Transmission Temperature Sensor/Switch: Testing and Inspection

DESCRIPTION
The Transmission Fluid Temperature (TFT) Sensor is located on the transaxle main control valve body. It is a temperature-sensitive device called a thermistor. The resistance value of the TFT will vary with transmission fluid temperature change. The powertrain control module monitors the voltage across the TFT to determine the temperature of the transmission fluid. The powertrain control module uses this signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows quicker shifts when the transmission fluid is cold. The Powertrain Control Module (PCM) also inhibits torque converter clutch operation at low transmission 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