Input Speed Sensor
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
Input speed sensor uses a magnetic pick-up coil to generate an AC voltage input signal when trigger teeth on input clutch assembly pass magnetic pick-up coil. See Figure. PCM uses input signal to determine input shaft speed.