Pinpoint Test C: Transmission Control Switch (TCS) Is Not Operating Correctly

C1 CHECK I/P FUSE 26
- Key in OFF position.
- Check fuse: I/P Fuse 2.13 (5A).
- Is the resistance 5 ohms or less?
- Yes : REINSTALL the fuse. GO to C3.
- No : INSTALL a new fuse. TEST the system for normal operation. If the fuse fails again, GO to C2.
C2 CHECK THE CIRCUIT FOR A SHORT TO GROUND
- Disconnect: Powertrain Control Module (PCM).
- Measure the resistance between pin 41 and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to C3.
- No : REPAIR circuit. TEST the system for normal operation.
C3 CHECK THE TRANSMISSION CONTROL SWITCH (TCS) CIRCUIT FOR VOLTAGE
- Disconnect: Powertrain Control Module (PCM).
- Leave PCM disconnected
- Key in ON position.
- Measure the voltage between pin 41 and ground while cycling the TCS switch several times.
- Does the voltage cycle?
- Yes : INSTALL a new PCM. TEST the system for normal operation.
- No : GO to C4.
C4 CHECK THE CIRCUIT FOR AN OPEN
- Key in OFF position.
- Disconnect: Central Junction Box (CJB).
- Disconnect: Transmission Control Switch (TCS).
- Measure the resistance between the CJB fuse 2.13 (5A) pin 10 and the power side of the TCS pin 2 vehicle harness connector.
- Measure the resistance between the CJB fuse 2.13 (5A) pin 10 and the power side of the TCS pin 1 vehicle harness connector circuit.
- Is the resistance less than 5 ohms for both circuits?
- Yes : GO to C5.
- No : REPAIR open circuit. TEST the system for normal operation.
C5 CHECK THE CIRCUIT FOR A SHORT TO POWER
- Measure the resistance between pin 41 and pin 1.
- Is the resistance greater than 10,000 ohms?
- Yes : INSTALL a new transmission control switch. RECONNECT all components. TEST the system for normal operation.
- No : REPAIR circuit. TEST the system for normal operation.