Speed Sensor - Input

41TE TRANSAXLE

SPEED SENSOR - INPUT

DESCRIPTION








The Input Speed Sensor is a two-wire magnetic pickup device that generates AC signals as rotation occurs. It is threaded into the transaxle case (Fig. 309), sealed with an O-ring (Fig. 310), and is considered a primary input to the Powertrain/Transmission Control Module.

OPERATION





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 (Fig. 311), an AC voltage is generated and sent to the PCM/TCM. The PCM/TCM interprets this information as input shaft rpm.

The PCM/TCM compares the input speed signal with output speed signal to determine the:
^ Transmission gear ratio
^ Speed ratio error detection
^ CVI calculation

The PCM/TCM also compares the input speed signal and the engine speed signal to determine the:
^ Torque converter clutch slippage
^ Torque converter element speed ratio