EGR Valve Position Sensor: Description and Operation

EGR valve position sensor:

The EGR Valve Position (EVP) sensor returns a voltage signal to the Powertrain Control Module (PCM) indicating whether the valve is opened, closed, or somewhere in between. The voltage signal is in direct relation with the valves movement. The sensor is a linear potentiometer mounted on top of the EGR valve.

NOTE: EGR closed position is very important. Timing is retarded if EGR flow is low.