•  The intake shutter solenoid valve switches the opening/closing of the passage where the vacuum generated in the vacuum pump is led to the diaphragm of the intake shutter valve actuator.

•  The intake shutter valve consists mainly of a solenoid coil, and a spring, a plunger.

•  The vacuum passage between the intake shutter valve actuator and the vacuum pump is opened or closed depending upon whether the intake shutter solenoid valve is energized or de-energized.