Combination Valve For Secondary Air System, Checking For Proper Operation and Leakage

Combination Valve For Secondary Air System, Checking For Proper Operation And Leakage

Special tools and equipment required







- Hand operated vacuum pump V.A.G 1390

Requirements
- Vacuum hoses and hose connections do not leak
- Vacuum hoses are not clogged

Work sequence







- Move electrical wire (arrow) clear.
- Loosen hose clips -1- and -2- and remove air hose between air cleaner housing and Throttle valve control module -J338-.
- Disconnect vacuum hose at combination valve.







- Connect hand vacuum pump V.A.G 1390 to vacuum connection of combination valve.







- Disconnect secondary air hose at position marked with an arrow.
- Blow gently into hose for combination valve (do not use compressed air).
- Combination valve must be closed; blowing through must not be possible
- Operate hand vacuum pump.
- Combination valve should open; it should now be possible to blow through hose

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