Transmission Temperature Sensor/Switch: Description and Operation

Transmission Range Pressure Switch Assembly Circuit.:

PURPOSE
The Transmission Fluid Temperature (TFT) sensor is a thermistor used to indicate transmission fluid temperature.

The TFT sensor is utilized by the PCM to determine the following:
^ TCC apply and release schedules
^ Hot mode determination
^ Transmission shift quality

OPERATION
High sensor resistance produces high signal input voltage which corresponds to low fluid temperature. Low sensor resistance produces low signal input voltage which corresponds to high fluid temperature.

LOCATION
The TFT sensor is part of the transmission range fluid pressure switch assembly. The assembly is attached to the valve body inside the transmission.