Pinpoint Test V: The Powertrain Malfunction (Wrench) Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test V: The Powertrain Malfunction (Wrench) Warning Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the powertrain malfunction data from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The PCM monitors the Electronic Throttle Control (ETC) system status and transmission status. When a fault condition exists in the ETC system or in the transmission, the PCM provides the IPC with a message to turn the powertrain malfunction (wrench) indicator on.

If the ETC or transmission message is missing for less than 5 seconds, the IPC defaults the powertrain malfunction (wrench) indicator to the last on/off state, based upon the last known good ETC or transmission message received.

If the ETC or transmission message is missing for more than 5 seconds or longer, the IPC sets DTC U0100:87 and defaults the powertrain malfunction (wrench) warning indicator on.

NOTE: If U0100:87 is set in the IPC, other symptoms can also be present such as an inoperative speedometer, tachometer or temperature gauge.

This pinpoint test is intended to diagnose the following:

- ETC concern
- Transmission concern
- PCM
- IPC

PINPOINT TEST V: THE POWERTRAIN MALFUNCTION (WRENCH) WARNING INDICATOR IS NEVER/ALWAYS ON

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V1 CHECK THE POWERTRAIN MALFUNCTION (WRENCH) OFF INDICATOR USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC powertrain malfunction (wrench) indicator (TRANSA_LMP) active command.
- Command the powertrain malfunction (wrench) indicator on and off while observing the powertrain malfunction (wrench) indicator.
- Does the powertrain malfunction (wrench) indicator illuminate when selected on, and turn off when selected off?

Yes
GO to V2.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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V2 RETRIEVE THE RECORDED PCM DTCs FROM THE KOEO SELF-TEST


- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any DTCs recorded?

Yes
DIAGNOSE all PCM DTCs first. REFER to Computers and Control Systems.

No
GO to V3.

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V3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?

Yes
For DTC U0100:87, GO to Pinpoint Test AQ. Pinpoint Test AQ: DTC U0100:87

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center, and Warning Chimes

No
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair . TEST the system for normal operation.

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