Transmission Temperature Sensor/Switch: Description and Operation

Wiring Diagram:

PURPOSE
The transaxle controller, located inside the powertrain control module (PCM) receives five signals from various switches and signals and two signals (vehicle speed and engine rpm), internally from the engine control module, also located within the PCM. The PCM uses this information during control of the transaxle shift points.

OPERATION
The transaxle fluid temperature sensor is a thermistor-type sensor located in a transaxle pressure port near the pressure filter. Sensor resistance increases as temperature decreases and decreases as the temperature increases. The PCM supplies a five volt signal to the sensor on circuit 585. The PCM monitors the return signal as it varies up and down with Circuit resistance. The voltage value on the signal line is converted to a temperature value internally by the PCM.


LOCATION
The transaxle fluid temperature sensor is located in a transaxle pressure port near the pressure filter.