volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Air Injection Pump > < Air Injection Check Valve|Locations|Page 2866
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Air Injection Control Valve: Testing and Inspection

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Disconnect pressure hose from AIR Inlet Valve.

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Disconnect vacuum hose from AIR Solenoid Valve (N112).

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Connect VAG 1390 hand vacuum pump to disconnected vacuum hose -1- and AIR Inlet Valve.

CAUTION!:  Do not use compressed air during this check.

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Connect auxiliary hose to connection -2-, in place of pressure hose, and blow into it.
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AIR Inlet Valve must be closed

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Operate hand vacuum pump.
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AIR Inlet Valve must open

Air Injection Pump > < Air Injection Check Valve|Locations|Page 2866