The Transmission Fluid Temperature (TFT) sensor provides an electrical signal to the PCM or better known as Powertrain Control Module. Thus, it determines the TCC or Torque Converter Clutch control, shift points, and line pressure
This sensor receives 5 volts of reference voltage from the PCM. In addition, the internal resistance changes accordingly with the transmission fluid temperature, returning a voltage signal to the PCM. When the fluid temperature increases, the resistance decreases since the internal resistance of the sensor is inversely proportional to the oil temperature. Besides, the opposite process occurs when the fluid temperature decreases.
The Check Engine light illuminates next to the OBD2 DTC P0711 when the PCM detects a low performance of the TFT Sensor.