With Generic Scan Tool

Combination Valve, Checking (Vehicles with engine code AEG)

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

Test requirements
- Vacuum lines and seals not leaking
- Vacuum lines not clogged or crimped
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked

Test procedure

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

- Remove front noise insulation.






- Disconnect vacuum hose -1- from Secondary Air Injection solenoid valve -N112 -2-.
- Connect V.A.G 1390 hand vacuum pump to vacuum hose -1-.
- 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.