Transmission Temperature Sensor/Switch: Description and Operation
DESCRIPTIONThe Transmission Fluid Temperature (TFT) Sensor is located on the transaxle main control body. It is a temperature-sensitive device called a thermistor. The resistance value of the TFT will vary with temperature change. The powertrain control module (PCM) monitors the voltage across the TFT to determine the temperature of the transaxle fluid.
The PCM uses this initial signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows quicker shifts when the transaxle fluid temperature is cold. The PCM also inhibits torque converter clutch operation at low transaxle fluid temperatures. Corrects electronic pressure control (EPC) pressures for temperature.
SYMPTOMS
Torque converter clutch engagement and stabilized shift schedules happen too soon after a cold start. Harsh or soft shifts.
DTC's
P0712, P0713, P1711, P1783