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

Instrumentation, Message Center and Warning Chimes

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

Normal Operation

The Instrument Panel Cluster (IPC) receives the O/D (Overdrive) 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 (Overdrive) function is selected off, the TCM (Transmission Control Module) sends a message to the IPC (Instrument Panel Cluster) to illuminate the O/D (Overdrive) off indicator.

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

If the O/D (Overdrive) off message is missing for more than 5 seconds, DTC U0101:00 sets in continuous memory and defaults the O/D (Overdrive) off indicator off.

This pinpoint test is intended to diagnose the following:

- Transmission concern

- PCM

- IPC (Instrument Panel Cluster)

PINPOINT TEST AB : THE O/D (Overdrive) OFF INDICATOR IS NEVER/ALWAYS ON

AB1 CHECK THE OPERATION OF THE O/D (Overdrive) OFF FUNCTION

- Verify that the O/D (Overdrive) function operates correctly.

Does the O/D (Overdrive) function correctly?

Yes
GO to AB2.

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

AB2 CHECK THE O/D (Overdrive) OFF INDICATOR USING THE IPC (Instrument Panel Cluster) DEALER TEST MODE

- Ignition ON.

- Enter Instrument Panel Cluster (IPC) Dealer Test Mode.

- Scroll down to the telltale test (base IPC (Instrument Panel Cluster)) or TELLTALE TEST (message center IPC (Instrument Panel Cluster)) displays.

- Monitor the O/D (Overdrive) OFF indicator.

Is the O/D (Overdrive) OFF indicator illuminated?

Yes
GO to AB3.

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

AB3 RETRIEVE THE RECORDED DTCs FROM THE IPC (Instrument Panel Cluster) SELF-TEST

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

Is DTC U0101:00 recorded?

Yes
GO to Pinpoint Test AV. Pinpoint Test AV: DTC U0101:00

No
GO to AB4.

AB4 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 the Diagnostic Trouble Code (DTC) Chart in Body Control Systems. Body Control Systems

No
INSTALL a new PCM. TEST the system for normal operation.