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

Pinpoint Test I: Transmission Control Switch (TCS) Is Not Operating Correctly
Normal Operation
When the TCS switch is depressed the transmission will either disengage or engage the overdrive function.

Test I1 - I3:

Test I4 - I5:

Possible Causes
When the TCS switch is depressed and the transmission will not disengage or engage the overdrive function, the possible causes are:
- Blown fuse
- Short to ground
- Short to open
- Faulty switch
- Wiring, terminals or connectors