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

Instrumentation, Message Center and Warning Chimes

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

Normal Operation

The Overdrive (O/D) off indicator is controlled by the Instrument Cluster (IC) using data sent from the PCM over the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Transmission Overdrive (O/D) off function
- PCM
- IC


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

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T1 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Retrieve the recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems.

No
GO to T2.

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T2 CHECK THE O/D OPERATION


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

Yes
GO to T3.

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

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T3 CARRY OUT THE IC INDICATOR LAMP ACTIVE COMMAND USING THE SCAN TOOL


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

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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

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