Seville V8-273 4.5L (1989)
Transmission Temperature Sensor/Switch: Description and Operation
Transmission Temperature Sensor
The Transmission Temperature Sensor is mounted in the transmission cooler line. The sensor measures the temperature of the transmission fluid as it
leaves the transaxle and provides this information to the Electronic Control Module (ECM). The Transmission Temperature Sensor is a thermistor
whose resistance changes as a function of temperature. When the temperature is low, the resistance is high. The resistance decreases as the temperature
increases. The Transmission Temperature Sensor is a two wire sensor, which receives a voltage signal from the ECM to one sensor pin and a reference
ground at the other sensor pin.