Transmission Position Sensor/Switch: Description and Operation

Automatic Transmission Electrical Components:

PURPOSE
This device is a set of five presure switches (two normally closed and three normally open), that detect fluid pressure within the valve body passages and signals the PCM which transmission range is selected (PRNLM).

OPERATION
The five pressure switches are connected to three signal circuits referred to as range signals A, B, C. The combination of pressure switch states determines the voltage signal (B+ or 0) on each range signal to the PCM.

LOCATION
The transmission range fluid pressure switch assembly is attached to the control valve body within the transmission.