Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Hand vacuum pump V.A.G 1390

Test sequence

• ‒ → Pull vacuum hose -1- off secondary air inlet valve -2- (N112).
• ‒ Connect hand vacuum pump V.A.G 1390 to vacuum hose -1-.
  

• ‒ → Pull pressure hose -arrow- off non-return valve.

Note:

Do not use compressed air during the following check!

• ‒ Connect aux. hose to non-return valve and blow into it.
       Valve must be closed.
• ‒ Operate hand vacuum pump.
       Combi valve must open.