Combi-valve, checking

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Special tools, testers and auxiliary items required

Fig 1: Hand Vacuum Pump V.A.G 1390

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Hand vacuum pump V.A.G 1390

Test conditions

There must be no malfunctions stored in DTC memory
Output diagnostic test performed
Vacuum lines and hose connections free of leaks
Vacuum lines not blocked or kinked

Test sequence

Fig 2: Connecting Hand Vacuum Pump V.A.G 1390 To Vacuum Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove vacuum hose - 1 - on Secondary Air Injection (AIR) Solenoid Valve N112 - 2 -.
Connect Hand Vacuum Pump V.A.G 1390 to vacuum hose - 1 -.

NOTE:

Do not use compressed air during following check!

Fig 3: Connecting Hand Vacuum Pump V.A.G 1390 To Vacuum Hose

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect pressure hose - 3 - at Secondary Air Injection (AIR) pump motor V101 and blow air in with light pressure - arrow -. Combination valve must be closed.

NOTE:

To disengage, compress the buttons at the hose coupling.

Operate Hand vacuum pump V.A.G 1390. Valve must open.

If combi-valve does not open:

Replace combination valve.