Pinpoint Test S: The Powertrain Malfunction (Wrench) Warning Indicator Is Never/Always On
- S1 OBSERVE THE INDICATOR
- Key in ON position.
- Start the vehicle. Observe the powertrain malfunction (wrench) warning indicator.
- Is the indicator illuminated?
Yes : GO to S2.
No : GO to S9.
- S2 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS
- Check for recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any PCM DTCs recorded?
Yes : REFER to the INTRODUCTION - GASOLINE article to continue diagnosis of the DTCs.
No : GO to S3.
- S3 RETRIEVE THE RECORDED DIAGNOSTIC TROUBLE CODES (DTCs) FROM BOTH THE CONTINUOUS AND ON-DEMAND TCM SELF-TESTS
- Check for recorded TCM DTCs from the continuous and on-demand self-tests.
- Are any TCM DTCs recorded?
Yes : REFER to AUTOMATIC TRANSMISSION - 6 SPEED to continue diagnosis of the DTCs.
No : GO to S4.
- S4 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Instrument Cluster Active Command.
- Select the instrument cluster indicator lamp control active command. Trigger the powertrain malfunction (wrench) warning indicator active command on and off. Observe the indicator.
- Does the powertrain malfunction (wrench) warning indicator illuminate when triggered on, and turn off when triggered off?
Yes : GO to S5.
No : GO to S9.
- S5 CHECK THE INSTRUMENT CLUSTER TCM REQUEST PID
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Instrument Cluster PID.
- Select and monitor the instrument cluster TCM PID.
- Does the TCM PID read YES?
Yes : GO to S7.
No : GO to S6.
- S6 CHECK THE INSTRUMENT CLUSTER ELECTRONIC THROTTLE CONTROL REQUEST PID
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Instrument Cluster PID.
- Select and monitor the instrument cluster electronic throttle control request PID.
- Does the electronic throttle control request PID read YES?
Yes : GO to S8.
No : GO to S9.
- S7 CHECK FOR CORRECT TCM OPERATION
- Disconnect all the TCM connectors.
- Check for:
- Corrosion
- Pushed-out pins
- Connect all the TCM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes : INSTALL a new TCM. REFER to AUTOMATIC TRANSMISSION - 6 SPEED . TEST the system for normal operation.
No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
- S8 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- Corrosion
- Pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - 2.3L , or ELECTRONIC ENGINE CONTROLS - 3.0L (4V) . TEST the system for normal operation.
No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
- S9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
- Corrosion
- Pushed-out pins
- Connect the instrument cluster connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.