Air Injection Control Valve: Testing and Inspection

Combination valve for secondary air system, checking function, checking for leaks

Special tools and equipment





^ V.A.G 1390 Hand vacuum pump

Requirements for test:
^ No leaks in vacuum hoses and hose connections
^ No obstructions in vacuum hoses

Test sequence
- Remove air filter housing.





- Detach vacuum hose (arrow) from combination valve which is to be tested.
- Connect hand vacuum pump VAG 1390 to vacuum hose for relevant combination valve.

Note:
^ Illustration shows engine from rear.
^ Illustration shows left combination valve.





- Disconnect pressure hose -2- at secondary air pump motor and blow into hose lightly (do not use compressed air).
^ Both combination valves should be closed; it should not be possible to blow through hose.

- Operate hand vacuum pump.
^ The relevant combination valve should open; it should now be possible to blow through hose.

If relevant combination valve does not open:
- Replace combination valve.
- Install air filter housing.