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| Table 1: | Engine Control Module Scan Tool Data Parameters |
| Table 2: | 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 |
|---|---|---|---|
Operating Conditions: Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off/Brake Pedal Released | |||
5 Volt Reference 1, 2, or 3 | 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 Volt Reference 1, 2, or 3 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 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 | 1117-2350 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 wide open throttle (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 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 accelerator pedal position (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 to 1. |
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 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 | ||
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. |
Control Module Voltage Signal | -- | B+ | This parameter displays the state of the ignition system voltage available at the control module. |
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 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. |
Cooling Fan Relay 3 Command | -- | Varies | This parameter displays the commanded state of the cooling fan relay 3 control circuit. The cooling fan relay 3 should be ON when the scan tool indicates the fan control Relay 3 command is ON. The cooling fan relay 3 should be OFF when the scan tool indicates the fan control Relay 3 command is OFF. |
CPP Learned Apply Position | -- | V | This parameter displays the position learned for the clutch pedal position (CPP) sensor when the clutch pedal is fully applied during the associated learn procedure. |
CPP Learned Release Position | -- | V | This parameter displays the position learned for the clutch pedal position sensor when the clutch pedal is released. |
CPP Sensor | -- | Varies | This parameter displays the displacement of the clutch pedal (corrected and normalised based upon its learned released and fully applied positions), where 0% corresponds to the clutch pedal being released and 100% corresponds to the clutch pedal being fully applied. |
CPP Sensor | -- | Varies | This parameter displays the clutch pedal position sensor analogue input as a percentage of its reference voltage. |
Current Gear | Transmission in Park or Neutral | 1-6 | Displays Unknown, 1, 2, 3, 4, 5, or 6. This parameter indicates the current commanded gear position. |
Desired ECT | -- | Varies | This parameter displays the desired engine coolant temperature (ECT) in degrees. |
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 Last Malfunction | -- | Varies | This parameter displays the distance accumulated when the emission diagnostic trouble code last failed. |
Distance This Driving Cycle | -- | 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. |
ECT Sensor 1 | -- | -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 1. |
ECT Sensor 2 | -- | -39 to +140°C (-38 to +284°F) Varies | This parameter displays the temperature of the radiator coolant based on input to the control module from the radiator coolant temperature (ECT) sensor 2. |
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 Coolant Temperature | -- | -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 1. |
Engine Coolant Thermostat Heater Command | -- | 0-100% | This parameter displays the commanded duty cycle for the engine coolant thermostat. |
Engine Load | Engine Idling | 11-20% 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 Oil Level Switch | -- | OK | This parameter displays if the level of the engine oil is within range as determined by the control module from information received from the engine oil level switch. |
Engine Oil 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 | ||
EVAP Purge Solenoid Valve Command | -- | 10-20% | 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. |
Exhaust Camshaft Position Command | -- | 45-75% | This parameter displays the commanded duty cycle for the exhaust camshaft as commanded by the control module. |
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 Pump Relay Command | Ignition ON, engine OFF | Fuel pump on for 2 s | This parameter displays the control modules commanded state of the fuel pump relay control circuit. |
Engine idling | On | ||
Fuel Tank Pressure Sensor | - | 0.00 inch H2O | 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. |
Generator F-Terminal Signal | -- | 40-70% | This parameter indicates the generator field duty cycle as commanded by the voltage regulator or control module. The scan tool will display a higher value for a higher commanded generator output, and a lower value for a lower commanded generator output. |
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 Heater Sensor 1 or 2 | -- | 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 | -- | 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. |
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 | - | 0-5 V | This parameter displays the voltage calculated by the control module from the intake air temperature sensor. |
Ignition Accessory Signal | -- | ON | This parameter displays the state of the ignition accessory position input to the control module from the ignition switch. |
Ignition Switch Status | -- | Active | This parameter displays active when the ignition switch is supplying battery voltage to the control module ignition circuit. |
Intake Camshaft Position Command | -- | 45-75% | This parameter displays the commanded duty cycle for the intake camshaft as commanded by the control module. |
Intake Manifold Tuning Control Valve Control Circuit Command | -- | Off | This parameter displays the state of the intake manifold tuning valve solenoid control circuit as commanded by the control module. |
Long Term Fuel Trim | -- | -5 to +5% | 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 | -- | 0.98-1.42 V | This parameter displays the signal voltage from the MAP sensor to the control module. |
Park/Neutral Position Switch | -- | Park/Neutral | This parameter displays the position of the transmission selection as Park/Neutral or in gear. |
Reduced Engine Power | -- | Inactive | This parameter displays the status of the operating mode of the control module used to reduce engine power to prevent catalytic converter or engine damage or due to an affected throttle actuator control (TAC) system. |
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. |
Reverse Position Switch | -- | OFF | Manual Transmission Reverse Switch ON indicates that the reverse switch hard wire input to the ECM is active. |
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. |
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 | -- | Enabled | This parameter indicates the status of the TAC motor driver by the ECM. The scan tool will display Enabled if TAC motor operation is allowed. The scan tool will display disabled if the TAC motor is disabled. |
TAC Motor Command | -- | 0-100% Varies | This parameter displays the percentage of the commanded state of the TAC motor by the control module. |
Throttle Position | -- | 2-6% | This parameter displays the actual throttle position angle indicated by the control module using information from the two throttle position sensors. |
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 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 | ||
Torque Delivered Signal | -- | Varies | This parameter displays a calculated valve based on engine load, throttle position, and other engine inputs. This parameter is calculated to within 20 N·m (15 lb ft) of actual measured engine torque. |
Total Knock Retard | -- | 0 Degrees | This parameter indicates how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions. |
Total Misfire | -- | 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 (VSS). |
Warm-ups Since DTC Cleared | -- | Varies | This parameter displays the number of warm-ups since the DTC was cleared. |
Output Control | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
A/C 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:
| ||||||||||
Clutch Pedal Position Learn | This device control is used to trigger the procedure to learn the clutch pedal fully applied position. | ||||||||||
Cooling Fan | 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:
| ||||||||||
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. | ||||||||||
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:
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EVAP Test | Activates the on-board EVAP diagnostic test. | ||||||||||
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 initiates the test when the following conditions are met:
| ||||||||||
Exhaust Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5 degree increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 seconds, the actuator control is not allowed again on the same actuator for 60 seconds. | ||||||||||
Fuel Pump Relay | This function controls the fuel pump relay. The normal commanded state is None. When commanded ON or OFF, the ECM turns the fuel pump ON or OFF. The scan tool initiates the test when the following conditions are met:
| ||||||||||
Fuel Trim Reset | This function is used to reset the learned fuel trim values to their initial values. | ||||||||||
Generator L-Terminal | This function is used to override the state of the generator L terminal output. The commanded states are ON and OFF. Selecting OFF commands the ECM to turn OFF the generator and stop generating an output voltage. The scan tool initiates the test when the following conditions are met:
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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:
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Inlet Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft in 5 degree increments. The scan tool initiates the test when the following conditions are met:
If the actuator is disabled after 30 seconds, the actuator control is not allowed again on the same actuator for 60 seconds. | ||||||||||
Inlet Manifold Runner Control Valve | This device control is used to override the state of the intake manifold tuning valve output. A output test is used to select whether commanding the intake manifold tuning valve output on or off results in the valve being commanded closed or open. | ||||||||||
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. | ||||||||||
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. |
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