Combination Valve, Checking

Combination valve, checking

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 or kinked
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked

Test sequence

Note: Do not use compressed air for the following test!

- Remove front noise insulation.






- Disconnect vacuum hose -1- from Secondary Air Injection (AIR) solenoid valve (N112) -2-.
- Connect hand vacuum pump (V.A.G 1390) to vacuum hose -1- to combination valve
- Disconnect pressure hose at Secondary Air Injection (AIR) pump motor (arrow) and blow into it with light pressure.
Combination valve must close.

Note: To disengage, compress the buttons at the hose coupling.

- Operate vacuum pump.
Combination valve must open.

If the combination valve does not open or it is constantly open:
- Replace combination valve.

- Erase DTC memory of Engine Control Module (ECM).
- Generate readiness code.