When the engine is running in the low to medium speed range, the air intake control valve closes one chamber of the air filter inlet.
Pic. 2.217. Diagram of air intake control system: 1 - air intake control valve; 2 – VSV valve; 3 - actuator
When the engine is running in the high speed range, the control system opens both chambers of the air filter inlet pipe using the air intake control valve.
Pic. 2.218. Schematic diagram of the air intake control system: 1 – VSV valve; 2 – vacuum chamber; 3 - air intake control valve