Transmission Position Sensor/Switch: Description and Operation

PURPOSE
The Transmission Range (TR) sensor provides an input signal to the Powertrain Control Module (PCM), notifying the PCM of the current transmission shift lever position.

Schematic:

CONSTRUCTION
The TR sensor has six separate resistors in series. Each resistor has an output connection corresponding to a transmission position (P, R, N, D, 1, 2). The output wiper arm is linked directly to the transmisssion selector linkage.

OPERATION
The PCM applies a 5.0 volt reference signal to the TR circuit pin 30. SIG RTN circuit pin 46 supplies a ground path to the sensor. As the transmission is shifted the TR sensor output wiper arm moves to a corresponding resistor connection. The six inline resistors provide a separate voltage drop for each transmission position.

RELATED DIAGNOSTIC TROUBLE CODES

DTC 634 - The TR sensor was out of self-test range with the transmission in park.

DTC 522/654 - The gear selector was not in park during the self-test.