Transmission Fluid Temperature (TFT) Sensor

WARNING: This page is about a different car, the 2009 Mercury Milan and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The Transmission Fluid Temperature (TFT) sensor is located on the internal wiring harness to the solenoid valves in the transmission fluid pan.

It is a resistor and measures the transmission fluid temperature.

The TFT is used by the TCM for the following functions:

applying the TCC is not permitted until the transmission fluid reaches a certain temperature.
engagement of 4th gear is prevented in extreme sub-zero temperatures until the normal operating temperature is reached.
if the transmission fluid temperature is excessive, a pre-set fixed shift curve is selected and the TCC is closed in 2, 3, 4 and 5; of the transmission warning indicator is activated. No substitute signal is available for the TFT sensor.

Fig 1: Brake Shift Interlock Actuator (BSIA)

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	-	Brake Shift Interlock Actuator (BSIA)
2	-	Locking pin
3	-	Manual release mechanism

When the ignition is switched ON, the selector lever Brake Shift Interlock Actuator (BSIA) is actuated by depressing the brake (signal from the BPP switch). This retracts the locking pin so that the selector lever can be moved out of position P.

Fig 2: Substitute Function

Courtesy of FORD MOTOR CO.

If the brake pedal should fail due to malfunction, manual unlocking is possible.

For this, the cover of the release mechanism must be removed and a suitable object (ignition key) pressed into the opening until the selector lever can be moved out of position P.

NOTE: If P is selected again, the selector lever is locked again.