Pinpoint Test D: The TCS Does Not Operate Correctly

External Controls

Pinpoint Tests

PINPOINT TEST D: THE TCS DOES NOT OPERATE CORRECTLY

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D1 CHECK CJB FUSE 26 (10A)


- Check fuse: Central Junction Box (CJB) 26 (10A).
- Is the resistance less than 5 ohms?

Yes
GO to D2.

No
GO to D3.

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D2 CHECK TCS SYSTEM


- Disconnect: PCM C175B.
- Ignition ON.
- Measure the voltage between PCM C175B-29 and ground while cycling the Transmission Control Switch (TCS).




- Does the voltage cycle from 0 volt to 12 volts?

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

No
GO to D3.

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D3 CHECK CIRCUIT 640 (RD/YE) FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: CJB Fuse 26 (10A).
- Disconnect: PCM C175B.
- Disconnect: TCS C279.
- Measure the resistance between the output side of CJB fuse 26 (10A) and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to D4.

No
REPAIR circuit 640 (RD/YE) for a short to ground. REINSTALL all components. TEST the system for normal operation.

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D4 CHECK CIRCUIT 640 (RD/YE) FOR AN OPEN


- Measure the resistance between the output side of CJB fuse 26 (10A) and TCS C279-1, circuit 640 (RD/YE), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to D5.

No
REPAIR circuit 640 (RD/YE) for an open. RECONNECT all components. TEST the system for normal operation.

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D5 CHECK CIRCUIT 224 (TN/WH) FOR AN OPEN


- Measure the resistance between TCS C279-2 and PCM C175B-29, circuit 224 (TN/WH), harness side.




- Is the resistance less than 5 ohms?

Yes
GO to D6.

No
REPAIR circuit 224 (TN/WH) for an open. RECONNECT all components. TEST the system for normal operation.

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D6 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO GROUND


- Measure the resistance between TCS C279-2, circuit 224 (TN/WH), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new selector lever. REFER to Selector Lever Service and Repair. RECONNECT all components. TEST the system for normal operation.

No
REPAIR circuit 224 (TN/WH) for a short to ground. RECONNECT all components. TEST the system for normal operation.

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