Code 53

This 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 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 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/T Input Speed < 3000 RPM
- TPS > 10%
- Mode Switch = P or N
- No malfunction: TPS short to voltage or ground (DTC 21, DTC22), Engine Speed (DTC13).
- 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 = 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/T Output Speed > approx. 100 KPH
- Mode Switch = R
- No malfunction: Output speed (DTC11).
Downshift Protection (DTC62).
- The conditions need to be present for at least 1 second
- Action after the detection time: Default position assumed for pressure calculation and shift pattern = always in D.
- Recovery conditions: To recover, have the output speed higher than 100 KPH when the mode switch is not R.