95 1/2 Model

This Diagnostic Trouble Code (DTC) flashes the "CHECK TRANS" Indicator and sets the Backup Mode.




Circuit Description
- The Mode Switch supplies the Transmission Control Module (TCM) with information regarding the Selector Lever position: P, R, N, D, 3, 2 or L. The Selector Lever position is indicated by the state of four "ON"/"OFF" contacts. The Mode Switch is located on one side of the Transmission. It is on the Transmission Manual Shaft and is fixed to the main case.
- The Mode Switch is also used to provide the information P or N to the Engine crank wiring. The Engine can be cranked only if connector A-32 terminal 4-H is connected to terminal 1-E, which is connected to ground.
- The Mode Switch is also used to provide the back up lamp power in reverse, This is the reason why the Mode Switch is supplied through a 15A fuse (CB-15). This fuse can burn due to short circuit in the back up lamp.
- When this fuse is open, the mode switch does not work and DTC 54 is set.
- The Mode position is defined by the shift linkage which is a link between the Shift Lever and the Mode Switch. A bad adjustment of the shift linkage can create a Mode Switch problem (DTC 53).

Diagnostic Aids
- This Diagnostic is an electrical test done by the TCM.

- Detection Conditions:
a. Selector Pin A and Pin B and Pin C are not active: no position is identified then.
b. Based upon Table 1, in Park Shift Selector position, the code is set when the Pin A is open or shorted to ground.
c. The conditions need to be present for at least 5 seconds.

- Action After The Detection Time:
- Backup Mode.

- Recovery Conditions:
- To recover do an Ignition Cycle.








DTC 54 / Flow Chart