EGR Electronic Vacuum Regulator Solenoid: Description and Operation

EGR Vacuum Regulator (EVR) Solenoid:

The EGR Vacuum Regulator (EVR) solenoid allows the Powertrain Control Module (PCM) to modulate the EGR valve opening to any degree. An electric current in the coil induces a magnetic field in the armature that pulls on a disk closing the vent to atmosphere. The PCM outputs a duty cycle to the EVR solenoid that regulates the vacuum level to the Exhaust Gas Recirculation (EGR) valve. The vacuum source is manifold vacuum.