Transmission Temperature Sensor/Switch: Description and Operation

Transmission Fluid Temperature (TFT) Sensor:

PURPOSE
Used as an input to determine shift schedule and Electronic Pressure Control (EPC) for temperature effects.


DESCRIPTION
The Transmission Fluid Temperature (TFT) sensor is a temperature-sensitive device called a thermistor it is located in the solenoid body assembly it sends a voltage signal to the Powertrain Control Module (PCM). The voltage signal varies with the transmission fluid temperature.

OPERATION
The PCM uses the voltage signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule lowers shift speeds to allow for the reduced performance of cold engine operation. The TFT is part of the transmission solenoid assembly and is not replaced separately.