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

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

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

Normal Operation

The Overdrive (O/D) off function is controlled by the O/D off switch located on the shifter assembly. The Instrument Cluster (IC) receives the overdrive off message from the PCM through the communication network. When the transmission overdrive is selected off, the overdrive off switch provides a ground signal to the PCM. The PCM, upon receipt of the overdrive off ground signal, provides an overdrive off message to the IC and the IC illuminates the O/D off indicator.

This pinpoint test is intended to diagnose the following:

- PCM
- IC



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

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T1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS


- Check for recorded PCM DTCs from the continuous and on-demand self-tests.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
GO to T2.

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T2 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 (OVERDRV) active command on and off while monitoring the O/D OFF indicator.
- Does the O/D/D OFF indicator illuminate when commanded on, and turn off when commanded 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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