Transmission Sensors

Courtesy of FORD MOTOR COMPANY

Item	Description
1	Intermediate Speed A (ISSA) sensor
2	TSS sensor
3	Intermediate Speed B (ISSB) sensor
4	OSS sensor

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	The TFT sensor is located in the transmission main control valve 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 is composed of a dual set of TR sensors. The manual shifter engages and disengages Park and the shifter position is detected by reading TR sensors A and B. There is no manual valve, the PCM provides forward or reverse based on the dual TR sensor inputs. The 10R60 transmission uses a dual PWM output (at 125 Hz) TR sensors where: TR sensor A increases as the shifter is moved from Park to Sport and TR sensor B decreases as the shifter is moved from Park to Sport, together the sum of the two signals should add up to 100%. The 10R60 transmission mechanical shifter variant is range by wire with mechanical Park. The dual TR sensor's signals are used to determine customer selected range (P, R, N, D, S). PIDs, TR_A_DC and TR_B_DC may be utilized to monitor the TR sensor duty cycles.
TSS Sensor	The TSS sensor is a 2-wire Hall-effect type sensor that provides a turbine shaft speed signal to the PCM that changes in frequency as the magnetic trigger wheel part of the planetary carrier No. 2 varies in speed or direction. The turbine shaft speed information is compared to engine rpm to determine turbine shaft speed performance. Turbine shaft speed is also compared to output shaft speed to determine shift quality and clutch performance. The TSS sensor is mounted to the transmission case.
OSS Sensor	The OSS sensor is a 2-wire Hall-effect type sensor that provides a output shaft speed signal to the PCM that changes in frequency as the trigger wheel part of the output shaft and planetary carrier No. 4 varies in speed or direction. The output shaft speed is used for shift scheduling. Output shaft speed is also compared to turbine shaft speed to determine shift quality and clutch performance. The OSS sensor is mounted to the transmission case.
Intermediate Speed A (ISSA) Sensor	The intermediate speed sensor A (ISSA), is a 2-wire Hall-effect type sensor that provides an intermediate speed sensor A (ISSA) signal to the PCM that changes in frequency as the trigger wheel part of the No. 1 ring gear varies in speed or direction. The intermediate speed sensor A (ISSA) monitors clutch states for transmission fault detection and diagnostics. The intermediate speed sensor A (ISSA) is mounted to the transmission case.
Intermediate Speed B (ISSB) Sensor	The intermediate speed sensor B (ISSB), is a 2-wire Hall-effect type sensor that provides an intermediate speed sensor B (ISSB) signal to the PCM that changes in frequency as the trigger wheel part of the clutch and planetary container cylinder varies in speed or direction. The intermediate speed sensor B (ISSB) monitors clutch states for transmission fault detection and diagnostics. The intermediate speed sensor B (ISSB) is mounted to the transmission case.