Air Injection Check Valve: Testing and Inspection

CHECKING SECONDARY AIR INJECTION INLET VALVE

CAUTION: Do not use compressed air during this check.

- Disconnect pressure hose from AIR Inlet Valve.
- Disconnect vacuum hose from AIR Solenoid Valve (N112).



- Connect VAG 1390 hand vacuum pump to disconnected vacuum hose -1- and AIR Inlet Valve.
- Connect auxiliary hose to connection -2-, in place of pressure hose, and blow into it.

^ AIR Inlet Valve must be closed.

- Operate hand vacuum pump.

^ AIR Inlet Valve must open.