Combination Valve, Checking

Combination Valve, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAG1390)

Work procedure

• Vacuum lines and hose connections free of leaks.

• Vacuum lines not plugged.

- Pull rear engine cover off - arrows -.





- Remove solenoid valve retaining plate - arrows -.





- Lift up retaining plate and disconnect vacuum hose of combination valve to be checked from Y-piece.

- Connect Hand Vacuum Pump (VAG1390) to vacuum hose of combination valve to be checked.

- For vehicles with auxiliary heater, remove bolts - arrows - for exhaust pipe of parking heater/auxiliary heater on noise insulation.





- Loosen screws or quick-release fasteners - 1 - and - 2 - and remove front noise insulation.





- Remove quick-release fasteners - 3 - and remove rear noise insulation, if installed.

- Remove pressure hose - arrow - from Secondary Air Injection (AIR) pump.





- Blow into pressure hose using light pressure (do not use pressurized air).

• Both combination valves must be closed, it must not be possible to blow through hose.

- Operate the hand vacuum pump.

• The relevant combination valve must open, it must be possible to blow through

If relevant combination valve does not open:

- Replace (AIR) combi-valve:

• Left valve. Refer to => [ Left Combination Valve ] Left Combination Valve.

• Right valve. Refer to => [ Right Combination Valve ] Right Combination Valve.