Circuit Description

Transmission Fluid Temperature (TFT) sensor is a negative coefficient thermistor within TFP manual valve position switch. TFT sensor controls signal voltage from PCM. The PCM supplies a 5-volt reference signal to sensor. When transmission fluid temperature is cold, sensor resistance is high, and PCM detects high signal voltage. As transmission fluid temperature increases, sensor resistance decreases and detected voltage decreases. DTC P0711 is set if PCM detects a large change in transmission fluid temperature or if PCM detects a TFT value which remains constant for a period of time in which a measurable amount of change is expected for 2 consecutive ignition cycles.