•  The variable intake air solenoid valve mainly consists of the solenoid coil, spring, and plunger.

•  The solenoid coil magnetizes, pulling the plunger. The passage between A and B ports opens due to the plunger being pulled, and intake manifold vacuum is applied to the actuator.

•  The intake manifold vacuum passage is blocked, and the passage between ports B and C opens, depressurizing the actuator.