Pinpoint Test W: The Overdrive (O/D) Off Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests


Pinpoint Test W: The Overdrive (O/D) Off Indicator is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the Overdrive (O/D) off status from the Transmission Control Module (TCM) (part of the PCM) over the High Speed Controller Area Network (HS-CAN) communication bus. When the O/D function is selected off, the TCM sends a message to the IPC to illuminate the O/D off indicator.

If the O/D off message is missing for less than 5 seconds, the O/D off indicator remains in the last on/off state, based upon the last known good O/D off message received.

If the O/D off message is missing for more than 5 seconds, DTC U0101:87 sets in continuous memory and defaults the O/D off indicator off.

This pinpoint test is intended to diagnose the following:

- Transmission concern
- PCM
- IPC



PINPOINT TEST W: THE O/D OFF INDICATOR IS NEVER/ALWAYS ON

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W1 CHECK THE OPERATION OF THE O/D OFF FUNCTION


- Verify that the O/D function operates correctly.
- Does the O/D function correctly?

Yes
GO to W2.

No
REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems.

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W2 CARRY OUT THE IPC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC Overdrive (O/D) OFF (OVERDRV) active command on and off while monitoring the O/D OFF indicator.
- Monitor the O/D indicator.
- Does the O/D OFF indicator illuminate when commanded on, and turn off when commanded off?

Yes
GO to W3.

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

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W3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Is DTC U0100:87 recorded?

Yes
GO to Pinpoint Test AQ. Pinpoint Tests AQ: DTC U0100:87

No
GO to W4.

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W4 RETRIEVE THE RECORDED TCM DTCs FROM THE SELF-TEST


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

Yes
REFER to the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Diagnostic Trouble Code (DTC) Chart

No
INSTALL a new PCM. REFER to Computers and Control Systems. TEST the system for normal operation.

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