Pinpoint Test Z: The O/D Off Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test Z: The 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 on/off 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:

- O/D concern
- PCM
- IC



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

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Z1 CHECK THE OPERATION OF THE O/D OFF FUNCTION


- Test drive the vehicle while turning the O/D function on and off.
- Does the O/D function correctly?

Yes
GO to Z2.

No
Refer to Transmission Control Systems. Testing and Inspection

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Z2 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 O/D OFF indicator (OVERDRV) 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 commanded on, and turn off when commanded off?

Yes
GO to Z3.

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

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Z3 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS


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

Yes
For DTC U0100, Go To Pinpoint Test AE. Pinpoint Tests AE: DTC U0100

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to Z4.

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Z4 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 DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

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

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