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

Instrumentation, Message Center and Warning Chimes

Pinpoint Test Y: 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). The O/D off switch is hardwired to the PCM through circuit 224 (TN/WH). When the transmission overdrive is turned off, the overdrive off switch provides a voltage signal to the PCM. The PCM, upon receipt of the overdrive off input signal, provides an O/D off signal to the IC and the IC turns on the O/D OFF indicator.

This pinpoint test is intended to diagnose the following:

- Transmission O/D off function
- PCM
- IC



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

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Y1 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 DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to Y2.

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Y2 CHECK THE O/D OPERATION


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

Yes
GO to Y3.

No
REFER to Automatic Transmission/Transaxle. Testing and Inspection

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Y3 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 lamps (ALL_LAMP) active command 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. 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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