Air Injection Control Valve: Testing and Inspection

Combination valve for secondary air system for proper operation and leakage, checking

Special tools and equipment





^ Vacuum hand pump VAG 1390

Requirements:
^ No leaks in vacuum lines and hose connections
^ Vacuum lines not clogged

Work sequence





- Remove rear engine cover (arrows).





- Disconnect vacuum hose (arrow) at combination valve to be checked.

Note: Illustration shows left combination valve.

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





- On vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of auxiliary/additional heater at noise insulation.





- Remove pressure hose (arrow) at secondary air pump.
- Blow gently into pipe (do not use compressed air).
^ Both combination valves must be closed and it must not be possible to blow through them
- Operate vacuum hand pump.
^ Corresponding combination valve must open and it must be possible to blow through it
If corresponding combination valve does not open:
- Replace combination valve.