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| Table 1: | Engine Control Module Scan Tool Data Parameters |
| Table 2: | Engine Control Module (ECM) Scan Tool Output Controls |
Engine Control Module Scan Tool Data Parameters
Engine Control Module (ECM) Scan Tool Output Controls
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) are set. |
| • | 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 for engine diagnosis.
Parameter | System State | Expected Value | Description |
|---|---|---|---|
5V Reference 1, 2, or 3 Circuit Status | -- | OK | This parameter will display OK if the circuit is good or Fault if a short to ground, short to B+ or open circuit is present. |
A/C 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 Clutch Relay Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is shorted to voltage. |
A/C Clutch Relay Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is shorted to ground. |
A/C Clutch Relay Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is open. |
A/C Evap. Temperature | - | -39 to +214°C (-38 to +417°F) Varies | This parameter displays the temperature of the A/C evaporator based on input to the control module from the A/C evaporator temperature sensor. |
A/C Off for WOT | - | NO | This parameter displays whether the control module is commanding the A/C compressor clutch relay off for wide open throttle (WOT). |
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 position of the accelerator pedal as calculated by the control module using the signals from the APP sensors. |
Accelerator pedal fully actuated | 100% | ||
Air/Fuel Equivalence Ratio Command | - | Ratio 1.000:1 | This parameter displays the ratio of air to fuel as commanded by the control module based on various sensor inputs. The scan tool will display a lower than 1.0 air fuel ratio when a leaner air to fuel mixture is commanded. The scan tool will display a higher than 1.0 air fuel ratio when a richer air to fuel mixture is commanded. In closed loop operation the air fuel ratio should be reported as 1.0 to 1. |
Air/Fuel Ratio | - | Ratio 14.5:1 | This parameter displays the air to fuel ratio based on the oxygen sensor inputs. The engine control module (ECM) uses the fuel trims to adjust fuelling in order to attempt to maintain an air fuel ratio of 14.7:1. |
APP Sensor 1 | Accelerator pedal not actuated | 0.7-1.2V | 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 | 4.2-4.5V | ||
APP Sensor 1 and 2 | - | Agree | This parameter displays Disagree if the control module detects the signal voltage from APP sensor 1 is not in correct relationship to APP sensor 2. The scan tool displays Agree under the normal operating conditions. |
APP Sensor 1 Position | Accelerator pedal not actuated | 0% | This parameter displays the position of the accelerator pedal as calculated by the control module using the signal from the APP sensor 1. |
Accelerator pedal fully actuated | 100% | ||
APP Sensor 2 | Accelerator pedal not actuated | 0.3-0.5V | 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 | 2.2-2.5V | ||
APP Sensor 2 Position | Accelerator pedal not actuated | 0% | This parameter displays the position of the accelerator pedal as calculated by the control module using the signal from the APP sensor 2. |
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 Circuit Signal | - | Released | This parameter displays the state of the brake pedal position as determined by the brake lamp switch. The scan tool will display Applied when the brake pedal is depressed, and Released when the brake pedal is not depressed. |
Calculated Air Flow | - | 1.0-3.0 g/s | This parameter displays the calculated air flow into the engine that is based on manifold absolute pressure. The calculation is used in several diagnostics to determine when to run the diagnostics. |
Control Module Voltage Signal | -- | B+ | This parameter displays the state of the ignition system voltage available at the control module. |
Cooling Fan Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 1 control circuit. The parameter displays Fault if the cooling fan relay 1 control circuit is shorted to voltage. The parameter displays Not Run until the circuit has been commanded ON. |
Cooling Fan Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 1 control circuit. The parameter displays Fault if the cooling fan relay 1 control circuit is shorted to ground. The parameter displays Not Run until the circuit has been commanded ON. |
Cooling Fan Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 1 control circuit. The parameter displays Fault if the cooling fan relay 1 control circuit is open. The parameter displays Not Run until the circuit has been commanded ON. |
Cooling Fan Relay 1 Command | -- | Varies | This parameter displays the commanded state of the fan relay 1 control circuit. The cooling fan relay 1 should be ON when the scan tool indicates the Cooling Fan Relay 1 Command is ON. The cooling fan relay 1 should be OFF when the scan tool indicates the Cooling Fan Relay 1 Command is OFF. |
Cooling Fan Relay 2 Command | -- | Varies | This parameter displays the commanded state of the fan relay 2 control circuit. The cooling fan relay 2 should be ON when the scan tool indicates the Cooling Fan Relay 2 Command is ON. The cooling fan relay 2 should be OFF when the scan tool indicates the Cooling Fan Relay 2 Command is OFF. |
Cooling Fan Relay 2 Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 2 control circuit. The parameter displays Fault if the cooling fan relay 2 control circuit is shorted to voltage. The parameter displays Not Run until the circuit has been commanded ON. |
Cooling Fan Relay 2 Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 2 control circuit. The parameter displays Fault if the cooling fan relay 2 control circuit is shorted to ground. The parameter displays Not Run until the circuit has been commanded ON. |
Cooling Fan Relay 2 Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the cooling fan relay 2 control circuit. The parameter displays Fault if the cooling fan relay 2 control circuit is open. The parameter displays Not Run until the circuit has been commanded ON. |
Crankshaft Position Variation Learn Status | - | Complete | This parameter displays the state of the crankshaft position variation learn. The parameter displays Complete if the crank angle sensing errors have been learned during the current key cycle. The parameter displays Not Complete if the crank angle sensing errors have not been learned during the current key cycle. |
Cylinder 1-4 Current Misfire Counter | - | 0-255 Counts | This parameter displays the number of misfires that have been detected during the current 100 engine cycle test interval. 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 Injector Control Circuit High Voltage Test Status | - | OK/Not Run | 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 1-4 Injector Control Circuit Low Voltage Test Status | - | OK/Not Run | 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 1-4 Injector Control Circuit Open Test Status | - | OK/Not Run | 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. |
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 | -- | Varies | This parameter displays the desired engine coolant temperature (ECT) in degrees. |
Desired EGR Position | -- | Varies | This parameter displays the desired exhaust gas recirculation (EGR) position as a percentage of maximum pintle lift. |
Desired Idle Speed | - | 600-950 RPM | This parameter displays the desired engine idle speed as commanded by the control module. |
Desired Throttle Position | - | 1-5% | 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 with MIL On | -- | Varies | This parameter displays the mileage that has elapsed since the MIL is illuminated. |
ECT Sensor | - | -39 to +214°C (-38 to +417°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. |
ECT Sensor 1 | -- | 0-100% 3.3V Varies | This parameter displays the engine coolant temperature (ECT) sensor signal as a percentage of supply voltage. |
EGR Flow Test Counter | - | Counts | This parameter displays the number of EGR flow test samples collected during the current ignition cycle. |
EGR Learned Minimum Position | -- | 0-100% 5V Varies | This parameter displays the learned exhaust gas recirculation (EGR) valve minimum position as a percentage of the reference voltage for the EGR pintle position analogue input. |
EGR Position Sensor | -- | 0-100% 5V Varies | This parameter displays the actual EGR pintle position analogue input as a percentage of its reference voltage. |
EGR Position Sensor | -- | Varies | This parameter displays the actual EGR pintle position as a percentage of maximum pintle lift. |
EGR Solenoid Valve Command | -- | Varies | This parameter displays the commanded duty cycle for EGR solenoid by the control module. |
EGR Solenoid Valve Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the EGR solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is shorted to voltage. |
EGR Solenoid Valve Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the EGR solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is shorted to ground. |
EGR Solenoid Valve Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the EGR solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the A/C clutch relay control circuit is open. |
Engine Controls Ignition Relay Command | - | On | This parameter displays the state of the control circuit for main relay as commanded by the control module. |
Engine Controls Ignition Relay Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the main relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the main relay control circuit is shorted to voltage. |
Engine Controls Ignition Relay Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the main relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the main relay control circuit is shorted to ground. |
Engine Controls Ignition Relay Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the main relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the main relay control circuit is open. |
Engine Coolant Thermostat Heater Command | -- | Varies | This parameter displays the commanded duty cycle for the engine coolant thermostat. |
Engine Coolant Thermostat Heater Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the thermostat heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the thermostat heater control circuit is shorted to voltage. |
Engine Coolant Thermostat Heater Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the thermostat heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the thermostat heater control circuit is shorted to ground. |
Engine Coolant Thermostat Heater Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the thermostat heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the thermostat heater control circuit is open. |
Engine Load | -- | Varies | This parameter displays the calculated engine load in percent based on inputs to the control module from various engine sensors. |
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 | -- | 600-950 RPM | This parameter displays the speed of the engine crankshaft rotation from information received from the crankshaft position sensor. |
EVAP Purge Solenoid Valve Command | -- | Varies | This parameter displays the on-time or duty cycle of the evaporative emission (EVAP) canister purge solenoid commanded by the control module. Zero percent indicates no purge. One hundred percent indicates full purge. |
EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the EVAP purge solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the EVAP purge solenoid valve control circuit is shorted to voltage. |
EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the EVAP purge solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the EVAP purge solenoid valve control circuit is shorted to ground. |
EVAP Purge Solenoid Valve Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the EVAP purge solenoid valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the EVAP purge solenoid valve control circuit is open. |
Fuel Control Loop Status | - | Closed | This parameter displays the state of the fuel control system as commanded by the control module. Closed Loop operation indicates that the control module is controlling the fuel delivery based on 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 Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2s | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
Engine idling | On | ||
Fuel Pump Relay Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the fuel pump relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the fuel pump relay control circuit is shorted to voltage. |
Fuel Pump Relay Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the fuel pump relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the fuel pump relay control circuit is shorted to ground. |
Fuel Pump Relay Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the fuel pump relay control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the fuel pump relay control circuit is open. |
Fuel Tank Level Sensor | -- | Varies | This parameter displays the voltage signal received by the control module from the fuel level sensor. |
HO2S 1 or HO2S 2 | Ignition ON, Engine OFF | 400-500 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 running | Varies | ||
HO2S 1 or HO2S 2 Heater | -- | Varies | This parameter displays current feedback for the HO2S heater output as amperage. |
HO2S 1 or HO2S 2 Heater Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the HO2S heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the HO2S heater control circuit is shorted to voltage. |
HO2S 1 or HO2S 2 Heater Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the HO2S heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the HO2S heater control circuit is shorted to ground. |
HO2S 1 or HO2S 2 Heater Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the HO2S heater control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the HO2S heater control circuit is open. |
HO2S Heater Command Bank 1 Sensor 1 | ---- | Varies | This parameter displays the commanded state of the HO2S 1 heater by the control module. The scan tool will display a higher value as the heater command is increased, and a lower value if the heater is not commanded ON. |
HO2S Heater Command Bank 1 Sensor 2 | -- | Varies | This parameter displays the commanded state of the 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. |
IAT Sensor | - | -39 to +214°C (-38 to +417°F) Varies | 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 | -- | 0-100% 3.3V Varies | This parameter displays the intake air temperature (IAT) sensor signal as a percentage of supply voltage. |
Ignition 1 Signal | - | B+ | This parameter displays B+ when the control module detects a voltage at the ignition 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 Coil 1-4 Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the ignition coil control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the ignition coil control circuit is shorted to voltage. |
Ignition Coil 1-4 Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the ignition coil control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the ignition coil control circuit is shorted to ground. |
Ignition Coil 1-4 Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the ignition coil control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the ignition coil control circuit is open. |
Ignition Timing | - | 2-10° | This parameter displays the amount of spark advance the control module is commanding on the ignition control circuits. The control module determines the desired advance. |
Injector Duty Cycle | -- | Varies | This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module. |
Intake Manifold Runner Control Valve Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the intake manifold runner control valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the intake manifold runner control valve control circuit is shorted to voltage. |
Intake Manifold Runner Control Valve Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the intake manifold runner control valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the intake manifold runner control valve control circuit is shorted to ground. |
Intake Manifold Runner Control Valve Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the intake manifold runner control valve control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the intake manifold runner control valve control circuit is open. |
Intake Manifold Runner Control Valve Position | - | Closed | This parameter displays the state of the intake manifold tuning vane. It can display Open, Closed, or Intermediate based upon the feedback from the intake manifold runner control sensor. |
Knock Sensor 1 Circuit Fault | - | OK/Not Run | This parameter displays the state of the knock sensor circuit. It can display OK, Fault or Not Run. The parameter displays Fault if there is knock sensor circuit fault other than stuck high/low. |
Knock Sensor 1 Signal High | - | OK/Not Run | This parameter displays the state of the knock sensor circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the knock sensor signal is stuck high. |
Knock Sensor 1 Signal Low | - | OK/Not Run | This parameter displays the state of the knock sensor circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the knock sensor signal is stuck low. |
Knock sensor signal | -- | Varies | This parameter displays the voltage input to the control module from the knock sensor (KS). |
Long Term Fuel Trim | - | 0% | This parameter displays the commanded Long Term Fuel Trim correction by the control module. |
MAP Sensor | - | 26-52 kPa | This parameter displays the pressure from the manifold absolute pressure (MAP) sensor to the control module. |
MAP Sensor | - | 1.0-2.0V | This parameter displays the signal voltage from the MAP sensor to the control module. |
MIL Command | - | Off | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the control module. |
MIL Control Circuit High Voltage Test Status | - | OK/Not Run | This parameter displays the state of the MIL control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the MIL control circuit is shorted to voltage. |
MIL Control Circuit Low Voltage Test Status | - | OK/Not Run | This parameter displays the state of the MIL control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the MIL control circuit is shorted to ground. |
MIL Control Circuit Open Test Status | - | OK/Not Run | This parameter displays the state of the MIL control circuit. It can display OK, Fault or Not Run. The parameter displays Fault if the MIL control circuit is open. |
Reduced Engine Power | -- | Inactive | This parameter displays Active if the control module is commanding reduced engine power due to a throttle actuator control (TAC) system condition. |
Remaining Fuel in Tank | -- | 0-100% | This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module. |
Short Term Fuel Trim | - | -5% to +5% | This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor. 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. |
TAC Motor Command | -- | Varies | This parameter displays the percentage of the commanded state of the TAC motor by the control module. |
TCC/Cruise Control Brake Pedal Switch | - | Released | This parameter displays the state of the brake pedal position as determined by the redundant discrete brake switch input. The scan tool will display Applied when the brake pedal is depressed, and Released when the brake pedal is not depressed. |
Throttle Position | -- | Varies | This parameter displays the actual throttle position angle corrected by the control module using information from the two throttle position sensors. |
Throttle Position Sensor | -- | Varies | This parameter displays the absolute throttle position angle indicated by the control module using information from the throttle position sensor 1. |
Throttle Position Sensor 1 | - | 3.9-4.5V | This parameter displays the actual voltage on the TP sensor 1 signal circuit as measured by the control module. |
Throttle Position Sensor 1 Learned Minimum | - | 4.3-4.9V | This parameter displays the learned minimum value of throttle position (TP) sensor 1 as recorded by the control module during the last learn procedure. |
Throttle Position Sensor 1 Position | -- | Varies | This parameter displays the absolute throttle position angle indicated by the control module using information from the throttle position sensor 1. |
Throttle Position Sensor 2 | - | 0.5-0.9V | This parameter displays the actual voltage on the TP sensor 2 signal circuit as measured by the control module. |
Throttle Position Sensor 2 Learned Minimum | - | 0.3-0.7V | This parameter displays the learned minimum value of TP sensor 2 as recorded by the control module during the last learn procedure. |
Throttle Position Sensors 1 and 2 | - | Agree | This parameter displays Disagree when the control module detects that TP sensor 1 voltage signal is not within the correct relationship to TP sensor 2. The scan tool displays Agree under the normal operating conditions. |
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. |
Total Misfire | -- | 0 | 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 (VSS). |
Warm-Ups Since DTC Cleared | -- | Varies | This parameter indicates the number of warm up cycles that have occurred Since DTCs were cleared. The scan tool will display a higher counts as more warm up cycles have occurred since the DTCs were cleared. |
Output Control | Description | ||||||
|---|---|---|---|---|---|---|---|
A/C Clutch Relay | This function controls the A/C compressor relay. When commanded ON, the A/C compressor will cycle ON/OFF for 3-5 seconds. | ||||||
Cooling Fan Relay 1 | This function controls the low speed cooling fan relay. When commanded ON, the cooling fan will turn ON at low speed for 5 seconds. | ||||||
Cooling Fan Relay 2 | This function controls the high speed cooling fan relay. When commanded ON, the cooling fan will turn ON at high speed for 5 seconds. | ||||||
Crankshaft Position Variation Learn | This function enables the engine control module (ECM) to learn the variations in the crankshaft position (CKP) system. The ECM will learn the variations once the following conditions are met:
The ECM learns the variation values on the deceleration from fuel cut-off. | ||||||
EGR Solenoid Valve |
Note: This function is only allowed with the ignition ON, engine OFF. This function controls the exhaust gas recirculation (EGR) solenoid. When commanded ON, the EGR solenoid will cycle from 0-100 percent for 3-5 seconds. This output can also be monitored on the scan tool by observing the EGR Position Sensor data parameter. | ||||||
Engine Coolant Thermostat Heater | This function controls the engine coolant thermostat heater. The system will increase or decrease the duty cycle of the thermostat heater within a range of 0-100%. | ||||||
Engine Speed | Activates the throttle activation control (TAC) system to change engine RPM. The system will increase or decrease the RPM from the base idle speed to 1,400 RPM. The set step value changes the RPM by increments of 25 RPM, 100 RPM, and 500 RPM. The system remains in the commanded state until cancelled by the scan tool. | ||||||
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 within a range of 0-100%. | ||||||
Fuel Pump Relay |
Note: This function is only allowed with the ignition ON, engine OFF. This function controls the fuel pump relay. When commanded ON, the fuel pump relay will cycle ON/OFF for 3-5 seconds. | ||||||
Fuel Trim Reset | This function is used to reset the learned fuel trim values to their initial values. | ||||||
HO2S Heater Bank 1 Sensor 1 or 2 | This function controls the selected HO2S heater. With the engine off, HO2S heater can be commanded on for less than 3.0 seconds. With the engine running, the system will increase or decrease the duty cycle available to the engine controller. | ||||||
Ignition Timing Retard | This function controls the spark angle. The system will increase or decrease the amount of spark retard angle from the ECM calculated spark advance. For example, if the ECM calculated spark angle was 15 degrees advanced and this function requested a 3 degree retard, the commanded spark angle that would be delivered would be 12 degrees advanced. | ||||||
Inlet Manifold Runner Control Valve | This function controls the intake manifold runner control valve. Commanding the intake manifold runner control output on results in the valve being commanded closed. The intake manifold runner control is commanded closed in order to partially block the intake air travelling to each cylinder. | ||||||
Malfunction Indicator Lamp (MIL) | This function controls the malfunction indicator lamp (MIL). When commanded ON or OFF, the ECM turns the malfunction indicator lamp (MIL) ON or OFF. |
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