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

Instrumentation, Message Center and Warning Chimes

Pinpoint Test

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

Normal Operation

The Transmission Control Module (TCM) monitors the Overdrive (O/D) off switch status. When the O/D function is selected off, the TCM sends a message to the Instrument Cluster (IC) over the communication network to turn on the O/D OFF indicator.

This pinpoint test is intended to diagnose the following:

- TCM
- IC



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

-------------------------------------------------
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

-------------------------------------------------
Z2 RETRIEVE THE RECORDED DTCs FROM THE TCM SELF-TEST


- Check for recorded TCM DTCs from the self-test.
- Are any TCM DTCs recorded?

Yes
REFER to Transmission Control Systems. Testing and Inspection

No
GO to Z3.

-------------------------------------------------
Z3 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 Active Command.
- Select the IC indicator lamp control (ALL_LAMP) active command. Command all the lamps 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
INSTALL a new TCM. 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.

-------------------------------------------------