95 1/2 Model

This Diagnostic Trouble Code (DTC) does not flash the "CHECK TRANS" Indicator and does not set 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 not an electrical test done by the TCM but a test between different information ("logic test").

- Detection Conditions of P or N Bad Position:
a. Automatic Transmission (A/T) Input Speed is less than 3000 rpm.
b. Throttle Position Sensor (TPS) is more than 10%.
c. Mode Switch equals P or N.
d. No malfunction: TPS short to voltage or ground (DTC 21, DTC 22), Engine Speed (DTC 13).
e. The conditions need to be present for at least 4 seconds.

- Action After The Detection Time:
- Default position assumed for pressure calculation and shift pattern equals always in D.

- Recovery Conditions:
- To recover, have the Engine speed higher than 3000 rpm with a TPS higher than 10% when the Mode Switch is not in P or N.

- Detection Conditions Of R Bad Position:
a. A/T Output Speed is greater than 3200 rpm (approx. 100 kph).
b. Mode Switch equals R.
c. No malfunction: Output speed (DTC 11). Downshift Protection (DTC 62).
d. The conditions need to be present for at least 4 seconds.

- Action After The Detection Time:
- Default position assumed for pressure calculation and shift pattern equals always in D.

- Recovery Conditions:
- To recover, have the output speed higher than 3200 rpm when the Mode Switch is not in R.









DTC 53 / Flow Chart