With Manufacturer's Scan Tool

Combi-valve, checking

Special tools and equipment
- Hand vacuum pump V.A.G 1390

Check conditions
- Vacuum pipes and hose connections free of leaks.
- Vacuum pipes not blocked/kinked.

Test sequence





- Pull vacuum hose off Y piece -arrow- of combi-valve to be checked.






- Connect hand vacuum pump VAG 1390 to vacuum hose of valve to be checked.

Note: Do not use compressed air during the following check!

- Remove sound insulation






- Remove pressure hose -arrow between secondary air injection pump motor and connecting pipe and blow in with slight pressure.
Both combi-valves must be closed.

- Operate hand vacuum pump.
Corresponding combi-valve must open.

If the combi-valve does not open:
- Replace corresponding combi-valve. Service and Repair