to voltage on the circuit. |
| Starter Relay Command | - | OFF | The scan tool displays ON or OFF. This displays the commanded state of the starter relay by the ECM. |
| Ignition switch in the crank position | ON | ||
| Start-up ECT | - | Varies | Indicates the engine coolant temperature at engine start up. The scan tool displays a range of -40 to +150°C (-40 to +302°F). The scan tool displays the engine ECT at the time the engine was started. The ECM uses start-up ECT for certain DTCs. Used to determine if the last startup was a cold start. |
| Start-up IAT | - | Varies | Indicates the IAT at the time that the vehicle was started. Used to determine if the last startup was a cold start. The scan tool range is -40 to +132°C (-40 to +270°F). |
| 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 | - | % | This Parameter displays the commanded duty cycle for the throttle actuator output. |
| TCC/Cruise Control Brake Pedal Switch | - | Released | This parameter displays the state of the TCC/CRUISE Control Brake Pedal Switch. |
| Throttle Body Idle Air Flow Compensation | - | % | This Parameter displays the percent compensation of the Learned Airflow Variation Calibration. This value indicates the current amount of airflow compensation in response to engine intake airflow restrictions. It can also be used as feedback for the Learned Airflow Adapts Reset Trigger Device Control. |
| Total Knock Retard | - | 0 Degrees | This parameter indicates how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions. |
| Total Misfire | - | - | The scan tool range is 0-255 counts. This parameter indicates the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire or DTC P0300 has become active. The misfire history counter will update every 200 cylinder firing events. |
| Throttle Position | - | 6 % | This parameter displays the angle of the TP in percent. This information is calculated by the control module using the signals from the throttle position sensors. The scan tool will display a low percentage when the throttle plate is closed. The scan tool will display a high percentage when the throttle plate is fully open. |
| With Ignition On, Engine Off, Accelerator pedal not actuated | 29 % | ||
| With Ignition On, Engine Off, Accelerator pedal fully actuated | 100 % | ||
| Throttle Position Performance Test | - | OK | Throttle Position Residual Out of Tolerance indicates that the filtered throttle position residual (the product of the MAF residual and the MAP Test 1 residual) exceeds a failure threshold. |
| Throttle Position Sensor 1 | - | 4.06 V | This parameter displays the voltage signal sent to the control module from the sensor used to monitor the position of the throttle plate. This parameter is for sensor 1 of the TP sensor assembly. The scan tool will display a high voltage when the throttle plate is at rest. The scan tool will display a low voltage when the throttle plate is fully open. |
| With Ignition On, Engine Off, Accelerator pedal not actuated | 3.27 V | ||
| With Ignition On, Engine Off, Accelerator pedal fully actuated | 0.80 V | ||
| Throttle Position Sensor 1 or Learned Minimum | - | 0.69 V | This parameter displays the learned minimum voltage for TP sensor 1 as determined by the control module this ignition cycle. |
| Throttle Position Sensors 1 and 2 | - | Agree | This parameter displays the results of a control module test that compares the signals from the TP sensors 1 and 2. The scan tool will display Agree when the signal from TP sensor 1 corresponds with the signal from TP sensor 2. The scan tool will display Disagree when the signal from TP sensor 1 conflicts with the signal from TP sensor 2. |
| Throttle Position Sensor 2 | - | 0.90 V | This parameter displays the voltage signal sent to the control module from the sensor used to monitor the position of the throttle plate. This parameter is for sensor 2 of the TP sensor assembly. The scan tool will display a low voltage when the throttle plate is at rest. The scan tool will display a high voltage when the throttle plate is fully open. |
| With Ignition On, Engine Off, Accelerator pedal not actuated | 1.71 V | ||
| With Ignition On, Engine Off, Accelerator pedal fully actuated | 4.16 V | ||
| Throttle Position Sensor 2 Learned Minimum | - | 0.69 V | This parameter displays the learned minimum voltage for TP sensor 2 as determined by the control module this ignition cycle. |
| Throttle Position Sensor 2 Position | - | 10 % | This parameter displays the displacement determined from throttle position sensor 2 (corrected based upon its learned minimum position). |
| Torque Delivered Signal | - | N m | This Parameter displays the engine torque based upon the airflow through the engine and the torque losses due to spark retard and fuel shutoff. Since this is a steady state engine torque, it does not include the inertial component of engine torque. |
| Torque Management Ignition Timing Retard | - | Degrees | This Parameter displays the total spark retard (in terms of a crankshaft angle). |
| Transmission Fluid Temperature Sensor (If Equipped) | - | Varies | This parameter displays the transmission oil / fluid temperature measured by a sensor. In automatic transmission applications, this parameter is based upon the transmission fluid temperature sensor input to the TCM. |
| Vehicle Speed Output Circuit High Voltage Test Status | - | OK | This parameter displays the state of the vehicle speed output circuit. The parameter displays Fault if the vehicle speed output circuit is shorted to voltage. |
| Vehicle Speed Output Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the vehicle speed output circuit. The parameter displays Fault if the vehicle speed output circuit is shorted to ground. |
| Vehicle Speed Output Circuit Open Test Status | - | OK | This parameter displays the state of the vehicle speed output circuit. The parameter displays Fault if the vehicle speed output circuit is opened. |
| Vehicle Speed Sensor | - | 0 km/h/mph | The scan tool range is 0-200 km/h (0-125 mph). This parameter displays the vehicle speed. The ECM receives reference pulses from the vehicle speed sensor (VSS) and converts them into km/h and mph for display. |
| Warm-ups Since DTC Cleared | - | Varies | The scan tool displays a range of 0-255. This parameter counts the number of warm up cycles since a DTC was cleared from memory. The scan tool displays counts. |
| Warm Ups without Emission Malfunctions | - | Counts | This Parameter displays the number of OBD defined warm up cycles since the last emissions related (fault type A or B) fail report or MIL request. Emissions related DTCs are cleared from memory when this counter reaches 40. |
| Warm Ups without Non-Emission Malfunctions | - | Counts | This Parameter displays the number of OBD defined warm up cycles since the last non emissions related (fault type C) fail report. Non emissions related DTCs are cleared from memory when this counter reaches 40. |
| Wide Open Throttle | - | No | This parameter indicates the throttle status commanded by the control module. The scan tool will display YES if the vehicle throttle is commanded to wide open. The scan tool will display NO if the vehicle throttle is commanded to an amount less than 100 %. |
Engine Control Module Scan Tool Output Controls
| Output Control | Description |
|---|---|
| A/C Compressor Clutch Relay | Air Conditioning Compressor Clutch Enable; Air Conditioning Compressor Clutch ON |
| Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 40 crankshaft degrees. The scan tool initiates the test when the following conditions are met:
The system remains in the commanded state until cancelled by the scan tool. |
| Camshaft Position Actuator Solenoid Valve | This device control is used to override the state of the intake cam phase solenoid output. |
| Cooling Fan Relay 1 | This function activates the cooling fan relay 1. The normal commanded state of the fan relay is NONE. The relay command status can also be monitored on the scan tool data parameter FC Relay 1 Command. The control module allows cooling fan relay control when the following conditions are met:
|
| Cooling Fan Relay 2 & 3 | This function activates the cooling fan relay 2 and relay 3. The normal commanded state of the fan relays is NONE. The relay command status can also be monitored on the scan tool data parameter FC Relay 2 and 3 Command. The control module allows cooling fan relay control when the following conditions are met:
|
| Cooling Fan Relay 1, 2 & 3 | This function activates the cooling fan relay 1, 2 and 3. The normal commanded state of the fan relays is NONE. The relay command status can also be monitored on the scan tool data parameters FC Relay 1 Command and FC Relay 2 and 3 Command. The control module allows cooling fan relay control when the following conditions are met:
|
| Crankshaft Position Variation Learn | This device control is used to activate the crankshaft position variation learn algorithm which calculates the reference pulse correction factors for the misfire diagnostic. |
| Cylinder Deactivation System | This function control is used to deactivate half of the engines cylinders by commanding all of the Active Fuel Management solenoid outputs On. |
| Cylinder Power Balance | This function disables the selected fuel injector. The normal commanded state is None. The scan tool initiates the test when the following conditions are met:
If the fuel injector was disabled for 30 seconds, fuel injector control is not allowed again on the same fuel injector for 60 seconds. |
| Engine Controls Ignition Relay | This device control is used to override the state of the Powertrain Relay. |
| Engine Oil Life Reset | This function control contains the engine oil remaining life determined from an algorithm based upon the effective engine revolutions and the distance driven since the last oil change. This function control may be used to reset the engine oil remaining life to 100 % after an oil change or to any other value when replacing a control module |
| Engine Speed | Activates the throttle activation control (TAC) system to change engine RPM. The normal commanded state is None. To enable the RPM control, all instruction on the scan tool must be completed. The system will increase or decrease the RPM within a range of 400-2,000 RPM. The set step value changes the RPM by increments of 100 RPM.The system remains in the commanded state until cancelled by the scan tool. |
| EVAP Test | EVAP Service Test Trigger |
| EVAP Purge/Seal |
NOTE:
The EVAP Purge and Vent Solenoid Command parameters may not change states when using this output control. This function activates both the EVAP purge solenoid valve and EVAP vent solenoid to seal the EVAP system. When activated, the purge valve is commanded to 0 % and the vent valve is commanded ON, Not-venting. The normal commanded state for both solenoids is None. Both of the solenoids remain in the commanded state until cancelled by the scan tool or the FTP sensor exceeds -24 mm Hg (-12 inch H20). |
| EVAP Purge Solenoid Valve |
NOTE:
The EVAP Purge Solenoid Command parameter may not change states when using this output control. Activates the purge solenoid in 10 % increments from 0 to 100 %. The device control will be aborted and inhibited if the fuel tank pressure (FTP) sensor exceeds -27 mm Hg (-14 in H2O). |
| EVAP Vent Solenoid Valve |
NOTE:
The EVAP Vent Solenoid Command parameter may not change states when using this output control. This function controls the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to Not-venting. The system remains in the commanded state unless one of the following conditions occur:
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| EVAP System | Simultaneously activates the purge solenoid in 10 % increments from 0 to 100 % and the vent solenoid. The device control will be aborted and inhibited if the FTP sensor exceeds -27 mm Hg (-14 in H2O). |
| Fuel Control 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. |
| Fuel Injector Balance Test | This function enables the fuel injector in order to verify the correct fuel injector flow. The ECM will pulse the selected fuel injector when the following conditions are met:
The selected fuel injector can only be flowed/pulsed once per ignition cycle. |
| Fuel Pump Relay | Activates the fuel pump relay for 2 seconds. Also turns fuel pump ON and OFF. |
| Fuel Trim Enable | Disables the ECMs 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. |
| Generator L-Terminal | Generator L-Terminal Enable; Generator L-Terminal ON |
| HO2S Heater Bank 1 Sensor 1 | This device control is used to override the duty cycle of the oxygen sensor heaters. With the engine running, this device control is intended to be used as a discrete control for circuit diagnosis. With the engine OFF, none of the oxygen sensor heaters can be commanded ON for more than 3.0 seconds, after which the selected oxygen sensor heater must be disabled for a limited duration (typically 60 seconds) before it may be enabled again. With the engine running, this device control is used to operate the oxygen sensor heaters at the various duty cycles available to the engine controller. |
| HO2S Heater Bank 1 Sensor 2 | This device control is used to override the duty cycle of the oxygen sensor heaters. With the engine running, this device control is intended to be used as a discrete control for circuit diagnosis. With the engine OFF, none of the oxygen sensor heaters can be commanded ON for more than 3.0 seconds, after which the selected oxygen sensor heater must be disabled for a limited duration (typically 60 seconds) before it may be enabled again. With the engine running, this device control is used to operate the oxygen sensor heaters at the various duty cycles available to the engine controller. |
| HO2S Heater Bank 2 Sensor 1 | This device control is used to override the duty cycle of the oxygen sensor heaters. With the engine running, this device control is intended to be used as a discrete control for circuit diagnosis. With the engine OFF, none of the oxygen sensor heaters can be commanded ON for more than 3.0 seconds, after which the selected oxygen sensor heater must be disabled for a limited duration (typically 60 seconds) before it may be enabled again. With the engine running, this device control is used to operate the oxygen sensor heaters at the various duty cycles available to the engine controller. |
| HO2S Heater Bank 2 Sensor 2 | This device control is used to override the duty cycle of the oxygen sensor heaters. With the engine running, this device control is intended to be used as a discrete control for circuit diagnosis. With the engine OFF, none of the oxygen sensor heaters can be commanded ON for more than 3.0 seconds, after which the selected oxygen sensor heater must be disabled for a limited duration (typically 60 seconds) before it may be enabled again. With the engine running, this device control is used to operate the oxygen sensor heaters at the various duty cycles available to the engine controller. |
| HO2S Heater Learn | This device 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 Learn | This function allows the throttle position and the idle speed to be relearned by the ECM, once the following conditions have been met:
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| Idle Ignition Timing | Disables and enables idle spark advance with the engine running. |
| Ignition Timing Retard | This device control is used to retard the spark angle from the software calculated spark angle. For example, if the software calculated spark angle was 15 degrees advanced and this device control requested a 3 degree retard, the commanded spark angle that would be delivered would be 12 degrees advanced. |
| Malfunction Indicator Lamp | This function controls the malfunction indicator lamp (MIL). The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the MIL ON/OFF. The system remains in the commanded state until cancelled by the scan tool. |
| Misfire Graphic | This function clears the misfire graphics from the scan tool. |
| Remote Vehicle Start Disable History Reset | This function clears the remote vehicle start (RVS) disable history. When RESET is selected the reason the control module did not allow RVS in the last 8 attempts is cleared. |
| Reverse Inhibit Solenoid Actuator | This device control is used to override the state of the Reverse Inhibit output. |
| Skip Shift Solenoid Actuator | Activates the Skip Shift Solenoid |
| Starter Relay | Starter Relay Enable Starter Relay ON |
| Throttle Position | Operates TAC motor in 10 % increments to open or close the throttle blade. The test operates during key ON, engine OFF. |