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

Instrumentation, Message Center and Warning Chimes

Pinpoint Test Q: 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 and the transmission status from the Transmission Control Module (TCM) over the High Speed Controller Area Network (HS-CAN) communication bus. When a fault condition exists in the PCM, the PCM sends a request to the IPC to illuminate the powertrain malfunction (wrench) warning indicator. When a fault occurs in the transmission, the TCM sends a request to the IPC to illuminate the powertrain malfunction (wrench) warning indicator.

If the powertrain malfunction (wrench) warning indicator request message is missing from the PCM or TCM for 5 seconds or less, the powertrain malfunction (wrench) warning indicator remains in the last indication mode (on or off) based upon the last known good request received. If the powertrain malfunction (wrench) warning indicator request message is missing from the PCM for more than 5 seconds, the IPC sets DTC U0100:00 and defaults the powertrain malfunction (wrench) warning indicator on. If the powertrain malfunction (wrench) warning indicator request message is missing from the TCM for more than 5 seconds, the IPC sets DTC U0101:00 and defaults the powertrain malfunction (wrench) warning indicator on.

NOTE: If U0100:00 sets in the IPC other symptoms may also be present such as an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- ETC concern
- Transmission concern
- IPC

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

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Q1 CARRY OUT THE IPC POWERTRAIN MALFUNCTION (WRENCH) INDICATOR ACTIVE COMMAND USING THE SCAN TOOL

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

Yes
GO to Q2.

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

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Q2 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Is DTC U0100:00 or DTC U0101:00 recorded?

Yes
For DTC U0100:00, GO to Pinpoint Test AM. For DTC U0101:00, GO to Pinpoint Test AN. Pinpoint Tests AM: DTC U0100:00 and P1607:87 Pinpoint Tests AN: DTC U0101:00

No
GO to Q3.

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Q3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

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

Yes
REFER to Computers and Control Systems.

No
REFER to Automatic Shifting Manual Transmission/Transaxle Testing and Inspection to diagnose TCM DTCs.

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