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

Instrumentation, Message Center and Warning Chimes

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 (Electronic Throttle Control) system or in the transmission, the PCM provides the IPC (Instrument Panel Cluster) with a message to turn the powertrain malfunction (wrench) indicator on.

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

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

NOTE: If U0100:87 is set in the IPC (Instrument Panel Cluster) , 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 (Electronic Throttle Control) concern

- Transmission concern

- PCM

- IPC (Instrument Panel Cluster)

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

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

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: IPC (Instrument Panel Cluster) DataLogger.

- Select the IPC (Instrument Panel Cluster) 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 (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) . TEST the system for normal operation.

V2 RETRIEVE THE RECORDED PCM DTCs FROM THE KOEO (Key ON Engine OFF) 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 Information.

No
GO to V3.

V3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded DTCs from the IPC (Instrument Panel Cluster) 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. TEST the system for normal operation.