Passat Sedan V6-2792cc 2.8L DOHC (AAA) SFI (1997)
Air Injection Check Valve: Testing and Inspection
CHECKING SECONDARY AIR INJECTION INLET VALVE
CAUTION: Do not use compressed air during this check.
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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.
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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.