Volkswagen Workshop Service and Repair Manuals

Air Injection Control Valve: Testing and Inspection
With Manufacturer's Scan Tool

Combi-valve, checking 

Special tools and equipment 

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Hand vacuum pump V.A.G 1390

Check conditions 

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Vacuum pipes and hose connections free of leaks.

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Vacuum pipes not blocked/kinked.

Test sequence

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Pull vacuum hose off Y piece -arrow- of combi-valve to be checked.

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Connect hand vacuum pump VAG 1390 to vacuum hose of valve to be checked.

Note:

Do not use compressed air during the following check!

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Remove sound insulation

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Remove pressure hose -arrow between secondary air injection pump motor and connecting pipe and blow in with slight pressure.
Both combi-valves must be closed.