Combination Valves For Secondary Air Injection (AIR) System, Checking Function and For Proper Seal

Combination Valves For Secondary Air Injection (AIR) System, Checking Function And For Proper Seal

Recommended special tools and equipment







- V.A.G 1390 Hand Vacuum Pump

Test requirements:
- No leaks in vacuum lines or hose connections.
- Vacuum lines not clogged.

Test sequence







- Remove rear engine cover (arrows).







- Disconnect vacuum hose -arrow- at combination valve to be tested.

NOTE: Left combination valve is displayed in illustration.

- Connect V.A.G 1390 hand vacuum pump to vacuum hose of combination valve to be checked.







- Remove quick-release screws -1- and -2- and remove front noise insulation. Rear section of noise insulation remains installed.







- Disconnect pressure hose -arrow- from Secondary Air Injection (AIR) pump.
- Blow with light pressure into pipe (do not use pressurized air).
- Both combination valves must be closed, it must not be possible to blow through hose
- Operate hand vacuum pump.
- The relevant combination valve must open, it must be possible to blow through

If respective combination valve does not open:
- Replace combination valve