Input Speed Sensor (A/T)
The input speed sensor is a two-wire magnetic pick-up device that generates an AC voltage signal as rotation occurs. It is threaded into the transaxle case and sealed with an "O" ring. See Fig 1 . The sensor is considered a primary input to the Powertrain Control Module (PCM). The input speed sensor provides information on how fast the input shaft is rotating. As the teeth of the input clutch hub pass by the sensor coil, an AC voltage signal is generated and sent to the PCM. The PCM interprets this information as input shaft RPM. The PCM compares the input speed signal with the output speed signal to determine transmission gear ratio, speed ratio error detection and clutch volume index. The PCM also compares the input speed signal and the engine speed signal to determine torque converter clutch slippage and torque converter element speed ratio.