•  Vent side solenoid valve is connected to the EGR valve diaphragm through EGR control solenoid valve, and the vacuum side solenoid valve is connected to vacuum pump.

•  Solenoid valve consists of a solenoid coil, spring, plunger and air filter.

•  Vacuum side solenoid valve increases the angle of the valve opening by increasing vacuum on EGR valve via the EGR control signal (duty signal).

•  Vent side solenoid valve decreases the angle of the valve opening by releasing vacuum on EGR valve via the EGR control signal (duty signal).

•  Based on the combination of the vent side and vacuum side solenoid valves, the EGR valve opening angle is controlled.