With Manufacturer's Scan Tool

Function And Tightness Of Secondary Air Combination Valve, Checking

Special tools and equipment







- Vacuum hand pump VAG 1390

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 VAG 1390 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.