Transmission Position Sensor/Switch: Description and Operation

OPERATION

NOTE: The rotary position switch is NOT adjustable.

1. The position of the gear selector lever is detected by the range senor; a system which consists of two (2) sensors (switch systems), as follows:
a. The rotary position switch, which is located on the Right Hand (RH) side of the transmission case and is coaxial with the selector shaft.
b. The D to 4 (micro) switch, which is mounted in the 'J gate' assembly.
When the selector is moved across the gate to engage 4, or back from that side towards D the selector cable does not move. In order that this change of state be registered by the Transmission Control Module (TCM) the D to 4 switch is incorporated.

MONITORING PROCEDURE
The rotary switch in isolation provides a 4-bit code, which, when added to the D to 4 switch becomes a 5-bit code. The TCM will make a failure judgement if it detects an 'illegal' code.
The TCM monitors the gear position during cranking, if the indicated position is not P or N a failure judgement will be made.