Code 54

This 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 C-43 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 (C-3). 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 DTC54 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 (DTC53).

DIAGNOSTIC AIDS:
- This Diagnostic is an electrical test done by the TCM.
- Detection conditions:
- Selector Pin A and Pin B and Pin C are not active: no position is identified then.
- Based upon Table 1, in Park shift selector position the code is set when Pin A is open or shorted to ground.
- 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.