Engine Control Module Scan Tool Information
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 may 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 for engine diagnosis.
Engine Control Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off/Brake Pedal Released | |||
| 5 V Reference 1, 2, 3, or 4 | Ignition ON | 5 V | This parameter displays the voltage sensed on the 5 V reference circuits 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 V Reference 1, 2, 3, or 4 Circuit Status | Ignition ON | OK | This parameter displays OK if there is no 5 V reference circuit condition. If the circuit is shorted to ground or shorted to B+, Fault is displayed. |
| A/C Disengage 1-8 History | A/C ON | Reason for A/C Disengagement | The parameter indicates the reason the air conditioning (A/C) compressor was disengaged. The scan tool displays None, A/C Pressure, Engine Speed, Battery Voltage, Anti Stall, RPM Unstable, wide open throttle (WOT), Launch Performance, Coolant Hot, Accelerator Pedal Position (APP), Air Bag Deploy, or A/C Relay DTC. |
| A/C High Side Pressure Sensor | A/C OFF | 0.75-1.5 V* | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. *Varies with temperature and relative humidity. |
| A/C ON | 1.3-2.5 V* | ||
| A/C High Side Pressure Sensor | A/C OFF | 450-650 kPa* (65-95 (PSI)* | This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module. *Varies with temperature and relative humidity. |
| Engine Speed at 2 000 RPM | 900-2 350 kPa* (162-341 PSI)* | ||
| A/C Off for WOT | A/C ON | No | This parameter displays whether the control module is commanding the A/C compressor clutch relay OFF for WOT. |
| A/C Disable - A/C Pressure Out of Range | A/C ON | No | This parameter displays whether the A/C pressure is out of range for normal operation as determined by the control module. |
| A/C Compressor Clutch Relay Control Circuit Open Test Status | A/C ON or Off | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| A/C Compressor Clutch Relay Control Circuit Low Voltage Test Status | A/C ON or Off | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| A/C Compressor Clutch Relay Control Circuit High Voltage Test Status | A/C ON or Off | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| A/C Compressor Clutch Relay Command | A/C ON | On | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
| A/C Request Signal | A/C ON | Yes | This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. |
| Accelerator Pedal Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP as calculated by the control module using the signals from the APP sensors. |
| Accelerator pedal fully actuated | 100% | ||
| Air/Fuel Equivalence Ratio Command | - | Varies | This parameter displays the ratio of air to fuel as calculated by the control module based on various sensor inputs. The scan tool will display a lower air fuel ratio when a richer air to fuel mixture is commanded. The scan tool will display a higher air fuel ratio when a leaner air to fuel mixture is commanded. In closed loop operation the air fuel ratio should normally be approximately 14.7:1. |
| Ambient Air Temperature | - | °C (°F) Varies |
This parameter displays the surrounding air temperature, at any given altitude. |
| Ambient Air Temperature When Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | 0°C (32°F) or less | This parameter displays Ambient Air temperature when recommended Ethanol concentration exceeded. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.88-1.08 V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 1 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 4.17-4.37 V | ||
| APP Sensor 1 Circuit Status | Ignition ON | OK Fault | APP Sensor 1 Out of Range indicates that the sensed accelerator pedal position 1 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 1 Learned Released Position | Ignition ON | Varies | This Parameter indicates the accelerator pedal sensor 1 signal at its minimum learned position (pedal released) as a percentage of its reference voltage. (The minimum learned position is automatically updated periodically as determined by the calibration. |
| APP Sensor 2 | Accelerator pedal not actuated | 0.39-0.59 V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 2 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 2.02-2.22 V | ||
| APP Sensor 2 Circuit Status | Ignition ON | OK Fault | APP Sensor 2 Out of Range indicates that the sensed accelerator pedal position 2 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 2 Learned Released Position | Ignition ON | Varies | This Parameter indicates the accelerator pedal sensor 2 signal at its minimum learned position (pedal released) as a percentage of its reference voltage. (The minimum learned position is automatically updated periodically as determined by the calibration. |
| 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 Sensors | - | 0% | 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 percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed. |
| APP Sensor 1 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 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% | ||
| BARO | - | 65-104 kPa (8-16 PSI) - Varies with altitude | This parameter displays the barometric pressure (BARO). The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences. |
| Brake Pedal Position Signal | - | Released | This parameter displays the serial data message of the brake position sensor signal from the electronic brake and traction control module. |
| Calculated Air Flow | - | g/s Varies | This parameter displays the air flow of the engine as calculated by the control module. |
| Calculated Catalyst Temperature | - | °C (°F) Varies |
This parameter displays the catalyst converter temperature as calculated by the control module. |
| Calculated Engine Oil Temperature | - | °C (°F) Varies |
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. |
| Camshaft Position Active Counter | - | 0-255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the camshaft position sensors. |
| Camshaft Position Sensor | - | Engine Speed | This parameter displays the speed of the engine as calculated by the signal from the camshaft position sensor, shown in RPM. |
| Catalyst Monitor Complete This Ignition Cycle | - | Yes or No | This parameter displays the monitor completion status during the current driving/monitoring cycle. |
| Catalyst Monitor Enabled This Ignition Cycle | - | Yes or No | This parameter displays the monitor enable status during the current driving/monitoring cycle. |
| Catalyst Monitor Not At Idle Test Conditions Met | - | Yes or No | This parameter displays the status of the catalyst monitor diagnostic. Off Idle Conditions Met indicates if the off idle conditions for the catalyst monitor diagnostic have been met. Once the Off Idle Conditions are met the vehicle can return to idle and allow the catalyst monitor diagnostic test to run. |
| Catalyst Monitor Test Counter | - | 0 Counts | This parameter displays the number of iterations of the catalyst monitor diagnostic test that have been performed since a code clear (used to determine if a sufficient number of tests have run to report a passing condition). |
| Catalyst Monitor Test Result | - | Varies | This parameter displays the status of the catalyst monitor diagnostic. |
| Catalyst Monitor Test State | - | Varies | 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. |
| 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 Start Fuel Injector Command | Engine Cranking | % | This Parameter displays the commanded duty cycle for the cold start fuel injector. |
| Cold Start Fuel Injector Control Circuit High Voltage Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel injector control circuit. The parameter displays Malfunction if the cold start fuel injector control circuit is shorted to voltage. |
| Cold Start Fuel Injector Control Circuit Low Voltage Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel injector control circuit. The parameter displays Malfunction if the cold start fuel injector control circuit is shorted to ground. |
| Cold Start Fuel Injector Control Circuit Open Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel injector control circuit. The parameter displays Malfunction if the cold start fuel injector control circuit is open. |
| Cold Start Fuel Pump Relay Command | Engine Cranking | ON | This parameter displays the engine control modules commanded state of the cold start fuel pump relay command control circuit. |
| Cold Start Fuel Pump Relay Control Circuit High Voltage Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel fuel relay control circuit. The parameter displays Malfunction if the cold start fuel fuel relay control circuit is shorted to voltage. |
| Cold Start Fuel Pump Relay Control Circuit Low Voltage Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel fuel relay control circuit. The parameter displays Malfunction if the cold start fuel fuel relay control circuit is shorted to ground. |
| Cold Start Fuel Pump Relay Control Circuit Open Test Status | Engine Cranking | OK/Malfunction/Not Run | This parameter displays the state of the cold start fuel fuel relay control circuit. The parameter displays Malfunction if the cold start fuel fuel relay control circuit is open. |
| Cold Start Up | - | 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 Command | - | % | This parameter displays the amount of cooling commanded by the ECM in % |
| Cooling Fan Relay 1 Control Circuit Open Test Status | - | OK or Not Run | This parameter displays the status of the fan relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cooling Fan Relay 1 Control Circuit Low Voltage Test Status | - | OK or Not Run | This parameter displays the status of the fan relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cooling Fan Relay 1 Control Circuit High Voltage Test Status | - | OK or Not Run | This parameter displays the status of the fan relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cooling Fan Relay 1 Command | - | Varies | 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 fan control relay 1 command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the fan control Relay 1 Command is OFF. |
| Cooling Fan Relay 2 Control Circuit Open Test Status | - | OK or Not Run | This parameter displays the state of the fan relay control circuit. The parameter displays Fault if the fan relay control circuit is open. |
| Cooling Fan Relay 2 Control Circuit Low Voltage Test Status | - | OK or Not Run | This parameter displays the status of the fan relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cooling Fan Relay 2 Control Circuit High Voltage Test Status | - | OK or Not Run | This parameter displays the status of the fan relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cooling Fan Relay 2 Command | - | Varies | 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 fan control Relay 2 command is ON. The cooling fan relay 2 should be OFF when the scan tool indicates the fan control Relay 2 command is OFF. |
| Crankshaft Position Active Counter | - | 0-255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position sensor. |
| Crankshaft Position Resynchronization Counter | - | 0 Counts | This parameter displays the number of counts the control module resynchronizes with the crankshaft position sensor. |
| Crankshaft Position Sensor | - | Engine Speed | This parameter displays the engine speed as calculated by the control module using the signal from the crankshaft position sensor. |
| Cruise Control | Cruise Control ON | Active/Inactive | This parameter displays the status of the cruise control system as determined by the control module. |
| Cruise Control Accelerate Switch | Cruise Control ON | Active/Inactive/Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the accelerate switch is pressed, the ECM detects a predetermined voltage value for this switch. |
| Cruise Control Cancel Switch | Cruise Control ON | Active/Inactive/Invalid | This parameter displays the status of the cruise control cancel switch. |
| Cruise Control Coast Switch | Cruise Control ON | Active/Inactive/Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the ECM detects a predetermined voltage value for the coast switch. |
| Cruise Control Disengage History 1-8 | Cruise Control ON | Reason for Cruise Disengagement | The parameter displays the last 8 cruise control disengages in order from 1-8, with 8 being the most recent. There are approximately 40 possible causes for the cruise control to disengage. |
| Cruise Control Inhibit Reason | Cruise Control ON | Varies | The parameter displays the reason why the cruise control system is inhibited. There are approximately 40 possible causes for the cruise control to be inhibited. |
| Cruise Control On/Off Switch | Cruise Control ON | ON/OFF | The engine control module (ECM) monitors the signal circuit of the cruise control switch. A closed switch is displayed as ON. |
| Cruise Control Resume Switch | Cruise Control ON | Active/Inactive/Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the resume switch is pressed, the ECM detects a predetermined voltage value for the resume switch. |
| Cruise Control Set Switch | Cruise Control ON | Active/Inactive/Invalid | The scan tool displays ON, when the cruise ON/OFF switch is ON and the ECM detects a predetermined voltage value for the set switch. |
| Cycles of Misfire Data | - | Incrementing 0-100 Counts | This parameter displays the number of cylinder firing events recorded by the control module. |
| Cylinder 1-4 Current Misfire Counter | - | 0 Counts | The scan tool displays 0-255 Counts. This parameter displays 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 1-4 History Misfire Counter | - | 0 Counts | The scan tool displays 0-255 Counts. The misfire history counters display 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 DTC P0300 00 has become active. The misfire history counters will update every 200 cylinder firing events. |
| Cylinder 1-4 Injector Control Circuit Open Test Status | - | OK | This parameter displays the state of the injector control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cylinder 1-4 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 1-4 Injector Control Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the injector control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cylinder 1-4 Injector Control Circuit High Voltage Test Status | - | OK | This parameter displays the state of the injector control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Cylinder 1-4 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. |
| Deceleration 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. |
| Desired ECT | - | °C (°F) Varies |
This parameter displays the desired engine coolant temperature (CT) in °C (°F). |
| Desired Idle Speed | - | 600-950 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
| Desired Throttle Position | - | 2-6% | This parameter displays the desired throttle position angle commanded by the control module. |
| 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 | Ignition ON | 0 km/h (0 MPH) | This parameter displays in kilometers or miles the distance traveled since a Malfunction occurred. |
| Distance Since Last Malfunction | - | Varies | This parameter displays the distance accumulated when the emission diagnostic trouble code last failed. |
| Distance Since Last Oil Pressure Warning | Ignition ON | 0 km/h (0 MPH) | This parameter displays in kilometers or miles the distance traveled since the last oil pressure warning Malfunction occurred. |
| Distance Since Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | 0 km/h (0 MPH) | This parameter displays in kilometers or miles the distance driven since the most recent time that the Recommended Ethanol Concentration Exceeded occurred. |
| Distance This Driving Cycle | Ignition ON | 0 km/h (0 MPH) | This parameter displays in kilometers or miles the distance driven during this ignition cycle. |
| ECM Authentication Status | Ignition ON | Unknown/Incorrect/Negative Response/Valid | ECM Authentication Status indicates the result of the comparison between the last received immobilizer response and the expected response calculated into the ECM. |
| ECM Response Source | Ignition ON | Ignition Switch Start/Remote Vehicle Start/Exterior Power Take Off (PTO) Vehicle Start | ECM Response Source indicates the source used to calculate the ECM response. |
| ECT Sensor | - | -39 to +140°C (-38 to +284°F) Varies |
This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor. |
| Engine Controls Ignition Relay Control Circuit Open Test Status | - | Not Run | This parameter displays the state of the engine control ignition relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Engine Controls Ignition Relay Control Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the engine control ignition relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Engine Controls Ignition Relay Control Circuit High Voltage Test Status | - | Not Run | This parameter displays the state of the engine control ignition relay control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Engine Controls Ignition Relay Command | - | ON | This parameter displays the commanded state of the engine control ignition relay control circuit. The scan tool will display ON or OFF. ON indicates the engine control ignition relay control circuit is being grounded by the control module, allowing voltage to other control module circuits and systems. OFF indicates the engine control ignition relay is not being commanded ON by the control module. |
| Engine Controls Ignition Relay Feedback Signal | - | B+ | This parameter displays the voltage available at the engine control ignition relay pin of the control module. |
| Engine Load | Engine Idling | 11-30% Varies |
This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors. |
| Engine speed at 2 500 RPM | 25-40% | ||
| Engine Off Time | Ignition Switch in the OFF Position | Varies | This parameter displays the amount of time that has elapsed since the engine was last cycled OFF. The scan tool displays the time in hours, minutes, and seconds. The engine OFF time will reset to zero when the engine starts. |
| Engine Oil Life Remaining | Ignition ON | 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 | - | 1-2 kPa (0.16-0.29 PSI) | This parameter displays the actual engine oil pressure as measured by engine oil pressure sensor |
| Engine Oil Pressure Switch | - | OK | 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 displays Low when the engine oil pressure is below a predetermined value. |
| Engine Run Time | Engine Operating | 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 | Engine Cranking | Greater than 60 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position sensor. |
| Engine Idling | Approximately 650-950 RPM | ||
| Engine Torque Command | - | N.m | This parameter displays the estimated amount of torque that is delivered from the engine. The scan tool displays engine torque in N.m (lb ft). |
| EVAP Malfunction History | - | No Fault | This Parameter displays the reason of EVAP malfunctioning. The scan tool displays No Fault/Excess Vacuum/Purge Valve Leak/Small Leak/Weak Vacuum/No Test Result |
| EVAP Monitor Complete This Ignition Cycle | - | Yes/No | This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle. |
| EVAP Monitor Enabled This Ignition Cycle | - | Yes/No | This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle. |
| EVAP Purge Solenoid Valve Control Circuit Open Test Status | - | OK | This parameter displays the status of the evaporative emission (EVAP) purge solenoid control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the evaporative emission (EVAP) purge solenoid control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the evaporative emission (EVAP) purge solenoid control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| EVAP Purge Solenoid Valve Command | - | 10-20% | This parameter displays the on-time or duty cycle of the EVAP canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge. |
| EVAP Vent Solenoid Valve Command | - | Venting | This parameter displays the state of the EVAP canister vent solenoid commanded by the control module. The scan tool displays Venting or Not Venting. |
| Exhaust Camshaft Position Active Counter | - | 0-255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the exhaust camshaft position sensor. |
| Extended Travel Brake Pedal Position Signal | Brake pedal released | Released | This parameter displays the position of the brake pedal. The scan tool displays Applied/Released/Invalid |
| Fuel Alcohol Content | Ignition ON | % | This parameter displays the percentage of alcohol contained in ethanol fuels, if equipped. |
| Fuel Alcohol Content When Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | % | This Parameter displays the actual fuel alcohol percentage at the most recent time that the Recommended Ethanol Concentration Exceeded became true. If a Recommended Ethanol Concentration Exceeded event has not taken place this Parameter shall default to zero |
| Fuel Consumed Since Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | Liters | This Parameter displays the amount of fuel consumed since the most recent time that the Recommended Ethanol Concentration |
| Fuel Control Loop Status | - | Closed Loop | 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. |
| Fuel Economy | Engine Idling | Liters per Hour | This Parameter displays the instant fuel consumption rate of the engine in liters per hour. |
| Fuel Enrichment - Hot Catalyst | - | No | This parameter displays if the control module is commanding catalyst converter protection. |
| Fuel Enrichment - Hot Coolant | - | Inactive | This parameter displays 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 condition. The scan tool will display Inactive if the fuel system is operating normally. |
| Fuel Level Sensor | - | 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 in the tank. The scan tool will display a low reading when the fuel level in the tank is near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full. |
| Fuel Tank Pressure Sensor | - | Varies | This parameter displays the pressure/vacuum inside the fuel tank. A negative value indicates a vacuum, while a positive value indicates a pressure. |
| Fuel Tank Pressure Sensor | - | 1.3-1.7 V | This parameter displays the voltage signal received by the control module from the fuel tank pressure sensor. |
| Fuel Tank Rated Capacity | - | 70 L (18.4 Gal) | 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 Memory 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 closer to idle, and a higher number as conditions approach maximum engine speed and maximum load. |
| Fuel Trim Learn | - | Enabled | This parameter displays Enabled when conditions are appropriate for enabling long term fuel trim corrections. This indicates that the long term fuel trim is adapting continuing amounts of short term fuel trim. If the scan tool displays Disabled, then long term fuel trim will not respond to changes in short term fuel trim. |
| 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 | - | Low | This parameter indicates the state of fuel volatilization. The scan tool displays Low, Moderate or High. |
| HO2S 1 or HO2S 2 | Ignition ON, Engine OFF | 50-900 mV | This parameter indicates the heated oxygen sensor (HO2S) sensor 1 or 2, output voltage as measured by the control module. The scan tool will display a higher value during a rich condition, and a lower value during a lean condition. |
| Engine Operating | Varies | ||
| HO2S 1 or HO2S 2 Heater | - | 0.42-0.62 A | This parameter displays the amperage of the HO2S heater commanded by the control module. |
| HO2S 1 or HO2S 2 Heater Command | - | ON | This parameter displays the commanded state of the HO2S 1 or HO2S 2 heater circuit 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 1 or HO2S 2 Heater Command | - | 0-99% | This parameter displays the commanded state of the HO2S 1 or HO2S 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 1 or HO2S 2 Heater Control Circuit Open Test Status | - | OK | This parameter displays the status of the control circuit for the HO2S 1 or HO2S 2. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| HO2S 1 or HO2S 2 Heater Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the HO2S 1 or HO2S 2. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| HO2S 1 or HO2S 2 Heater Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the HO2S 1 or HO2S 2. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| HO2S Heater Monitor Complete | Engine Idling | Yes/No | This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle. |
| HO2S Heater Monitor Complete This Ignition Cycle | - | Yes or No | This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle. |
| HO2S Heater Monitor Enabled | Engine Idling | Yes/No | This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle. |
| HO2S Heater Monitor Enabled This Ignition Cycle | - | Yes or No | This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle. |
| IAT Sensor | - | -39 to +140°C (38 to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
| IAT Sensor 1 | - | -39 to +140°C (38 to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
| IAT Sensor 2 | - | -39 to +140°C (38 to +284°F) | This parameter displays the temperature of the air after the turbocharger and the charge air cooler, before it enters the intake manifold. Intake air temp is used by the ECM to adjust fuel delivery and spark timing according to incoming air density. |
| Ignition 1 Signal | - | B+ | This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal. |
| Ignition Accessory Signal | - | ON | This parameter displays the state of the ignition accessory position input to the control module from the ignition switch. |
| Ignition Timing | - | -4 to +15° | This parameter displays the amount of spark advance the control module is commanding. The control module determines the desired advance. |
| Ignition Coil 1 and 4 Control Circuit Open Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Coil 1 and 4 Control Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Coil 1 and 4 Control Circuit High Voltage Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Coil 2 and 3 Control Circuit Open Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Coil 2 and 3 Control Circuit Low Voltage Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Coil 2 and 3 Control Circuit High Voltage Test Status | - | OK | This parameter displays the state of the Ignition control circuit. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Ignition Cycles Since Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | Counts | This Parameter displays the number of ignitions cycles since the most recent time that the Recommended Ethanol Concentration Exceeded failed. This Parameter value will reset when a code clear is performed. If a Recommended Ethanol Concentration Exceeded event has not taken place (either initially or after a code clear), this Parameter defaults to zero. |
| Ignition Cycles with Malfunction Since 1st Malfunction | Ignition ON | Counts | This Parameter contains the number of ignition cycles with a malfunction reported since the first ignition cycle with a malfunction reported. |
| Ignition Cycles without Malfunction Since Last Malfunction | Ignition ON | Counts | This Parameter contains the number of ignition cycles with a pass reported and no malfunctions reported since the first ignition cycle with a malfunction reported |
| Injector Duty Cycle | - | 1.5-3 ms | This parameter displays the average pulse width of the fuel injectors as determined by the control module. |
| Intake Camshaft Position Active Counter | - | 0-255 Counts | This parameter displays an incrementing counter when the control module receives a signal from the intake camshaft position sensor. |
| Intake Manifold Pressure | - | 32-53 kPa (4.6-7.6 PSI) | This parameter displays the pressure difference between the Manifold Absolute Pressure (MAP) and the barometric pressure (BARO) as calculated by the control module. |
| Knock Retard | - | 0° | This parameter displays the amount of spark advance the control module removes from the ignition control spark advance in response to the signal from the knock sensors. |
| Long Term Fuel Trim | - | -10 to +10% | The scan tool range is -99 to +99%. This parameter indicates the Long Term fuel trim correction as commanded by the ECM. A change made to the fuel delivery will be indicated by the Long and Short Term values. The Short Term values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term values change in response to the changes in the Short Term. The Long Term makes coarse adjustments to the fueling in order to recenter and restore control to the Short Term. The Short Term and the Long Term can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition. |
| Long Term Fuel Trim Test Average | - | 0.98% Varies |
This parameter is the average long term fuel trim for this bank as calculated by the control module. The scan tool will display a value more than 0% indicating that time is being added to the injector pulse width, increasing the amount of fuel to this bank of the engine. The scan tool will display a value of less than 0, indicating time is being subtracted from the injector pulse width, reducing the amount of fuel to this bank of the engine. A value of 0% indicates no compensation is required to operate the engine at the desired air/fuel ratio. |
| Long Term Fuel Trim Test Average without Purge | - | 1.02% Varies |
This parameter is calculated by the control module based on the Short Term Fuel Trim value. The Long Term Fuel Trim is used for the long term correction of the fuel delivery. The scan tool will display a high value for a large amount of long term fuel correction, and 0% 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. |
| Low Engine Oil Pressure Indicator Command | - | OFF | This parameter displays the state of the low engine oil pressure indicator as commanded by the control module. |
| 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 condition is detected. The scan tool will display Fault if the control module detects a condition during the test. |
| MAF Sensor | Engine Idling | 1.7-3.7 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 | 5.5-7.5 g/s | ||
| MAF Sensor | - | 1 700-2 100 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 | - | 26-52 kPa (3.7-7.6 PSI) | This parameter displays the pressure from the MAP sensor to the control module. |
| MAP Sensor | - | 0.98-1.42 V | This parameter displays the signal voltage from the MAP sensor to the control module. |
| MIL Command | Ignition ON | ON/OFF | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the engine control module (ECM). |
| MIL Control Circuit Open Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp control (MIL). The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| MIL Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp control (MIL). The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| MIL Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp control (MIL). The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| 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. |
| MIL Requested by DTC | Ignition ON | Yes/No | This parameter indicates the reason the engine 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 Monitor Complete This Ignition Cycle | - | Yes or No | This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle. |
| Misfire Monitor Enabled This Ignition Cycle | - | Yes or No | This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle. |
| Number of DTC(s) | - | 0 | This parameter indicates the number of diagnostic trouble codes (DTCs). |
| O2S/HO2S Monitor Complete | Engine Idling | Yes/No | This Parameter displays the enable and completion status during the current driving/monitoring cycle of each continuous legislated emission related monitor and non continuous legislated emission related monitor. |
| O2S/HO2S Monitor Complete This Ignition Cycle | - | Yes/No | This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle. |
| O2S/HO2S Monitor Enabled | Engine Idling | Yes/No | This Parameter displays the enable and completion status during the current driving/monitoring cycle of each continuous legislated emission related monitor and non continuous legislated emission related monitor. |
| O2S/HO2S Monitor Enabled This Ignition Cycle | - | Yes/No | This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle. |
| Output Shaft Speed Sensor | Vehicle needs to be moving | 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 sensor. |
| Park/Neutral Position Switch | - | Park/Neutral | This parameter displays the position of the transmission selection as Park/Neutral or in gear. |
| Power Enrichment | - | Inactive | This parameter displays the status of the operating mode of the control module used to increase fuel delivery during certain acceleration conditions. |
| Power Mode | Ignition ON | OFF/Accessory/Run/Crank Request | This Parameter displays the state of the System Power Mode. This signal is based upon the state of the system power mode received over serial communication from the vehicle electronics. If the serial data signal not received, the Parameter will display OFF. |
| Recommended Maximum Fuel Alcohol Content | Engine Idling | % | Recommended Ethanol Concentration Exceeded indicates that the fuel alcohol percentage has exceeded the recommended value for vehicle conditions. |
| Recommended Maximum Fuel Alcohol Content Exceeded | Engine Idling | Yes/No | Recommended Ethanol Concentration Exceeded indicates that the fuel alcohol percentage has exceeded the recommended value for vehicle conditions. |
| Recommended Maximum Fuel Alcohol Content When Recommended Maximum Fuel Alcohol Content Exceeded | Engine Idling | % | displays the recommended fuel alcohol percentage for vehicle conditions at the most recent time that the Recommended Ethanol Concentration Exceeded failed. This Parameter value will lock in until a code clear is issued to the controller. If a Recommended Ethanol Concentration Exceeded event has not taken place (either initially or after a code clear), this Parameter shall default to zero. |
| Reduced Engine Power | - | Inactive | This parameter displays the status of the operating mode of the control module used to reduce engine power to prevent catalyst converter or engine damage or due to a Throttle Actuator Control (TAC) system condition. |
| Reduced Engine Power History | - | OK | This parameter displays the last reason that ECM has Commanded Reduced Engine Power. The scan tool displays one of the following when Reduced Engine Power is commanded:
|
| Refueling Events Since Recommended Maximum Fuel Alcohol Content Exceeded | Ignition ON | Counts | This Parameter displays the number of times the vehicle has been refueled since the most recent time that the Recommended Ethanol Concentration Exceeded failed. This Parameter value will reset when a code clear is issued to the controller. If a Recommended Ethanol Concentration Exceeded event has not taken place (either initially or after code clear), this Parameter defaults to zero. |
| Remaining Fuel in Tank | - | Liters (Gallons) Varies |
This parameter displays the amount of fuel remaining in the fuel tank as measured in liters (gallons). The control module determines the amount of fuel remaining in the tank by using information from the fuel level sensor. The scan tool will display a higher value with a full fuel tank, and a lower value with an empty fuel tank. |
| Remaining Fuel in Tank | - | 0-100% 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. |
| Short Term Fuel Trim | - | -10 to +10% | The Short Term values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The Long Term values change in response to the changes in the Short Term. The Long Term makes coarse adjustments to the fueling in order to recenter and restore control to the Short Term. The Short Term and the Long Term can be monitored with a scan tool. A positive fuel trim value indicates that the ECM is adding fuel in order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate for a rich condition. |
| Short Term Fuel Trim Test Average | - | -3 to +99% Varies |
This parameter displays the short term closed loop fuel correction. This value is compared to predetermined thresholds to determine if the fuel trim diagnostic is passing or failing. |
| Start Up ECT | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the engine coolant on start up based on input to the control module from the ECT sensor 1. |
| Start Up IAT | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the intake air at start in the air induction system based on input to the control module from the IAT sensor. |
| Starter Relay Control Circuit Open Test Status | - | OK | This parameter displays the status of the control circuit for the starter relay. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Starter Relay Control Circuit Low Voltage Test Status | - | Not Run | This parameter displays the status of the control circuit for the starter relay. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Starter Relay Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the starter relay. The scan tool displays OK, Fault, or Not Run. OK indicates that no circuit faults are detected during the current test. |
| Starter Relay Command | - | OFF | The scan tool displays ON or OFF. The scan tool displays OFF until the ignition is placed into the CRANK position. |
| 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 | - | Disabled | 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 | - | 0-100% Varies |
This parameter displays the percentage of the commanded state of the TAC motor by the control module. |
| Throttle Body Idle Air Flow Compensation | - | 0-100% Varies |
This parameter displays the amount of airflow compensation in response to engine intake air flow restrictions. For example, throttle plate coking. |
| Throttle Position | - | 2-9% | This parameter displays the actual throttle position angle indicated by the control module using information from the two Throttle Body sensors. |
| Throttle Position Performance Test | - | OK | This parameter displays the status of the throttle position 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. |
| Throttle Position Sensor 1 | Accelerator pedal not actuated | 4.14-4.34 V | This parameter displays the voltage signal sent to the control module from throttle position sensor 1 of the throttle assembly. The throttle position 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. |
| Accelerator pedal fully actuated | 3.50-3.37 V | ||
| Throttle Position Sensor 1 Position | - | 2-6% | This parameter displays the angle of the throttle position sensor 1 as calculated by the control module using the signal from the throttle position sensor 1. The throttle position 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. |
| Throttle Position Sensor 1 Learned Minimum | - | 0.5-0.71 V | This parameter displays the learned minimum voltage for throttle position sensor 1 as determined by the control module this ignition cycle. |
| Throttle Position Sensor 2 | Accelerator pedal not actuated | 0.68-0.88 V | This parameter displays the voltage signal sent to the control module from throttle position sensor 2 of the throttle assembly. The throttle position 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. |
| Accelerator pedal fully actuated | 1.35-1.55 V | ||
| Throttle Position Sensor 2 Position | - | 2-6% | This parameter displays the angle of the throttle position sensor 2 as calculated by the control module using the signal from the throttle position sensor 2. The throttle position 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. |
| Throttle Position Sensor 2 Learned Minimum | - | 0.55-0.75 V | This parameter displays the learned minimum voltage for throttle position sensor 2 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 Throttle Body sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that throttle position sensor 1 and throttle position sensor 2 voltages correspond to the same throttle position. Disagree indicates that throttle position sensor 1 and throttle position sensor 2 voltages correspond to different throttle positions. |
| Torque Management Ignition Timing Retard | - | 15-25° | This parameter displays 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 Request Inhibit - Fuel | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - Ignition Timing | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - Ignition Timing Advance | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - Minimum Idle | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - Minimum Torque | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - TAC | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Torque Request Inhibit - TAC Limit | Engine Idling | Yes/No | This Parameter displays the existing condition in the ECM causing the transmission torque request to be limited. |
| Total Knock Retard | - | 0° | This parameter displays 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 Counts | This parameter displays the total number of cylinder firing events that the control module detected as misfires for the last 200 crankshaft revolution sample period. |
| Vehicle Speed Sensor | - | 0 km/h (0 MPH) | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor. |
| VIN Programming Counter | Ignition ON | Counts | This Parameter displays the number of times the VIN has been programmed. This counter can only be incremented. |
| Warm-ups Since DTC Cleared | - | Varies | This parameter displays the number of warm-ups since the DTC was cleared in counts. |
| Warm-Ups without Emission Malfunctions | - | Varies | This parameter displays 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 without Non Emission Malfunctions | - | Varies | This parameter displays 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 displays 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%. |
Engine Control Module (ECM) Scan Tool Output Controls
| Output Control | Description |
|---|---|
| A/C Compressor Clutch Relay | This function activates the A/C compressor relay. The normal commanded state of the A/C relay is None. The A/C compressor will turn ON or OFF when commanded ON or OFF. The system remains in the commanded state until cancelled by the scan tool. The scan tool initiates the test when the following conditions are met:
|
| Cold Start Fuel Injector | This device control is used to trigger the cold start injector to be commanded on for a calibratable amount of time in order to confirm injector driver operation and circuit integrity or test the flow of the injector. |
| Cold Start Fuel Pump | This device control is used to override the state of the fuel pump output for an auxiliary cold start fuel reservoir for circuit or pressure diagnosis. The device control is a service diagnostic aid that is used to determine if the on/off relay controlled fuel pump system is functioning properly. |
| Cold Start System | This device control is used to override the state of the full auxiliary cold start system. This device control will operate the auxiliary cold start reservoir fuel pump and injector in such a way as to mimic in use control, which will allow service and assembly testing. |
| Compression Test | This device control is used to set up the internal combustion engine for a compression test. The fuel pump, fuel injectors, and spark are all disabled. The throttle is opened to a WOT position. For conventional engine vehicles, the extended crank feature is not active. Engine cranking is completely controlled by the technician either through the ignition key or through a remote starter switch as applicable. The device control limits and rejects will apply normally upon entry to the device control. Once the device control is active, the limits will be monitored (to prevent unwanted starter operation, for example), but in the case of a limit exceeded or a tester disconnect, device control of the fuel and spark will not be released until the Power Mode switches to Accessory or OFF. This will prevent unexpected fuel and spark operation in the case of a device control abort. |
| Cooling Fan Relay 1 | This function controls the cooling fan relay 1. The normal commanded state of the fan relay is None. The scan tool initiates the test when the following conditions are met:
|
| Cooling Fan Relay 2 | This function controls the cooling fan relay 2. The normal commanded state of the fan relay is OFF. The scan tool initiates the test 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 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 is disabled after 30 s, fuel injector control is not allowed again on the same fuel injector for 60 s. |
| Engine Controls Ignition Relay | This function controls the engine control ignition relay or main 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. The scan tool initiates the test when the following conditions are met:
|
| Engine Oil Life Reset | This function is used to reset the engine oil life. The engine oil remaining life is determined from engine revolutions and the distance driven since the last oil change. |
| Engine Speed | This function controls the idle speed override in 25 RPM, 100 RPM, and 500 RPM increments, from the base idle speed to 1 950 RPM. The scan tool initiates the test when the following conditions are met:
|
| EVAP Purge Solenoid Valve | This function controls the EVAP purge solenoid valve. The normal commanded state is None. The system will increase or decrease the amount of purge by changing the duty cycle of the purge valve in 10% increments within a range of 0-100%. The scan tool initiates the test when the following conditions are met:
|
| EVAP Vent Solenoid Valve | This function controls the EVAP vent solenoid. The normal commanded state is none. When commanded ON, the vent valve switches to not venting. When commanded OFF, the vent valve switches to venting. The scan tool indicates the test when the following conditions are met:
|
| Fuel Composition Reset |
NOTE:
When replacing controller, value should be retrieved from original controller and programmed into new controller. If value cannot be retrieved, it will have to be manually entered. This output control will reset the ECM learned alcohol content percentage to a preset valve. |
| Fuel Control Loop Status | This device control is used to enable or disable closed loop fuel control. |
| Fuel Injector Balance | This function 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 or pulsed once per ignition cycle. |
| Fuel Trim Enable | This function enables or disables the ECM fuel trim learning. The normal commanded state is None. |
| Fuel Trim Reset | This function is used to reset the learned fuel trim values to their initial values. |
| HO2S Heater Learn | This function is used to trigger the reset of the learned resistances for the oxygen sensor heaters following a replacement. 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. |
| HO2S Heater Sensor 1 or 2 | This function controls the selected HO2S heater. The normal commanded state is None, on, and off. Commanding the HO2S heater ON turns on the heater driver. The scan tool initiates the test when the following conditions are met:
|
| HO2S Test | This device control is used to trigger a service bay procedure to execute the oxygen sensor response test following a sensor replacement in service. This procedure is required to set the oxygen sensor inspection and maintenance ready flag. |
| Idle Ignition Timing | Disables and enables idle spark advance with the engine running. |
| Idle Learn | This function is used to reset the learned airflow adaptive values to the initial values. The scan tool initiates the test when the following conditions are met:
|
| Idle Speed Adjustment | This device control allows a service technician to add an offset to the engine idle speed within a restricted range to address customer complaints for vehicle vibration. |
| Ignition Timing Retard | This function is used to control the amount of spark retard. The normal commanded state is None. The system will increase or decrease the amount of spark retard by 1° increments within a range of 0-10° maximum retard. The system remains in the commanded state until cancelled by the tool. |
| Malfunction Indicator Lamp (MIL) | This function controls the malfunction indicator lamp (MIL). The normal commanded state is None. When commanded ON or OFF, the ECM turns the malfunction indicator lamp (MIL) ON or OFF. This output can also be monitored on the scan tool data parameter MIL Command. The system remains in the commanded state until cancelled by the scan tool. |
| Misfire Graphic | This function is used to graph the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph. |
| Programming History | This function displays the history buffer entries for the primary calibration part in the engine controller. |
| Starter Relay | This function 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. The scan tool initiates the test when the following conditions are met:
|
| Throttle Position | This function controls the throttle valve in 10% 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. |