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 (Transmission Control Module) sends a request to the IPC (Instrument Panel Cluster) 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 (Instrument Panel Cluster) for more than 5 seconds, the IPC (Instrument Panel Cluster) 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 (Transmission Control Module)

- IPC (Instrument Panel Cluster)

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

S1 CHECK THE OPERATION OF THE OVERDRIVE OFF FUNCTION

- Verify that the overdrive off function operates when engaged and turns off when disengaged.

Does the overdrive off function operate correctly?

Yes
GO to S2.

No
REFER to Automatic Transmission/Transaxle.

S2 CARRY OUT THE IPC (Instrument Panel Cluster) OVERDRIVE OFF INDICATOR ACTIVE COMMAND 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) 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 (Instrument Panel Cluster). REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

S3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

- Check for recorded IPC (Instrument Panel Cluster) DTCs from the self-test.

Is DTC U0100:00 recorded?

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

No
GO to S4.

S4 RETRIEVE THE RECORDED DTCs FROM THE TCM (Transmission Control Module) SELF-TEST

- Check for recorded TCM (Transmission Control Module) DTCs from the self-test.

Are any DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
INSTALL a new TCM (Transmission Control Module). TEST the system for normal operation.