#
VARIABLE AIR DUCT (VAD) SYSTEM OUTLINE [L3]

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## Outline

• The VAD control system opens the VAD shutter valve in the air cleaner only at high engine speeds so that engine performance does not decrease at high engine speeds due to insufficient mass airflow amount.

## Structure

• The VAD system is composed of VAD shutter valve, VAD solenoid valve, VAD vacuum chamber, and VAD check valve (one-way).

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1 | VAD vacuum chamber
2 | VAD shutter valve
3 | VAD solenoid valve
4 | VAD check valve (one-way)