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 FUSE 8 (10A)


- Ignition OFF.
- Check fuse: Central Junction Box (CJB) Fuse 8 (10A).
- Is the resistance less than 5 ohms?

Yes
GO to D2 .

No
REPAIR circuit 640 (RD/YE) for a short to ground.

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D2 CHECK CIRCUIT 640 (RD/YE) FOR AN OPEN


- Disconnect: CJB Fuse 8 (10A).
- Disconnect: Transmission Control Switch (TCS) C279.
- Measure the resistance between the output side of fuse 8 (10A), circuit 640 (RD/YE) and TCS C279-1, circuit 640 (RD/YE).




- Is the resistance less than 5 ohms?

Yes
GO to D3.

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

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D3 CHECK THE TCS


- Measure the resistance between TCS C279-1 and C279-2 while cycling the TCS.




- Does the resistance change from less than 5 ohms to greater than 10,000 ohms?

Yes
GO to D4.

No
INSTALL a new selector lever. REFER to Selector Lever Service and Repair. RECONNECT all components. TEST the system for normal operation.

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D4 CHECK CIRCUIT 224 (TN/WH) FOR A SHORT TO GROUND


- Disconnect: PCM C175B.
- Measure the resistance between TCS C279-2, circuit 224 (TN/WH) and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to D5

No
REPAIR circuit 224 (TN/WH) for a short to ground. 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, circuit 224 (TN/WH) and PCM C175B-29, circuit 224 (TN/WH).




- Is the resistance less than 5 ohms?

Yes
INSTALL a new PCM. RECONNECT all components. TEST the system for normal operation.

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

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