Sensors and Switches
WARNING: This page is about a different car, the 2013 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
The PCM controls the electronic functions of this transmission. The PCM receives input signals from engine and transmission sensors and uses these inputs to control line pressure, shift time, TCC and shift solenoids.
| Item | Description |
|---|---|
| TFT Sensor | This sensor is located in the transmission solenoid body. It is a temperature-sensitive device called a thermistor. The resistance value of the TFT
sensor will vary with temperature change. The PCM monitors the voltage across the TFT
sensor to determine the temperature of the transmission fluid. The PCM uses this initial signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows delayed shifts when the transmission fluid is cold to help warm the transmission fluid. The PCM also inhibits TCC operation at low transmission fluid temperatures and adjusts line pressure for temperature. |
| TR Sensor | The TR sensor has a 6-pin electrical connector. The TR sensor is located on the inside of the transmission at the manual control lever. The TR sensor sends a signal to the PCM to start the vehicle in PARK and NEUTRAL. The TR sensor opens/closes a set of 4 switches that are monitored by the PCM to determine the position of the manual control lever. |
| TSS Sensor | This TSS sensor is a Hall-effect pickup that sends a signal to the PCM that indicates transmission turbine shaft input speed. The TSS information is compared to engine rpm to determine TCC performance. TSS is also compared to OSS to determine shift quality and clutch performance. |
| OSS Sensor | The OSS sensor is a Hall-effect pickup, located on the transfer shaft drive gear, that sends a signal to the PCM to indicate transmission output speed. The OSS is used for shift scheduling. OSS is also compared to TSS to determine shift quality and clutch performance. |