EGR Valve: Description and Operation

EGR Valve And Sensor Assembly:

PURPOSE
The Exhaust Gas Recirculation (EGR) valve is designed to reintroduce exhaust gas into the combustion cycle lowering combustion temperatures and reducing the formation of Nitrous Oxide.

OPERATION
The EGR valve is controlled by the Powertrain Control Module (PCM) through a vacuum signal from the EGR Vacuum Regulator (EVR) solenoid, which activates the diaphragm. An EGR Valve Position (EVP) sensor, attached to the valve, sends an electrical signal of the EGR valve position to the PCM. The amount of flow is proportional to the pintle position.