Engine Speed Sensor
WARNING: This page is about a different car, the 2003 Dodge Intrepid, 2003 Chrysler Intrepid, 2003 Chrysler Concorde, and 2003 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
The PCM receives a signal from the Transmission Control Module (TCM) and the transaxle output speed sensor over the bus communication line to indicate vehicle speed. The TCM supplies the road speed and distance traveled inputs to the PCM. From these inputs and the throttle position sensor input, the PCM determines when a deceleration condition occurs.