Function and Tightness of Secondary Air Combination Valve, Checking

Function And Tightness Of Secondary Air Combination Valve, Checking

Special tools, testers and auxiliary items required







- Vacuum hand pump VAG1390

Requirements
- No leaks along vacuum hoses or at hose connections.
- No obstructions in vacuum hoses.

Work sequence







- Remove engine cover - arrows -.







- Disconnect vacuum hose - arrow - at combination valve.
- Connect vacuum hand pump VAG1390 to vacuum hose of combination valve.







- Remove sound insulation - arrows - .







- Disconnect hose - arrow - at line for secondary air combination valve.
- Connect test hose to line ...
- ... and blow into hose with slight pressure (do not use compressed air).
- Combination valve should be closed. It should not be possible to blow through hose.
- Operate vacuum hand pump.
- Combination valve should open. It should now be possible to blow through hose.

If combination valve does not open:
- Replace combination valve.