Expedition 4WD V8-281 4.6L SOHC (1998)
Transmission Temperature Sensor/Switch: Description and Operation
Transmission Temperature Sensor/Switch, A/T
TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR
The Transmission Fluid Temperature (TFT) sensor is located on the lead frame assembly near the shift solenoids on the main control valve body. It is
a temperature sensitive device called a thermister. It sends a voltage signal to the Powertrain Control Module (PCM). The voltage signal varies with
transmission fluid temperature. The PCM uses this signal to determine whether a cold start shift schedule is necessary. The shift schedule is
compensated when the transmission fluid temperature is cold. The PCM also inhibits Torque Converter Clutch (TCC) operation at low transmission
fluid temperatures and corrects electronic pressure control.
