![]() ![]() Specially designed grooves (or a notched reluctor wheel) are permanently attached to the transmission main (or input) shaft. It is normally positioned near the rear of the bell housing (at the transmission input shaft) The sensor is usually mounted with a bolt/stud or threaded directly into the transmission case. ![]() The input/turbine speed sensor is typically a 3-wire, electromagnetic sensor that is used to monitor transmission input speed (identified by the PCM as revolutions per minute or RPMs). Input and turbine speed sensors are virtually identical in design, and serve the same purpose, but manufacturers use variations in terminology to describe them. When I run across a trouble code P0717, it is because the powertrain control module (PCM) has detected no voltage output from the circuit of the input (or turbine) speed sensor that has been given the designation A. Although generic, the specific repair steps may vary depending on make/model. This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to all 1996-newer vehicles (Ford, Honda, Mazda, Mercedes, VW, etc.). The control solenoid (w/body and TCM) valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, Torque Converter Clutch (TCC) slip speed and gear ratio.Input/Turbine Speed Sensor A Circuit No Signal This signal is transmitted through the ISS signal circuit to the control solenoid (w/body and TCM) valve assembly. As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the machined surface of the 1-2-3-4 and 3-5-R clutch housing. The sensor receives 8.3-9.3 volts on the Input/Output Speed Sensor (ISS/OSS) supply voltage circuit from the Transmission Control Module (TCM). The sensor faces the 1-2-3-4 and 3-5-R clutch housing machined teeth surface. The ISS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and TCM) valve assembly through a wire harness and connector. ![]() The Input Speed Sensor (ISS) is a hall-effect type sensor. ![]()
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