Engine Speed Sensor: Description
WARNING: This page is about a different car, the 2005 Dodge Grand Caravan, 2005 Dodge Caravan, and 2005 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
The PCM receives a signal from the TCM to indicate vehicle speed on automatic transmission cars. On 4 cylinder Manual transmission cars (if equipped) vehicle, a dedicated vehicle speed sensor is connected to the PCM. On V-6 Manual transmission cars (if equipped) vehicle, the ABS module provides the signal to the PCM for vehicle speed.