Pinpoint Test D: The TCS Does Not Operate Correctly

External Controls

Pinpoint Tests

Refer to Wiring Diagram Set 29, Transmission Controls for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 37, Shift Interlock for schematic and connector information. Diagrams By Number



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) 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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