Variable Air Duct (Vad) Shutter Valve Description (L3 - Mazda 6 Training Manual

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1 VAD shutter valve
2 VAD control solenoid valve
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VARIABLE AIR DUCT (VAD) SHUTTER VALVE DESCRIPTION (L3)

Function
• Opens and closes the shutter valves.
Structure
• The VAD shutter valve actuator is composed of a rod, diaphragm chamber, and spring.
Operation
• Normally, the rod is pushed by the force of the spring, opening the shutter valve. When intake manifold vacuum
is applied to the diaphragm chamber, the rod is pulled, closing the shutter valve.
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1 Shutter valve open
2 Shutter valve close
3 VAD shutter valve actuator
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INTAKE-AIR SYSTEM
3 VAD vacuum chamber
4 VAD check valve (one-way)
4 Rod
5 VAD shutter valve
6 Intake manifold vacuum
F
A6E3910W029
A6E391013000T04
A6E3910W027
F–15