Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information
- The identification of the control modules which command the system
- The ability of the control modules to communicate through the serial data circuit
- The identification of any stored diagnostic trouble codes (DTCs) and the codes' statuses
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
Scan Tool Data List
The Engine Scan Tool Data List contains all engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. A 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 conditions are determined
- The Diagnostic System Check - Vehicle is completed.
- There are no diagnostic trouble codes (DTCs).
- The On-Board diagnostics are functioning properly.
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 the values that would be seen on a normal running engine.
| IMPORTANT | Do not use a scan tool that displays faulty data. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and in unnecessary parts replacement. |
The column labeled Data List indicates where a parameter is located on the scan tool. Review the scan tool operating manual for the exact locations of the data lists. The following is a description of each term listed
| Scan Tool Parameter | Data List | Parameter Range/Units | Typical Data Values |
|---|---|---|---|
| Operating Conditions: Engine Idling/Radiator Hose Hot/Park or Neutral/Closed Loop/Accessories Off | |||
| 5-Volt Reference 1 or 2 | EVAP, IGN, IND, TAC | Volts | 4.5 |
| 5-Volt Reference 1 or 2 Circuit Status | EVAP, IGN, IND, TAC | OK/Fault | OK |
| A/C Relay Command | ENG, IND, MF, TAC | On/Off | Off |
| Air Flow Calculated | ENG, EVAP, FT, HO2S, IND, MF, TAC | G/s | |
| Ambient Air Temperature | ENG, EVAP | °C/°F | Varies |
| APP Indicated Angle | ALL | 0-100% | 0.0 |
| APP Sensors | TAC | Volts | 0.0 |
| APP Sensor 1 | TAC | 0.9-4.5 Volts | 0.92 Volt |
| APP Sensor 1 Indicated Position | TAC | % | 0.0 |
| APP Sensor 2 | TAC | 0.42-2.25 Volts | 0.43 Volt |
| APP Sensor 2 Indicated Position | TAC | % | 0.0 |
| APP Sensor 1 and 2 | TAC | Agree/Disagree | Agree |
| BARO | ENG, EVAP, FT, HO2S, IGN, IND | 65-104 kPa -16 psi | Varies with altitude |
| BARO Sensor | IND | Volts | Varies |
| BPP Circuit Signal | TAC | Applied/Released | Released |
| BPP Signal | TAC | Applied/Released/Invalid | Released |
| CAC Int Pump Relay Circuit Status | IND | OK/Incomplete/Open/Short B+/Short Gnd | OK |
| CAC Int Pump Relay Command | IND | On/Off | Varies |
| Calc. TWC Temp. Bank 1 or Bank 2 | FT, MF | °C/°F | Varies |
| Catalytic Converter Protection Active | FT, HO2S | Yes/No | No |
| CKP Active Counter | IGN | Counts | Incrementing |
| CKP Resync Counter | IGN | Counts | Varies |
| CKP Sensor | IGN | RPM | Engine idle speed |
| Cmmd. A/F Equivalence Ratio | ENG, FT, HO2S, IND | Ratio | 14.7:1 |
| CMP Active Counter | CMP, IGN | Counts | Incrementing |
| CMP Sensor | CMP, IGN, MF | RPM | Engine idle speed |
| Cold Startup | ENG, EVAP | YES/NO | Varies |
| Cruise Control Active | ENG, TAC | Active/Inactive | Inactive |
| Cycles of Misfire Data | MF | 0-99 | Incrementing |
| Cylinder 1-8 IC Circuit Status | MF | Incomplete/Short B+/Short Gnd/ Open | OK |
| Cylinder 1-8 Injector Circuit Status | MF | Incomplete/Short B+/Short Gnd/Open | OK |
| Decel. Fuel Cutoff | ENG, FT, HO2S | Active/Inactive | Inactive |
| Desired Exh. CMP Bank 1 or Bank 2 | CMP | Degrees | Varies |
| Desired Idle Speed | ENG, CMP, EVAP, IND, TAC | 0-7,000 RPM | 650 RPM |
| Desired Int. CMP Bank 1 or Bank 2 | CMP | Degrees | Varies |
| Distance Since DTC Cleared | ENG | Miles/Kilometers | Varies |
| EC Ignition Relay Circuit Status | TAC | OK/Incomplete/Short B+/Short Gnd/Open | OK |
| EC Ignition Relay Command | ENG, TAC | On/Off | On |
| EC Ignition Relay Feedback Signal | ENG, TAC | Volts | 13.5 V |
| ECT Sensor | ALL | 39 to +140°C/-38 to +284°F | 85-105°C/185-220°F |
| Engine Load | ALL | 0-99% | 2% |
| Engine Off Time | EVAP | 0:00:00 | Varies |
| Engine Oil Level Switch | ENG, CMP | OK/Low | OK |
| Engine Oil Life Remaining | ENG, CMP | % | Varies |
| Engine Oil Pressure Sensor | ENG, CMP, MF | KPa/psi | Varies |
| Engine Oil Temperature Calculated | CMP | °C/°F | Varies |
| Engine Oil Temperature Sensor (if equipped) | CMP | °C/°F | Varies |
| Engine Run Time | ALL | 0:00:00 | Varies |
| Engine Speed | ALL | RPM | 650 RPM |
| EVAP Fault History | EVAP | Vacuum/Purge Valve Leak/Small Leak/Weak Vacuum/No Test Result | Vacuum |
| EVAP Purge Solenoid Command | ENG, EVAP, FT, HO2S | 0-100% | Varies |
| EVAP Purge Solenoid Circuit Status | EVAP | Incomplete/Fault/OK | Incomplete |
| EVAP Vent Solenoid Command | ENG, EVAP | Venting/Not Venting | Not Venting |
| EVAP Vent Solenoid Circuit Status | EVAP | Incomplete/Fault/OK | Incomplete |
| Exh. CMP Angle Bank 1 or Band 2 | CMP | Degrees | Varies |
| Exh. CMP Bank 1 or Bank 2 Active Counter | CMP, IGN | Counts | Varies |
| Exh. CMP Bank 1 or Bank 2 Command | CMP | % | Varies |
| Exh. CMP Bank 1 or Bank 2 Variance | CMP | Degrees | Varies |
| Ext. CMP Solenoid Bn 1 or Bn 2 Circuit Status | CMP | OK/Incomplete/Short B+/Short Gnd/Open | OK |
| Ext. Travel BPP Signal | TAC | Applied/Released/Invalid | Released |
| Fuel Level Sensor - Left Tank | EVAP | 0-5 Volts | Varies |
| Fuel Level Sensor - Right Tank | EVAP | 0-5 Volts | Varies |
| Fuel Pump Relay Circuit Status | ENG | Incomplete/Fault/OK | OK |
| Fuel Pump Relay Command | ENG | On/Off | On |
| Fuel Tank Level Remaining | ENG, EVAP, FT, MF | % | Varies |
| Fuel Tank Pressure Sensor | EVAP | Volts | Varies |
| Fuel Tank Pressure Sensor | ENG, EVAP | In H2O/mm Hg | Varies |
| Fuel Tank Rated Capacity | EVAP | Liters/Gal | Varies |
| Fuel Trim Cell | ENG, FT | Varies | 2 |
| Fuel Trim Learn | FT | Enabled/Disabled | Enabled |
| Fuel Trim System Test State | FT | Disabled, Enabled, Run Purge Test, Monitoring | Varies |
| Fuel Volatility | EVAP, FT | Low/Moderate/High | Varies |
| HO2S Bank 1 or Bank 2 Sensor 1 | ENG, EVAP, FT, HO2S, IND | MV | 80-850 |
| HO2S Bank 1 or Bank 2 Sensor 2 | ENG, FT, HO2S | MV | Varies 400-800 mV |
| HO2S Bank 1 or Bank 2 Sensor 1 Heater | HO2S | Amps | Varies |
| HO2S Bank 1 or Bank 2 Sensor 2 Heater | HO2S | Amps | Varies |
| HO2S Bank 1 Sensor 1 Heater Command | HO2S | % | Varies |
| HO2S Bank 1 Sensor 1 Heater Command | HO2S | ON/OFF | ON |
| HO2S Bank 1 or Bank 2 Sensor 2 Heater Command | HO2S | % | Varies |
| HO2S Bank 1 or Bank 2 Sensor 2 Heater Command | HO2S | ON/OFF | ON |
| Hot Open Loop | HO2S, FT | Active/Inactive | Inactive |
| IAT Sensor | ALL | 39 to +140°C/-38 to +284°F | Varies |
| IAT Sensor 2 | ENG, EVAP, IND | 39 to +140°C | Varies |
| Ignition Accessory Signal | ENG, TAC | ON/OFF | ON |
| Ignition Off Time | ENG, EVAP | 0:00:00 | Varies |
| Ignition 1 Signal | ALL | 0-25.5 Volts | 12.8-14.2 Volts |
| Injector PWM Bank 1 or Bank 2 | ENG, FT, HO2S, MF | 0-9 ms | 3.0-5.4 ms |
| Injector 1-8 Disabled Due To Misfire | MF | Yes/No | No |
| Int. CMP Angle Bank 1 or Bank 2 | CMP | Degrees | Varies |
| Int. CMP Bank 1 or Bank 2 Active Counter | CMP, IGN | Counts | Varies |
| Int. CMP Bank 1 or Bank 2 Command | CMP | % | Varies |
| Int. CMP Bank 1 or Bank 2 Variance | CMP | Degrees | Varies |
| Int. CMP Solenoid Bn 1 or Bn 2 Circuit Status | CMP | OK/Incomplete/Short B+/Short Gnd/Open | OK |
| Intake Manifold Pressure | ENG, FT, IND | KPa | Varies |
| Knock Detected Cyl.1-8 | IGN | YES/NO | NO |
| Knock Retard | IGN | 0-191 Degrees | 0 |
| Long Term FT Bank 1 or Bank. 2 | ENG, EVAP, FT, HO2S | 100 to +100% | 7-9% |
| LT FT Test Avg. Bank 1 or Bank 2 | FT | % | 1% |
| LT FT Avg. Bank 1 or Bank 2 w/o purge | FT | % | 1% |
| Loop Status | ENG, EVAP, FT, HO2S | Open/Closed | Closed |
| MAF Performance Test | FT, TAC, IND | OK/Fault | OK |
| MAF Sensor | ALL | 0-655 g/s | 3-7 g/s |
| MAF Sensor | IND | 0-9999 Hz | 28 Hz |
| MAP Performance Test | FT, IND, TAC | OK/Fault | OK |
| MAP Performance Test 1 | FT, IND, TAC | OK/Fault | OK |
| MAP Performance Test 2 | FT, IND, TAC | OK/Fault | OK |
| MAP Sensor | ALL | KPa/psi | 30 kPa (4.6 psi) |
| MAP Sensor | IND | Volts | 1.06 |
| MIL Circuit Status | ENG | OK/Incomplete/Short B+/Short Gnd | OK/Incomplete |
| MIL Command | ENG | On/Off | Off |
| MIL Requested by DTC | ALL | Yes/No | No |
| Misfire Current Cyl. 1-8 | MF | 0-255 Counts | 0 |
| Misfire History Cyl. 1-8 | MF | 0-255 Counts | 0 |
| PNP Switch | ENG | Park/Neutral/In Gear | Park/Neutral |
| Power Enrichment | ENG, FT, HO2S, MF | Active/Inactive | Inactive |
| Reduced Engine Power | TAC | Active/Inactive | Inactive |
| SC Inlet Pressure Sensor | FT, IND | KPa/psi | Varies |
| SC Inlet Pressure Sensor | IND | Volts | Varies |
| SC Inlet Pressure | FT, IND | KPa/psi | Varies |
| SCB Solenoid Circuit Status | IND | OK/Incomplete/Short B+/Short Gnd/Open | OK |
| SBC Solenoid Command | ENG, IND | % | Varies |
| Short Term FT Bank 1 or Bank 2 | ENG, EVAP, FT, HO2S | 100 to +100% | 3% to +3% |
| Spark | ENG, FT, HO2S, IGN, IND, MF | ° | |
| Start Up ECT | EVAP, HO2S | 39 to +140°C/-38 to +284°F | Varies |
| Start Up IAT | EVAP, HO2S | 39 to +140°C/-38 to +284°F | Varies |
| ST FT Test Avg. Bank 1 or Bank 2 | FT | % | |
| TAC Forced Engine Shutdown | TAC | YES/NO | NO |
| TAC Motor | TAC | Enabled/Disabled | Enabled |
| TAC Motor Command | TAC | % | |
| TCS Torque Delivered Signal | TAC | % | 1 % |
| TCS Torque Request Signal | TAC | Nm | |
| TCS Torque Request Signal | TAC | % | |
| Torque Management Spark Retard | IGN | ° | 0 |
| Total Knock Retard | IGN | ° | 0 |
| Total Misfire | MF | 0-9999 | 0 |
| TP Desired Angle | TAC | % | 2 % |
| TP Indicated Angle | ALL | 0-99% | 2-3 % |
| TP Performance Test | IND, TAC, FT | OK/Fault | OK |
| TP Sensor 1 | TAC | 0-5 Volts | 0.5-0.8 Volts |
| TP Sensor 2 | TAC | 0-5 Volts | 4.1-4.5 Volts |
| TP Sensor 1 Indicated Position | TAC | % | 2 % |
| TP Sensor 2 Indicated Position | TAC | % | 2 % |
| TP Sensor 1 Learned Min | TAC | 0-5 Volts | Varies |
| TP Sensor 2 Learned Min | TAC | 5-0 Volts | Varies |
| TP Sensors 1 and 2 | TAC | Agree/Disagree | Agree |
| Vehicle Speed Sensor | ALL | Km/mi | 0 |
| Warm-ups Since DTC Cleared | ENG | Counts | 0 |
| Warm-ups w/o Emission Faults | ENG | Counts | 0 |
| Warm-ups w/o Non-emission Faults | ENG | Counts | 0 |
| Wide Open Throttle | TAC | YES/NO | NO |
Scan Tool Data List
Scan Tool Data Definitions
The Scan Tool Data Definitions list contains a brief description of all of the 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. In some cases the parameter may appear more than once, or in more than one data list in order to group certain related parameters together.
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| CAC Coolant Pump Relay Command | Output Controls | This function activates the charge air cooler (CAC) coolant pump relay. The normal commanded state is NONE. When commanded ON or OFF, the engine control module (ECM) turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool. |
| Cylinder Power Balance | Fuel System | Enables/Disables a cylinder by turning OFF the fuel injector to the cylinder. The fuel injector is normally enabled. The ECM disables the fuel injector when the following conditions are met: All instructions on the scan tool have been completed. Stabilized engine speed Fuel injector selected When the DISABLE is selected the ECM turns the injector OFF for 30 seconds. During this period, the engine operates with a misfire. |
| Engine Controls Ignition Relay | Output Controls | This function activates the engine control ignition relay. The normal commanded state is NONE. When commanded ON or OFF, the ECM turns the relay ON or OFF. The system remains in the commanded state until cancelled by the scan tool. |
| Engine Speed Control | TAC System | Activates the throttle activation control (TAC) system to change engine speed. The normal commanded state is None. To enable the engine speed control, all instruction on the scan tool must be completed. The system will increase or decrease the engine speed within a range of 400-2,200 RPM. The set step value changes the engine speed 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 | Output Controls/EVAP System | Activates the EVAP purge valve. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The system remains in the commanded state until cancelled by the tool or the fuel tank pressure exceeds 24 mm Hg (12 in H20). |
| EVAP Purge/Seal | Output Controls/EVAP System | This control enables 2 functions. One function increases or decreases the amount of purge by changing the duty cycle of the purge valve and commanding the vent ON (non-venting). The normal commanded state of both valves is NONE. The system will INCREASE or DECREASE the amount of EVAP purge valve opening by 10 percent increments within a range of 0-100 percent. The second function seals the system after using the purge function to obtain a specific amount of fuel tank pressure (FTP). When activated the purge valve is commanded to 0 percent and the vent valve is commanded ON (non-venting). Both functions remain in the commanded state until cancelled by the tool or the FTP exceeds 24 mm Hg (12 in H20). |
| EVAP Service Bay Test | Service Bay Tests | Activates the Service Bay Test to verify the integrity of the EVAP System. The scan tool initiates the test when the following conditions are met: All instructions on the scan tool have been completed. The engine coolant temperature is less than a specified value. No DTCs are set. |
| EVAP Vent Solenoid | Output Controls/EVAP System | Activates the EVAP vent solenoid. The normal commanded state is NONE. When commanded ON, the vent valve switches to non-venting. The system remains in the commanded state unless one of the following conditions occurs: Cancelled by the tool Purge is greater than 0 percent, and the fuel tank pressure exceeds 24 mm Hg (12 in H20) |
| Exhaust CMP Actuator Bank 1 | CMP Actuator System | This function controls the exhaust camshaft actuator for bank 1. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 25 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 CMP Actuator Bank 2 | CMP Actuator System | This function controls the exhaust camshaft actuator for bank 2. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 25 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. |
| Exh. CMP Actuator Sol. Bank 1 | CMP Actuator System | This function controls the exhaust camshaft actuator solenoid for bank 1. 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. |
| Exh. CMP Actuator Sol. Bank 2 | CMP Actuator System | This function controls the exhaust camshaft actuator solenoid for bank 2. 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 Injector Balance | Fuel System | Enables fuel injector in order to verify proper fuel injector flow. The ECM also enables the fuel pump. The ECM will pulse the selected injector when the following conditions are met: All instructions on the scan tool have been completed. Fuel injector selected Key ON, engine OFF The selected fuel injector can only be flowed/pulsed once per ignition cycle. |
| Fuel Pump | Output Controls | Controls the fuel pump relay. The normal commanded state is NONE. When commanded ON/OFF, the 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 until cancelled by the scan tool. |
| Fuel Trim Enable | Fuel System | Disables the ECMs ability to learn new fuel trim parameters. The commanded states are NONE, ENABLED, DISABLED. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the scan tool. |
| Fuel Trim Reset | Fuel System | This function activates the reset of fuel trim data in all fuel trim cells. |
| HO2S Bank 1 Sensor 1 Heater | Output Controls/Heated Oxygen Sensors | Activates the HO2S bank 1 sensor 2 heater. The ECM commands the heater on in 10% increments from 0% to 100%. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool. |
| HO2S Bank 1 Sensor 2 Heater | Output Controls/Heated Oxygen Sensors | Activates the HO2S bank 1 sensor 2 heater. The ECM commands the heater on in 10% increments from 0% to 100%. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool. |
| HO2S Bank 2 Sensor 1 Heater | Output Controls/Heated Oxygen Sensors | Activates the HO2S bank 1 sensor 2 heater. The ECM commands the heater on in 10% increments from 0% to 100%. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool. |
| HO2S Bank 2 Sensor 2 Heater | Output Controls/Heated Oxygen Sensors | Activates the HO2S bank 1 sensor 2 heater. The ECM commands the heater on in 10% increments from 0% to 100%. The normal commanded state is NONE. The system remains in the commanded state until cancelled by the tool. |
| Idle Spark | Output Controls/Spark Control | Disables and enables idle spark advance with the engine running. |
| Intake CMP Actuator Bank 1 | CMP Actuator System | This function controls the intake camshaft actuator for bank 1. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 20 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 CMP Actuator Bank 2 | CMP Actuator System | This function controls the intake camshaft actuator for bank 2. The normal commanded state is NONE. The system will increase or decrease the angle of the selected camshaft in 5 degree increments up to 20 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. |
| Int. CMP Actuator Sol. Bank 1 | CMP Actuator System | This function controls the intake camshaft actuator solenoid for bank 1. 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. |
| Int. CMP Actuator Sol. Bank 1 | CMP Actuator System | This function controls the intake camshaft actuator solenoid for bank 2. 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. |
| Loop Status | Output Controls | Controls the system loop status. The commanded states include NONE, OPEN, or CLOSED. The normal commanded state is NONE. When commanded OPEN or CLOSED, the system remains in the commanded state until cancelled by the scan tool. |
| Malfunction Indicator Lamp | Output Controls | Controls the malfunction indicator lamp (MIL). The commanded states include NONE, ON, and OFF. When commanded ON or OFF, the system remains in the commanded state until cancelled by the scan tool. |
| Misfire Graphic | Misfire Graphic | Graphs the accumulated misfires occurring in each cylinder. The scan tool allows for a reset of the misfire graph. |
| SCB Solenoid | Output Controls | Activates the solenoid from the none, increase, and decrease in increments and decrements by 10%. The range is 0-100%. |
| Spark Retard | Output Controls/Spark Control | Controls the amount of spark retard. The normal commanded state is NONE. The system will INCREASE or DECREASE the amount of spark retard by 1 degree increments within a range of 0-10 degrees maximum retard. The system remains in the commanded state until cancelled by the tool. |
| Throttle Position | TAC System | This function opens the throttle plate in 25 percent increments. The scan tool initiates the test when the following conditions are met: The ignition is ON, with the engine OFF. The vehicle speed is 0 km/h (0 mph). The system remains in the commanded state until cancelled by the scan tool. |
Scan Tool Output Controls
See also:
• Diagnostic System Check - Vehicle