Receiving ECM signal, linear solenoid type electronic EGR actuator operates Electric EGR control valve directly.ECM performs EGR system feed back control with the information of measured mass air flow (The role of MAFS in diesel engine is different from gasoline engine.

Fuel injection quantity is decided by MAFS signal in gasoline engine.)When EGR gas(contains no oxygen) flowing into combustion chamber increases, the air passing through AFS(contains oxygen) decreases. Thus, with the output signal change of AFS accompanied by Electric EGR control valve actuation, ECM determine the amount of recirculated EGR gas quantity.