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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The Instrument Cluster (IC) receives the Overdrive (O/D) off signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the O/D function is selected off, the PCM sends a message to the IC to illuminate the O/D off indicator. If the O/D status message is missing or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the O/D off indicator off.

NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



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

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X1 CHECK THE O/D OPERATION


- Verify that the O/D function works when selected on and turns off when selected off.
- Does the O/D function operate correctly?

Yes
GO to X2.

No
REFER to Automatic Transmission/Transaxle.

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X2 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC O/D off indicator (O_DOFFLMP) active command and command the O/D off indicator on and off. Observe the O/D off indicator.
- Does the O/D off indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to X3.

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

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X3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
GO to Pinpoint Test AU. Pinpoint Tests AU: DTC U0100

No
GO to X4.

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X4 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 PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

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

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