Engine Speed Sensor: Description and Operation
ENGINE SPEED SENSORThe 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.
The Transmission Control Module (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.