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Engine Control Module Scan Tool Information (LAU)

Engine Control Module Scan Tool Information (LAU)


The Engine Control Module Scan Tool Data List contains all engine-related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.

Use the Engine Scan Tool Data List only after the following is determined:


• The Diagnostic System Check - Vehicle is completed.

• No diagnostic trouble codes (DTCs)

• On-board diagnostics are functioning properly


The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that would be seen on a normally running engine.

Note

A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.


Only the parameters listed below are referenced in this service manual for use in diagnosis.


Engine Control Module Scan Tool Data

Parameter System State Expected Value Description
Base Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop
5 V Reference 1, 2, or 3 Circuit Status - OK This parameter will display OK if there is no condition with the 5 V reference circuit. Fault is displayed if a short to ground or short to B+ is present.
A/C Disengage 1-8 History A/C ON Reason for A/C Disengagement The parameter displays the last 8 air conditioning (A/C) compressor disengages in order from 1 to 8 with 8 being the most recent. There are about 10 possible causes for the A/C compressor to disengage.
A/C High Side Pressure Sensor A/C OFF 1.24 Volts This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module.
A/C ON 1.45 Volts
A/C High Side Pressure Sensor A/C OFF 500-2,200 kPa (72-319 psi) This parameter displays the pressure from the A/C high side pressure sensor signal circuit to the control module.
A/C ON 300-1,200 kPa (43-174 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.
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.
Ambient Air Temperature - °C/ °F Varies This parameter displays the outside air temperature as calculated by the control module.
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%
APP Sensor 1 Accelerator pedal not actuated 0.7-1.2 Volts 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 4.2-4.5 Volts
APP Sensor 2 Accelerator pedal not actuated 0.3-0.5 Volts 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 2.2-2.5 Volts
APP Sensor 1 and 2 - Agree/Disagree 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 Sensors - Varies This parameter displays the average of the APP sensors as calculated by the engine control (ECM) module. The APP average is a range of values indicating a low number when the accelerator pedal is not depressed to a high number when the accelerator pedal is fully depressed.
Average Total Fuel Trim - -100 to +100% This parameter displays the overall fuel trim from the Long Term idle/decel parameter and the Long Term Fuel Trim cell.
BARO - 65-104 kPa (8-16 psi) This parameter displays the barometric pressure. The control module uses the barometric pressure sensor input for fuel control to compensate for altitude differences.
BARO Sensor - 2.5-4.0 Volts This parameter displays the barometric pressure sensor voltage.
Boost Pressure Sensor - kPa This parameter displays the turbo charger boost sensor pressure.
Boost Pressure Sensor - Volts This parameter displays the turbo charger boost sensor voltage.
Brake Lamps Brake Pedal Switch Signal Brake pedal not actuated Released This parameter displays the position of the stop lamp pedal switch input to the control module.
Brake pedal fully actuated Applied
Brake Pedal Position Circuit Signal Released Applied/Released This parameter displays the serial data message of the brake signal from the electronic brake control module (EBCM).
Brake Pedal Position Signal Released Applied/Released/Invalid This parameter displays the state of the brake pedal that is transmitted over the serial data circuit from the electronic brake control module (EBCM).
Calculated Air Flow - g/s Varies This parameter displays the air flow into the engine as calculated by the control module.
Calculated Catalyst Temperature - 414°C (773°F) This parameter displays the catalytic converter temperature as calculated by the control module.
Calculated ECT - Closed Loop Fuel Control - -39 to +40°C (-38 to +104°F) This parameter displays the modeled temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined amount of time, a DTC will set.
Calculated ECT - Thermostat Diagnosis - -39 to +140°C (-38 to +284°F) This parameter displays the modeled temperature that the control module calculates from air entering the engine, coolant temperature, and ambient air temperature. If the actual engine coolant temperature does not reach this calculated temperature within a predetermined amount of time, a DTC will set.
Calculated Engine Oil Temperature - -39 to +140°C (-38 to +284°F) This parameter displays the engine oil temperature.
Camshaft Position Active Counter - Varies This parameter displays an incrementing counter when the control module receives a signal from the Intake camshaft position (CMP) sensor bank 1.
Camshaft Position Sensor - RPM This parameter displays the speed of the engine as calculated by the signal from the camshaft position (CMP) sensor.
Catalyst Monitor Complete This Ignition Cycle - Yes/No This parameter displays the monitor completion status during the current driving/monitoring cycle.
Catalyst Monitor Enabled this Ignition Cycle - Yes/No This parameter displays the monitor enable status during the current driving/monitoring cycle.
Change Engine Oil Indicator Command - On/Off This parameter sends a signal through the serial communication to inform the driver to change the engine oil. It is based on a calibrated amount of time.
Clutch Pedal Starter Inhibit Switch (If Equipped) Clutch pedal not actuated Released This parameter displays the state of the clutch pedal as determined by the control module from the clutch start switch.
Clutch pedal fully actuated Applied
Clutch Pedal Switch (If Equipped) Clutch pedal not actuated Released This parameter displays the state of the clutch pedal as determined by the control module from the clutch pedal switch.
Clutch pedal fully actuated Applied
Cold Startup - Yes/No 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.
Control Module Voltage Signal - 14.25 volts This parameter displays the state of the ignition system voltage available at the control module.
Coolant Level Switch - OK/Low This parameter displays if the level of the engine coolant is within range as determined by the control module from information received from the coolant level switch.
Cooling Fan Command - % This parameter displays the percentage commanded by the control module.
Cooling Fan Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to voltage.
Cooling Fan Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Cooling Fan Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Cooling Fan Relay 1 Command Engine coolant less than 108°C (226°F) A/C Off Off This parameter displays the control module commanded state of the fan relay control circuit.
Engine coolant greater than 108°C (226°F) A/C On On
Cooling Fan Relay 1 Control Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to a voltage.
Cooling Fan Relay 1 Control Circuit Low Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Cooling Fan Relay 1 Control Circuit Open Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Cooling Fan Relays 2 and 3 Command Engine coolant less than 108°C (226°F) A/C Off Off This parameter displays the control module commanded state of the fan relay control circuit.
Engine coolant greater than 108°C (226°F) A/C On On
Cooling Fan Relays 2 and 3 Control Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to a voltage.
Cooling Fan Relays 2 and 3 Control Circuit Low Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Cooling Fan Relays 2 and 3 Control Circuit Open Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Crank Request Signal Ignition switch not in the crank position No This parameter displays whether the ignition switch has been cycled to the crank position requesting the control module to activate the starter relay.
Ignition switch in the crank position Yes
Crankshaft Position Active Counter - Quantity This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position sensor (CKP).
Crankshaft Position Resync Counter - 0 Counts This parameter displays the number of times the control module re-syncs with the CKP sensor.
Cruise Control - Inactive This parameter displays the status of the cruise control system as determined by the control module.
Cruise Control Disengage History 1-8 Cruise ON Reason for Cruise Disengagement The parameter displays the last 8 cruise control disengages in order from 1 to 8, with 8 being the most recent. There are about 50 possible causes for the cruise control to disengage
Cruise Control Inhibit Reason - Reason for Cruise Inhibit The parameter displays the reason why the cruise control system is inhibited.
Cruise Control Inhibit Signal Command - Yes/No The parameter displays if the cruise control system is inhibited.
Cruise Control On/Off Switch - 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/Acceleration Switch - Active/Inactive The scan tool displays On, when the cruise On/Off switch is ON and the resume/accel (+) button is pressed, the ECM detects a predetermined voltage value for the resume/accel. switch.
Cruise Control Set/Coast Switch - Active/Inactive The scan tool displays On, when the cruise on/off switch is ON and the ECM detects a predetermined voltage value for the set/coast (-) switch.
Current Gear Transmission in Park/Neutral P/N This parameter displays the transmission gear commanded by the transmission control module.
Transmission not in Park/Neutral Reverse/1st-6th
Cycles of Misfire Data - 0-200 counts This parameter displays the number of misfire tests during 200 engine revolutions.
Cylinder 1-6 Current Misfire Counter - 0 The scan tool displays a range of 0-200 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 1-6 History Misfire Counter - 0 The scan tool displays a range of 0-65,535 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 has become active. The misfire history counters will update every 200 cylinder firing events.
Cylinder 1-6 Injector Command Engine idling 0.82-1.20 ms This parameter displays the amount of fuel injector ON time or pulse width as commanded by the control module.
Cylinder 1-6 Injector Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is shorted to voltage.
Cylinder 1-6 Injector Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is shorted to ground.
Cylinder 1-6 Injector Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the fuel injector control circuit. The parameter displays Fault if the fuel injector control circuit is open.
Cylinder 1-6 Injector Disabled - Misfire Detected Engine idling 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 1-6 Knock Detected - No This parameter displays the status of each cylinder for knock detection by the control module. The scan tool will display YES if a knock condition has been detected related to that cylinder combustion event. The scan tool will display NO if there is no knock condition detected related to that cylinder combustion event.
Cylinder 1-6 Knock Retard - 0 Degrees This parameter displays the knock retard as commanded by the control module for cylinders 1-6. Each cylinder is controlled individually based on both knock sensor signal inputs.
Deceleration Fuel Cut-Off - Inactive This parameter displays the status of the operating mode of the control module used to turn off the fuel injectors and the EVAP canister purge valve during certain deceleration conditions.
Desired Boost Pressure - kPa This parameter displays the desired Boost Pressure commanded by the control module.
Desired Exhaust Camshaft Position Bank 1 or 2 Engine Idling 0 Degrees This parameter displays the desired exhaust camshaft angle as commanded by the control module.
Engine speed at 2000 RPM 10 Degrees
Desired Idle Speed - Approximately 650 RPM This parameter displays the desired engine idle speed as commanded by the control module.
Desired Intake Camshaft Position Bank 1 or 2 Engine Idling 0 Degrees This parameter displays the desired intake camshaft angle as commanded by the control module.
Engine speed at 2000 RPM 10 Degrees
Desired Throttle Position - 0-100% This parameter displays the desired TP angle commanded by the control module.
Distance Since DTC Cleared - km - miles This parameter displays the mileage that has elapsed since any diagnostic trouble code (DTC) has been cleared from the control modules memory.
Distance Since First Malfunction - km - miles This parameter displays the mileage that has elapsed since the first emission failure.
Distance Since Last Malfunction - km - miles This parameter displays the mileage that has elapsed since the last emission failure.
Distance with MIL On - Km/Miles This parameter displays the distance traveled with the MIL commanded On.
ECM in Immobilizer Fail Enable Mode - No This parameter indicates whether or not the engine control module (ECM) is in failure enable mode for the immobilizer system.
ECT Sensor - 88 to 105°C (190 to 221°F) This parameter displays the temperature of the engine coolant based on input to the control module from the engine coolant temperature (ECT) sensor.
Electric Power Management Inhibit Reason - Reason This parameter displays the source of the Regulated Voltage Control (RVC) override command. RVC lowers system operating voltage to reduce system electrical load and improve fuel economy performance. The RVC command will be overridden if the voltage commanded is below the minimum system voltage required to ensure that the fuel demand, Powertrain OBD diagnostics, airflow measurement, or Transmission Control Module functions will execute properly. The RVC function can also be overridden through device controls.
Engine Controls Ignition Relay Command - On This parameter displays the state of the control circuit for control module power relay as commanded by the control module.
Engine Controls Ignition Relay Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to voltage.
Engine Controls Ignition Relay Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Engine Controls Ignition Relay Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Engine Controls Ignition Relay Feedback Signal - 12.0-14.5 Volts This parameter displays the voltage available at the EC ignition relay pin of the control module.
Engine Load Engine Idling 25-45% 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 40-60%
Engine Off Time Engine OFF 0:00:00 Seconds - Varies This parameter displays the amount of time that has elapsed since the engine was last cycled OFF.
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 Life Remaining - 0-100% This parameter displays the percent of engine oil life remaining. The controller calculates the engine oil life by monitoring engine load, coolant temperature, and engine speed.
Engine Oil Pressure Sensor - 103 kPa (15 psi) to 241 kPa (35 psi) This parameter displays the engine oil pressure.
Engine Oil Pressure Sensor - Varies This parameter displays the engine oil pressure sensor voltage.
Engine Oil Pressure Switch - OK/Low 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 Run Time Engine Operating 0:00:00 Increments when the engine is operating This parameter displays the time elapsed since the engine was started.
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 (CKP) sensor. If there is a CKP sensor DTC, the ECM calculates the engine speed from one of the camshaft position (CMP) sensors.
Engine Idling 550-700 RPM
EVAP Purge Solenoid Valve Command - 0-100% 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 Purge Solenoid Valve Control Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid 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 evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is shorted to ground.
EVAP Purge Solenoid Valve Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is open.
EVAP Purge Solenoid Valve Command - Venting/Not Venting This parameter displays the state of the control circuit for evaporative emission (EVAP) vent solenoid as commanded by the control module.
EVAP Purge Solenoid Valve Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is shorted to voltage.
EVAP Purge Solenoid Valve Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is shorted to ground.
EVAP Purge Solenoid Valve Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the evaporative emission (EVAP) purge solenoid control circuit. The parameter displays Fault if the EVAP purge solenoid control circuit is open.
Exhaust Camshaft Position Active Counter Bank 1 or Bank 2 - 0-255 gt This parameter displays an incrementing counter when the control module receives a signal from the exhaust camshaft position (CMP) sensor.
Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Test Status Bank 1 or Bank 2 - OK/Not Run This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to voltage.
Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Bank 1 or Bank 2 - OK/Not Run This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to ground.
Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Open Test Status Bank 1 or Bank 2 - OK/Not Run This parameter displays the state of the exhaust camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is open.
Exhaust Camshaft Position Bank 1 or 2 Engine Idling 0 Degrees This parameter displays the actual exhaust camshaft position in degrees.
Engine speed at 2000 RPM 10 Degrees
Exhaust Camshaft Position Command Bank 1 or 2 Engine Idling 20% This parameter displays the exhaust camshaft position in percent of range as commanded by the control module.
Engine speed at 2000 RPM 50%
Exhaust Camshaft Position Variance Bank 1 or 2 Engine Idling 0 Degrees This parameter displays in degrees, the difference between the desired exhaust camshaft position and the actual exhaust camshaft position.
Engine speed at 2000 RPM 10 Degrees
Extended Travel Brake Pedal Position Signal - Released This parameter will display the state of the brake pedal.
Fuel Control Loop Status Sensor 1 or 2 - 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 Enrichment - Hot Catalyst - No This parameter displays if the control module is commanding catalytic converter protection.
Fuel Level Sensor - 0-100% This parameter displays the amount of fuel in the fuel tank in percent of range, as calculated by the control module.
Fuel Level Sensor Left Tank (Secondary) or Fuel Level Sensor Right Tank (Primary) - 0-5 Volts This parameter displays the voltage signal received by the control module from the fuel level sensors.
Fuel Pump Enable Command Ignition ON, engine OFF Fuel pump on for 2 seconds This parameter displays the control modules commanded state of the fuel pump control circuit.
Engine idling On
Fuel Pump Enable Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is shorted to voltage.
Fuel Pump Enable Circuit Low Voltage Test Status - OK/Not Run This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is shorted to ground.
Fuel Pump Enable Circuit Open Test Status - OK/Not Run This parameter displays the state of the fuel pump relay control circuit. The parameter displays Fault if the fuel pump relay control circuit is open.
Fuel Tank Rated Capacity - 17.8 Gallons (67.3 Liters) This parameter displays the capacity of the fuel tank in liters or gallons.
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.
Generator F-Terminal Signal - 0-100% This parameter displays the amount of generator on-time as commanded by the control module. The higher the percentage the greater the generator output.
Generator L-Terminal Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to voltage.
Generator L-Terminal Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Generator L-Terminal Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Generator L-Terminal Command - 0-100% This parameter displays the control modules commanded state of the voltage regulator on the generator.
Generator L-Terminal Signal Command - On/Off This parameter displays the control modules commanded state of the voltage regulator on the generator.
HO2S 1 - 50-900 mV - Varies This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust.
HO2S 2 - 400-700 mV - Varies This parameter displays the voltage output from the HO2S to the control module. A lower voltage indicates a lean exhaust, while a higher voltage indicates a rich exhaust.
HO2S 2 Heater - Ampere(s) This Parameter displays the current feedback for the oxygen sensor heater output.
HO2S 1 or 2 Heater Command - 0-100% This parameter displays the HO2S heater ON time in percentage, as commanded by the control module.
HO2S 1 or 2 Heater Command - ON/OFF This parameter display the state of the HO2S heater control circuit as commanded by the control module.
HO2S Heater Control Circuit High Voltage Test Status Sensor 1 or 2 - OK/Fault/Not Run This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to voltage.
HO2S Heater Control Circuit Low Voltage Test Status Sensor 1 or 2 - OK/Fault/Not Run This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is shorted to ground.
HO2S Heater Control Circuit Open Test Status Sensor 1 or 2 - OK/Fault/Not Run This parameter displays the state of the oxygen sensor heater control circuit. The parameter displays Fault if the oxygen sensor heater control circuit is open.
HO2S Heater Monitor Complete This Ignition Cycle - Yes This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
HO2S Heater Monitor Enabled This Ignition Cycle - Yes This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
HO2S Module Signal Sensor 1 - 1-5 Volts This parameter displays the voltage of the HO2S control transistor, which is internal to the ECM.
HO2S Sensing Element Sensor 1 - 70-90 Ohms Depends on Temperature This parameter displays the resistance of the sensing element within the control module.
HO2S Sensing Element Sensor 2 - 20-300 Ohms Depends on Temperature This parameter displays the resistance of the sensing element within the control module.
HO2S Heater Command Bank 1 Sensor 1 - % This parameter displays the HO2S heater ON time in percentage, as commanded by the control module.
HO2S Heater Command Bank 2 Sensor 1 - % This parameter displays the HO2S heater ON time in percentage, as commanded by the control module.
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.
Ignition 1 Signal - B+ This parameter displays B+ when the control module detects a voltage at the ignition 1 input terminal.
Ignition 1 Signal - On This parameter displays On when the control module detects a voltage at the ignition 1 input terminal.
Ignition Accessory Signal - On This parameter displays On when the control module detects a voltage at the ignition 0 input terminal.
Ignition Coil 1-6 Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is shorted to voltage.
Ignition Coil 1-6 Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is shorted to ground.
Ignition Coil 1-6 Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the Ignition control circuit. The parameter displays Fault if the Ignition control circuit is open.
Ignition Off Time - Varies This parameter displays the time that the ignition has been off prior to the result of the high sided coolant rationality diagnostic being reported. This parameter will read zero and will be updated only if the High Side Coolant Rationality test is enabled. The enable criteria is based on engine soak time, engine coolant temperature and engine intake air temperature.
Ignition Timing - Degrees This Parameter displays the final spark advance in terms of a crankshaft angle.
Immobilizer Automatic Learn Timer - Inactive This parameter indicates that either the auto learn timer, used in the auto learn procedure to enable the immobilizer password learning, or the seed and key timer (used in the seed and key procedure to enable immobilizer password learning) is active.
Immobilizer Fuel Disable - Inactive This parameter indicates the immobilizer system has disabled fuel.
Immobilizer Fuel Disable Until Ignition Off - No This parameter indicates the immobilizer system has disabled fuel for the remainder of the ignition cycle.
Immobilizer Fuel Enable - No The fuel enable indicates that the immobilizer system has decided not to disable fuel for the remainder of the ignition cycle based upon the receipt of the correct immobilizer password.
Immobilizer Password Learned - Yes This indicates learning of the password received from the platform electronics is enabled. Immobilizer password learning is first enabled in assembly plant (prior to the manufacturer's enable counter being set to zero) may be re-enabled using 1 of 2 procedures.
Intake Camshaft Position Active Counter Bank 1 or 2 - 0-255 This parameter displays an incrementing counter when the control module receives a signal from the intake camshaft position (CMP) sensor.
Intake Camshaft Position Actuator Solenoid Valve Control Circuit High Voltage Test Status Bank 1 or Bank 2 - OK/Fault/Not Run This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to voltage.
Intake Camshaft Position Actuator Solenoid Valve Control Circuit Low Voltage Test Status Bank 1 or Bank 2 - OK/Fault/Not Run This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is shorted to ground.
Intake Camshaft Position Actuator Solenoid Valve Control Circuit Open Test Status Bank 1 or Bank 2 - OK/Fault/Not Run This parameter displays the state of the intake camshaft actuator solenoid control circuit. The parameter displays Fault if the camshaft actuator solenoid control circuit is open.
Intake Camshaft Position Bank 1 or 2 Engine Idling 0 Degrees This parameter displays the actual intake camshaft position in degrees.
Engine speed at 2000 RPM 10 Degrees
Intake Camshaft Position Command Bank 1 or 2 Engine Idling 20% This parameter displays the intake camshaft position in percent of range as commanded by the control module.
Engine speed at 2000 RPM 50%
Intake Camshaft Position Variance Bank 1 or 2 Engine Idling 0 Degrees This parameter displays in degrees, the difference between the desired intake camshaft position and the actual exhaust camshaft position.
Engine speed at 2000 RPM 0 Degrees
Knock Retard - 0 Degrees This parameter indicates the amount of spark advance the control module removes from the ignition control (IC) spark advance in response to the signal from the knock sensors.
KS 1 or 2 Signal - 3.86-5.02 Volts This parameters displays the voltage input to the control module from the knock sensor (KS).
Low Engine Oil Level Indicator Command - Off This parameter displays the commanded state of the low engine oil level lamp control circuit by the control module.
Low Engine Oil Pressure Indicator Command - Off This parameter displays the commanded state of the low engine oil pressure lamp control circuit by the control module.
Long Term Fuel Trim - 0% This parameter displays the commanded Long Term Fuel Trim correction by the control module for cruise and acceleration conditions.
Long Term Fuel Trim Idle/Deceleration - 0% This parameter displays the commanded Long Term Fuel Trim correction by the control module for idle and deceleration conditions.
MAF Performance Test - OK This parameter displays the status of the mass air flow (MAF) performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.
MAF Sensor Engine Idling 3.4-6.3 g/s Varies with altitude This parameter displays the measured quantity of air flowing into the engine.
Engine speed at 2,500 RPM 11.88 g/s Varies with altitude
MAF Sensor Engine Idling 2,000-2,500 Hz Varies with altitude The scan tool displays a range of 0-65,535 hertz. This parameter displays the frequency signal input to the control module, and represents measured quantity of air flowing into the engine.
Malfunction Counter - Quantity This Parameter displays the number of ignition cycles with a failure reported since the first ignition cycle with a failure reported. This Parameter is only meaningful within the context of a failure record or freeze frame.
Map Sensor - kPa This Parameter displays the unfiltered engine intake manifold absolute pressure (MAP).
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/Fault/Not Run This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is shorted to voltage.
MIL Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is shorted to ground.
MIL Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the MIL control circuit. The parameter displays Fault if the MIL control circuit is open.
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.
Moderate Brake Apply Signal Brake pedal not actuated Released This parameter displays the state of the brake pedal that is transmitted over the serial data circuit from the electronic brake control module (EBCM).
Brake pedal fully actuated Applied
Not Run Counter - 0 This parameter indicates the number of ignition cycles without a pass or a failure reported since the first ignition cycle with a failure reported.
Number of DTC(s) - 0 This parameter indicates the number of diagnostic trouble codes (DTCs)
O2S/HO2S Monitor Complete This Ignition Cycle - Yes This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
O2S/HO2S Monitor Enabled This Ignition Cycle - Yes This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
Park/Neutral Switch (If Equipped) Transmission in Park/Neutral Park/Neutral This parameter displays whether the transmission range selector is in park or neutral.
Transmission not in Park/Neutral In-Gear
Pass Counter - 0 This parameter indicates the number of ignition cycles with a pass reported and no failures reported since the first ignition cycle with a failure reported.
Power Enrichment - Inactive This parameter displays the status of the operating mode of the control module used to increase fuel delivery during certain acceleration conditions.
Power Mode - Off, Accessory, Run, Crank Request This parameter displays the position of the ignition switch.
PRNDL - Varies This parameter displays the transmission range determined directly from the decoding of the PRNDL A, B, C, and P inputs that are based upon an internal mode switch.
Reduced Engine Power - Inactive This parameter displays whether the control module is commanding reduced engine power due to a throttle actuator control (TAC) system condition.
Remaining Fuel in Tank - %-Varies This parameter displays the amount of fuel in a percent age that remains in the fuel tank as determined by the control module from information received from the fuel level sensors.
Remaining Fuel in Tank - Liter/Gallon/percent - Varies This parameter displays the amount of fuel in liters/gallons/percent that remains in the fuel tank as determined by the control module from information received from the fuel level sensors.
Remote Vehicle Start Disable History 1-8 - Reason for Remote Vehicle Start Disable These parameters displays the last eight reasons the control module disabled remote vehicle start (RVS).
Remote Vehicle Start Request Signal - On/Off This parameter displays the state of the request received over serial communication from the remote vehicle start (RVS) system to start the vehicle in remote mode.
Replicated Transmission OSS Signal - 0 This parameter displays the replicated transmission output speed received from the transmission control module. Replicated output speed results from hardware in the TCM that re-transmits the transmission output speed sensor pulses to the ECM.
Reverse Position Switch - OFF This parameter displays whether the transmission range selector is reverse.
Secondary Air Injection Monitor Complete This Ignition Cycle - Yes This parameter displays the diagnostic monitor completion status during the current driving/monitoring cycle.
Secondary Air Injection Monitor Enabled This Ignition Cycle - Yes This parameter displays the diagnostic monitor enable status during the current driving/monitoring cycle.
Secondary Air Injection Pressure Sensor - kPa This parameter displays the secondary air injection system pressure.
Secondary Air Injection Pressure Sensor - Volts This parameter displays the secondary air injection system pressure input as a percentage of its reference voltage.
Secondary Air Injection Pressure Sensor Variance - kPa This Parameter displays the difference between the predicted and actual secondary air injection system pressure.
Secondary Air Injection Pump Relay Command - OFF This parameter displays the state of the control circuit as commanded by the control module.
Secondary Air Injection Pump Relay Control Circuit High Voltage Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Pump Relay Control Circuit. It display's fault when the control circuit is shorted to voltage.
Secondary Air Injection Pump Relay Control Circuit Low Voltage Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Pump Relay Control Circuit. It display's fault when the control circuit is shorted to ground.
Secondary Air Injection Pump Relay Control Circuit Open Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Pump Relay Control Circuit. It display's fault when the control circuit is opened.
Secondary Air Injection Pump Relay Control Circuit Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Pump Relay Control Circuit driver inside the control module.
Secondary Air Injection Solenoid Valve Command - On/Off This Parameter displays the commanded state of the secondary air injection valve output .
Secondary Air Injection Solenoid Valve Control Circuit High Voltage Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Solenoid Valve Control Circuit. It display's fault when the control circuit is shorted to voltage.
Secondary Air Injection Solenoid Valve Control Circuit Low Voltage Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Solenoid Valve Control Circuit. It display's fault when the control circuit is shorted to ground.
Secondary Air Injection Solenoid Valve Control Circuit Open Test Status - OK/Fault/Not Run This Parameter displays the status of the Secondary Air Injection Solenoid Valve Control Circuit. It display's fault when the control circuit is opened.
Secondary Air Injection Solenoid Valve Control Circuit Status - OK This Parameter displays the commanded state of the Secondary Air Injection Solenoid valve output .
Short Term Fuel Trim - -3% to +3% This parameter displays the short-term correction to the fuel delivery by the control module in response to oxygen sensor 1 or 2. If the oxygen sensor indicates a lean air/fuel mixture, the control module will add fuel increasing the short term fuel trim above 0. If the oxygen sensor indicates a rich air/fuel mixture, the control module will reduce fuel decreasing the short term fuel trim below 0.
Spark - 2-10 Degrees 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.
Starter Relay Command Ignition switch not in the crank position Off This parameter indicates whether the control module is commanding the starter relay ON or OFF.
Ignition switch in the crank position On
Starter Relay Control Circuit High Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is shorted to voltage. This parameter may not change if the scan tool is used to command the relay control circuit ON.
Starter Relay Control Circuit Low Voltage Test Status - OK/Fault/Not Run This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is shorted to ground. This parameter may not change if the scan tool is used to command the relay control circuit ON.
Starter Relay Control Circuit Open Test Status - OK/Fault/Not Run This parameter displays the state of the starter relay control circuit. The parameter displays Fault if the starter relay control circuit is open. This parameter may not change if the scan tool is used to command the relay control circuit ON.
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.
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.
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 System Learned Counter - 0 This parameter displays the steps counted in learning the throttle actuator control parameters. The last step learned is 11.
TCC/Cruise Control Brake Pedal Switch - Released This parameter displays that the state of the redundant discrete brake switch input to the controller indicates that the brake is applied.
TCC Status - Unlocked This parameter displays the commanded status of the torque convertor clutch.
TCM Torque Increase - No This parameter displays whether or not the controller has responded to a request for a torque increase.
TCM Torque Reduction - No This parameter displays whether EBTCM has determined a reduction in torque took place.
Throttle Position - 0-100% This parameter displays the percent of throttle opening as calculated by the control module using information from the TP sensors.
Throttle Position Performance Test - OK This parameter displays the status of the TP performance test by the control module. The scan tool will display OK if no fault is found. The scan tool will display Fault if the control module detects a fault during the test.
Throttle Position Sensor 1 - 0.5-0.8 Volts 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 - 0-0.6 Volts This parameter displays the learned minimum value of throttle position (TP) sensor 1 as recorded by the control module during the last learn procedure.
Throttle Position Sensor 2 - 4.7-4.1 Volts 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 - 5.0-3.7 Volts 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.
Torque Delivered Signal - 0-100% This is the calculated torque output from the engine to the transmission used by the EBTCM for the traction control system operation.
Torque Request Signal - 0-100% The EBTCM sends a Desired Torque Level signal request to the control module. This decreases torque from the powertrain in order to reduce wheel slip during acceleration for the traction control.
Total Misfire Count - 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.
Total Knock Retard - Degree This parameter indicates how much ignition spark timing is being retarded due to all control systems monitored by the control module. The scan tool will display a high value during extreme conditions such as high temperatures and antilock braking. The scan tool will display a lower value during lighter driving conditions.
Total Misfire - 0 This parameter displays the number of possible misfires during the last 200 cylinder firing events detected on all cylinders as calculated by the control module. The misfires are calculated based on engine crankshaft rotation speed variations. The scan tool displays an incrementing counter.
Traction Control Status - Disabled This parameter displays Active if the electronic brake and traction control module (EBTCM) is commanding traction control.
Traction Control Status - Inactive This parameter displays Active if the electronic brake and traction control module (EBTCM) is commanding traction control.
Traction Control Torque Delivered Signal - Varies This parameter indicates the torque delivered from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.
Traction Control Torque Increase - No This parameter displays whether or not the controller has responded to a request for a torque increase.
Traction Control Torque Reduction - No This parameter displays whether the transmission control module (TCM) is reducing torque.
Traction Control Torque Request Signal - Varies This parameter indicates the torque requested from the engine to the transmission as calculated by the control module. The scan tool will display a higher value for higher torque, and a lower value for lower torque.
Turbocharger Bypass Solenoid Valve Command - Boost/Bypass This parameter displays the state of the control circuit.
Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to voltage.
Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Turbocharger Wastegate Solenoid Valve Command - 0 % This parameter displays the on-time or duty cycle of the Solenoid Valve commanded by the control module. Zero percent indicates no boost. One hundred percent indicates full boost. This parameter displays the state of the control circuit as commanded by the control module.
Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to voltage.
Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is shorted to ground.
Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status - OK/Not Run This parameter displays the state of the control circuit. The parameter displays Fault if the control circuit is open.
Vehicle Speed Sensor - Km/h 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).
Volumetric Efficiency Engine Idling 5-25% This parameter displays the calculated volumetric efficiency of the engine as calculated by the control module.
Engine speed at 2,500 RPM 5-25%
Warm Ups Since DTC Cleared - Quantity 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.
Wide Open Throttle - No This parameter displays the throttle status commanded by the control module. The scan tool will display YES if the vehicle throttle is commanded to 100 percent.



Engine Control Module (ECM) Scan Tool Output Controls

Output Control Description
A/C Compressor Clutch Relay The engine must be running and the ECM must receive an A/C request from the HVAC control module in order to enable the output control. The ECM de-energizes the A/C compressor clutch relay when you select OFF. The relay remains de-energized until you select ON.
Compression Test This device control is used to set-up the engine for a compression test. The fuel pump, fuel injectors, and spark are all disabled. The throttle is opened to a wide open throttle (WOT) position. The extended crank feature is not active. The scan tool initiates the test when the following conditions are met:
• Transmission in Park or Neutral

• No transmission range switch DTCs set

• There are no throttle actuator control system DTCs set

• The engine speed is 0 RPM.

• There are no CKP sensor DTCs set

• The vehicle speed is 0 km/h (0 mph)

• There are no VSS sensor DTCs set


Cooling Fan Relay 1 This function activates the cooling fan relay 1. The normal commanded state of the fan relay is NONE. The ECM allows cooling fan relay control when the following conditions are met:
• The ignition is ON or the engine is running

• A/C compressor operation is not requested.

• The engine coolant temperature is less than 106°C (224°F)


Cooling Fan Relay 2 & 3 This function activates the cooling fan relay 2 and relay 3. The normal commanded state of the fan relays is NONE. The ECM allows cooling fan relay control when the following conditions are met:
• The ignition is ON or the engine is running

• A/C compressor operation is not requested.

• The engine coolant temperature is less than 106°C (224°F).


Cylinder Power Balance
Note

The Misfire Current and Misfire History parameters may not increment when using this function.


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:
• The engine is operating and the engine idle is stable.

• The vehicle speed is 0 km/h (0 mph).

• There are no DTCs set for the vehicle speed sensor.


If the fuel injector was disabled for 30 seconds, fuel injector control is not allowed again on the same fuel injector for 60 seconds.
Engine Oil Life Reset This output control is used to reset the engine oil life monitor from 0 to 100 %.
Engine Speed This function controls the idle speed override in 25 RPM, 100 RPM, and 500 RPM increments, from the base idle speed to 1,400 RPM. The scan tool initiates the test when the following conditions are met:
• The transmission is in park or neutral.

• The engine speed is less than 1,000 RPM.


The engine speed will remain in the commanded state until cancelled by the scan tool.
EVAP Purge Solenoid Valve
Note

The EVAP Purge Solenoid Command parameter may not change states when using this output control.


This function controls the evaporative emission (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 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the scan tool.
EVAP Purge/Seal
Note

The EVAP Purge and Vent Solenoid Command parameters may not change states when using this output control.


This function activates both the EVAP purge solenoid valve and EVAP vent solenoid to seal the EVAP system. When activated, the purge valve is commanded to 0 percent and the vent valve is commanded ON, Not-venting. The normal commanded state for both solenoids is None. Both of the solenoids remain in the commanded state until cancelled by the scan tool or the FTP sensor exceeds -24 mm Hg (-12 inch H20).
EVAP Test Activates the on-board EVAP diagnostic test.
EVAP Vent Solenoid Valve
Note

The EVAP Vent Solenoid Command parameter may not change states when using this output control.



• Cancelled by the scan tool

• The EVAP canister purge solenoid is more than 0 percent, and the FTP sensor exceeds -24 mm Hg (-12 inch H20).


Exhaust Camshaft Position Actuator Bank 1 or 2 This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 40 crankshaft degrees. The scan tool initiates the test when the following conditions are met:
• The vehicle speed is 0 km/h (0 mph).

• The transmission is in park or neutral.

• The engine speed is between 1,000-1,400 RPM.


The system remains in the commanded state until cancelled by the scan tool.
Exhaust Camshaft Position Actuator Solenoid Valve Bank 1 or 2 This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:
• The ignition is ON with the engine OFF.

• No engine speed is detected.


The system remains in the commanded state until cancelled by the scan tool.
Fuel Control Loop Status This function controls the heated oxygen sensor (HO2S) loop status. The commanded states include NONE, OPEN, and CLOSED. The normal commanded state is NONE. The loop status changes as commanded, OPEN or CLOSED. The system remains in the commanded state until cancelled by the scan tool.
Fuel Injector Balance (If equipped) This function enables the fuel injector in order to verify the correct fuel injector flow. The ECM will pulse the selected fuel injector when the following conditions are met:
• All instruction on the scan tool is complete.

• A fuel injector is selected.

• The ignition is ON with the engine OFF.


The selected fuel injector can only be flowed/pulsed once per ignition cycle.
Fuel Pump Enable This function controls the fuel pump. The normal commanded state is NONE. The scan tool initiates the test when the following conditions are met:
• There are no vehicle speed sensor DTCs set.

• The vehicle speed is 0 km/h (0 mph).


When commanded ON/OFF, the engine control module (ECM) turns the fuel pump ON/OFF. If the engine is running and the fuel pump is commanded OFF, the engine will stall. The system remains in the commanded state for about 2 seconds or until cancelled by the scan tool or the ECM detects a vehicle speed.
Fuel Trim Enable This function enables or disables the ECM fuel trim learning. The normal commanded state is None.
Fuel Trim Reset This function resets the fuel trim data and the learned values for the rear heated oxygen sensors.
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:
• The engine is operating to turn OFF the component

• The vehicle speed is 0 km/h (0 mph)

• Transmission in Park or Neutral

• In the correct power mode

• The output control timer has not expired


HO2S Heater Sensor 1 or Sensor 2 Commands HO2S heater ON, 0-100 percent in 10 percent increments while the engine is running.
Idle Learn This function allows the throttle position and the idle speed to be relearned by the ECM, once the following conditions have been met.
• The ignition is ON with the engine OFF.

• The ECT is between 5-85°C (41-185°F).

• No throttle actuator control (TAC) system DTCs are set.


Idle Spark Disables and enables idle spark advance with the engine running.
Intake Camshaft Position Actuator Bank 1 or 2 This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 40 crankshaft degrees. The scan tool initiates the test when the following conditions are met:
• The vehicle speed is 0 km/h (0 mph).

• The transmission is in park or neutral.

• The engine speed is between 1,000-1,400 RPM.


The system remains in the commanded state until cancelled by the scan tool.
Intake Camshaft Position Actuator Solenoid Valve Bank 1 or 2 This function controls the selected camshaft actuator solenoid. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the camshaft actuator solenoid ON/OFF. The scan tool initiates the test when the following conditions are met:
• The ignition is ON with the engine OFF.

• No engine speed is detected.


The system remains in the commanded state until cancelled by the scan tool.
Malfunction Indicator Lamp (MIL) This function controls the malfunction indicator lamp (MIL). The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the MIL ON/OFF. The system remains in the commanded state until cancelled by the scan tool.
Misfire Graphics Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph.
Remote Vehicle Start Disable History Reset This output control is used to trigger the reset of the last 8 reasons the ECM has disabled remote vehicle start (RVS).
Secondary Air Injection Pump Relay This function controls the secondary air injection pump relay. The normal commanded state is NONE. When commanded ON/OFF, the ECM turns the pump relay ON/OFF. The system remains in the commanded state until canceled by the scan tool. The scan tool initiates the test when the following conditions are met:
• The engine coolant temperature is greater than a predetermined temperature.

• The AIR pump has not been enabled for greater than 30 seconds.


Secondary Air Injection Solenoid Valve This function is used to turn the AIR Valve on or off.
Secondary Air Injection System This function is used to turn the AIR Pump on or off.
Secondary Air Injection Test This function is used to trigger the secondary air injection (SAI) diagnostic service bay test, which causes the on board SAI diagnostic to execute until it is completed or aborted. The SAI diagnostic consists of three phases, SAI on test, SAI valve shut test, and SAI pump off test, all of which are triggered by this device control.
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:
• The engine speed is 0 RPM

• There are no CKP sensor DTCs set

• The vehicle speed is 0 km/h (0 mph)

• There are no VSS sensor DTCs set

• There are no theft deterrent DTCs set

• Transmission is in Park or Neutral

• No transmission range switch DTCs set

• There are no TAC system DTCs set

• The ignition voltage is within range

• In the correct power mode

• Not enough time has elapsed since the last time the starter has been enabled with a scan tool


Throttle Position This function controls the throttle valve in 10 percent increments. The scan tool initiates the test when the following conditions are met:
• There are no vehicle speed sensor DTCs set.

• The vehicle speed is 0 km/h (0 mph).

• The ignition is ON, with the engine OFF.

• The ECM is not commanding a throttle learn.


The system remains in the commanded state until cancelled by the scan tool.
Turbocharger Bypass Solenoid Valve This function controls the turbocharger bypass valve. The normal commanded state is NONE. The scan tool initiates the test when the following conditions are met:
• The ignition switch is in the Run/crank position.

• The control is not allowed during boost

• The output control timer has not expired.


Turbocharger Wastegate Solenoid Valve This function controls the duty cycle of the turbocharger wastegate valve. The normal commanded state is NONE. The system will increase or decrease the on time by changing the duty cycle of the solenoid in 10 percent increments within a range of 0-100 percent. The scan tool initiates the test when the following conditions are met:
• The ignition switch is in the Run/crank position.

• An over boost condition is not detected.

• The output control timer has not expired.


Throttle Sweep This function moves the Throttle plate slowly from a closed position to wide open position, aiding diagnosis of TAC motor.