Pinpoint Test S: The Overdrive Off Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test S: The Overdrive Off Indicator Is Never/Always On

Normal Operation

The Instrument Panel Cluster (IPC) receives the overdrive off indicator request from the Transmission Control Module (TCM) over the High Speed Controller Area Network (HS-CAN) communication bus. When the overdrive off function is selected, the TCM sends a request to the IPC to illuminate the overdrive off indicator.

If the overdrive off request is missing or if the data is deemed invalid for less than 5 seconds, the overdrive off indicator remains in the last indication mode (on or off) based on the last known good request received. If the overdrive off request is missing or if the data is deemed invalid by the IPC for more than 5 seconds, the IPC sets DTC U0101:00 in continuous memory and defaults the overdrive off indicator off.

This pinpoint test is intended to diagnose the following:

- Overdrive function concern
- TCM
- IPC

PINPOINT TEST S: THE OVERDRIVE OFF INDICATOR IS NEVER/ALWAYS ON

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S1 CHECK THE OPERATION OF THE OVERDRIVE OFF FUNCTION

- Verify that the overdrive off function operates when engaged and turns off when disengaged. Refer to Automatic Transaxle/Transmission External Controls External Controls.
- Does the overdrive off function operate correctly?

Yes
GO to S2.

No
REFER to Automatic Transaxle/Transmission External Controls Testing and Inspection.

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S2 CARRY OUT THE IPC OVERDRIVE OFF INDICATOR ACTIVE COMMAND USING THE SCAN TOOL

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

Yes
GO to S3.

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

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S3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

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

Yes
GO to Pinpoint Test AM. Pinpoint Tests AM: DTC U0100:00 and P1607:87

No
GO to S4.

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S4 RETRIEVE THE RECORDED DTCs FROM THE TCM SELF-TEST

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

Yes
REFER to Computers and Control Systems.

No
INSTALL a new TCM. REFER to Automatic Shifting Manual Transmission/Transaxle Transmission Control Module (TCM). TEST the system for normal operation.

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