Transmission Fluid Temperature (TFT) Sensor

The Automatic Transmission Fluid Temperature (TFT) Sensor is part of the Automatic Transmission Fluid Pressure Manual Valve Position (TPF Val. Position) switch assembly. This sensor helps control torque converter clutch apply and shift quality.

The temperature sensor is a resistor, or thermistor, which changes value based on temperature. At low temperatures the resistance is high, and at high temperatures the resistance is low.

The PCM sends a 5-volt signal to the temperature sensor and the PCM measures the voltage drop in the circuit. You will measure a high voltage when the transmission is cold and a low voltage when the transmission is hot.

If the temperature sensor circuit has a fault, code P0712 or P0713 is set. A code P0712 indicates a short circuit condition, while a code P0713 indicates an open circuit condition. Code P1812 is set if the transmission is operating at a high temperature for a period of time.

Refer to TEMPERATURE VS RESISTANCE table, in the specifications.