Test R: Powertrain Malfunction (Wrench) Warning Indicator Is Never/Always On (Base Instrument Cluster)

Pinpoint Test R: The Powertrain Malfunction (Wrench) Warning Indicator is Never/Always On (Base Instrument Cluster)





Normal Operation
The instrument cluster receives the powertrain status from the powertrain control module (PCM) over the high speed controller area network (HS-CAN). When a system concern is detected, the PCM sends the instrument cluster a command signal to illuminate the powertrain malfunction (wrench) warning indicator. If the 4WD control module detects a failure with the 4WD drive system, the 4WD control module sends a message to the instrument cluster over the CAN to illuminate the powertrain malfunction (wrench) warning indicator. On 4.6L engines, if the transmission control module (TCM) detects a failure with the transmission, the TCM sends a message to the instrument cluster over the CAN to illuminate the powertrain malfunction (wrench) warning indicator.

Possible Causes
- 4WD system
- PCM
- TCM (4.6L engine)
- instrument cluster