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Home >> Lincoln >> 2019 >> MKZ Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Automatic Transmission - 6-Speed Automatic Transmission - 6F50/6F55 (1 Of 2)) >> Description And Operation >> Transmission Description - System Operation and Component Description >> Component Description >> Sensors and Switches

Sensors and Switches

WARNING: This page is about a different variant/trim than selected.

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 The TSS sensor is a Hall-effect type sensor that provides a TSS signal to the PCM. The TSS signal changes in frequency as the rotating speed of the trigger wheel, part of the direct clutch cylinder, varies. The TSS information is compared to engine rpm to determine TSS performance. The TSS is also compared to the OSS to determine shift quality and clutch performance.
OSS Sensor The OSSsensor is a Hall-effect type sensor that provides an OSS signal to the PCM. The OSS signal changes in frequency as the rotating speed of the final drive input gear varies. The OSS is used for shift scheduling. The OSS is also compared to the TSS to determine shift quality and clutch performance.
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