Combination Valve, Checking

Combination Valve, Checking

The following procedure is used to test all combination valves.

Special tools, testers and auxiliary items required

• Hand vacuum pump.

Test conditions

• Vacuum lines and hose connections free of leaks.

• Vacuum lines not plugged.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check.

Start procedure

- Remove the vacuum hose from the combination valve.

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





- Remove the air duct hose - arrow - from the Throttle Valve Control Module (J338) and position aside.





- Disconnect the Secondary Air Injection hose - arrow -.





- Inject a light air pressure into the in Secondary Air Injection hose to close the combination valve. (do not use compressed air).

The combination valve should close and seal. Air should not be able to pass through the combination valve.

- Operate the hand vacuum pump.



The combination valve should open. Air should be able to pass through the combination valve.

If combination valve does not open:

- Replace the faulty combination valve.

End of Procedure.