EGR Electronic Vacuum Regulator Solenoid: Description and Operation

EGR Vacuum Regulator (EVR) Solenoid:

The EGR Vacuum Regulator (EVR) solenoid allows the Electronic Control Assembly (ECA) to modulate the EGR valve opening, by controlling the ground circuit.
When the ECA grounds the EVR circuit, a magnetic field produced from the energized coil lifts the metal disk, opening the vacuum passage. Engine vacuum is now applied to the EGR valve and the valve opens. The ECA cycles the EVR ON and OFF rapidly in order to control EGR valve opening.