Transmission Temperature Sensor (TTS) (4T60-E Transmission)

TTS is a thermistor (temperature sensitive resistor) mounted to the transmission valve body. The PCM/VCM supplies and monitors a 5-volt signal to TTS. This monitored 5-volt signal is then modified by resistance of TTS. When transmission fluid temperatures are low, TTS resistance is high and PCM/VCM sees a high monitored voltage signal. When transmission fluid temperatures are high, TTS resistance is low and PCM/VCM sees a low monitored voltage.

PCM/VCM uses transmission fluid temperature input to control torque converter clutch application and shift quality. Sensor circuit problem should set a related trouble code.