Volkswagen Workshop Service and Repair Manuals

Air Injection Bypass Valve: Testing and Inspection

Special tools, testers and auxiliary items

 8012 Hand vacuum pump (illustration shows V.A.G 1390) 

Checking conditions:

Vacuum pipes and hose connections free of leaks.

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Vacuum lines not blocked-kinked.

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Remove sound dampening tray.

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Disconnect vacuum hose from combi-valve from Secondary Air Injection solenoid valve N112.

Connect US 8012 hand vacuum pump to combi-valve vacuum hose arrow->.

NOTE: Do not use compressed air during the following check!
 

Detach hose to combi valve at Air Cleaner upper section arrow-> and pressurize slightly by blowing into hose.

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combi-valve must be closed.

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Operate hand vacuum pump.

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combi-valve must open.

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If combi-valve does not open.

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Replace combi-valve.