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 main control. 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 dual TR sensor assembly is an internally mounted sensor located on the manual control lever shaft. The dual TR sensors are Hall-effect sensors that provides the PCM a signal for each of the various positions of the manual lever (PARK, REVERSE, NEUTRAL, (D), and L) to the PCM. The PCM uses the dual TR sensor signal for engine start, reverse lamps and for line pressure control, shift scheduling and TCC operation.
TSS sensor.	The TSS sensor is a Hall-effect type sensor that provides a Turbine shaft speed signal to the PCM. The TSS signal changes in frequency as the rotating speed of the trigger wheel, part of the B 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 OSS sensor 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 trigger wheel, part of the park gear, varies. The OSS is used for shift scheduling. The OSS is also compared to the TSS/ISSA (Turbine Shaft Speed/Intermediate Shaft Speed Assembly) to determine shift quality and clutch performance.
Transmission fluid pressure sensor	The transmission fluid pressure sensor for clutch A and clutch B have been added to improve diagnostic capability for non-electrical (stuck solenoid or valve) faults. The transmission fluid pressure sensor provides a voltage proportional to the absolute hydraulic pressure in a transmission clutch control circuit using a piezo-resistive silicon sensing element. Pressure readings are used to monitor the status of specified clutch systems during operation. The transmission pressure sensor is mounted on the transmission main control assembly with a dedicated feed port.
Intermediate speed sensor	The Intermediate speed sensor is a Hall-effect type sensor that provides a reaction carrier speed signal to the PCM. The Intermediate speed sensor signal changes in frequency as the rotating speed of the electronic Selectable One-Way Clutch (SOWC) inner race varies. The Intermediate speed sensor information is compared to engine rpm to determine Intermediate speed sensor performance. The Intermediate speed sensor information is also compared to the OSS to determine shift quality and clutch performance.