Pic. 2.57. Mazda 3 VAD system with L3 engine: 1 - damper of the VAD system; 2 - control solenoid valve of the VAD system; 3 – vacuum chamber of the VAD system; 4 - check valve of the VAD system
The VAD control system opens the damper in the air filter housing at high engine speeds to increase airflow. The system consists of a damper, a control solenoid valve, a vacuum chamber and a check valve. Usually, the rod under the action of the spring opens the damper (pic. 2.57).