Ranger 2WD V6-245 4.0L VIN X SFI (1997)
Transmission Temperature Sensor/Switch: Description and Operation
DESCRIPTION:
The transmission fluid temperature (TFT) sensor is located on the transmission main control body wiring harness assembly. It is a
temperature-sensitive device called a thermistor. The resistance value of the TFT will vary with temperature change. The processor monitors the
voltage across the TFT to determine the temperature of the transmission fluid.
The processor assembly uses this initial signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows
quicker shifts when the transmission fluid temperature is cold. The processor also inhibits torque converter clutch operation at low transmission
fluid temperatures and corrects EPC pressures for temperature.
SYMPTOMS:
Torque converter clutch engagement and stabilized shift schedules happen too soon after a cold start. Harsh or soft shifts.
DIAGNOSTIC TROUBLE CODES:
P0712, P0713, P1711, P1783.