With Generic Scan Tool

Combination Valve, Checking

Recommended special tools and equipment
- VAG1390 Hand Vacuum Pump

Test requirements
- No leaks in vacuum lines or hose connections.
- Vacuum hoses not clogged or kinked
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked

Test sequence

Vehicles with engine code AFP

NOTE: Do not use pressurized air for the following test.

- Remove front noise insulation.
- Disconnect vacuum hose from combination valve at Secondary Air Injection (AIR) Solenoid Valve -N112-, item 5.







- Connect hand vacuum pump (VAG1390) at vacuum connection to combination valve.







- Remove intake hose to combination valve at air filter upper part (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.

Vehicles with engine code BDF

NOTE: Do not use pressurized air for the following test.
- Remove engine cover.
- Remove intake air hose between Mass Air Flow (MAF) sensor and throttle valve control module, item 16.







- Disconnect vacuum hose from Secondary Air Injection (AIR) Solenoid Valve -N112- at combination valve (arrow).







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







- Disconnect pressure hose to combination valve at coupling (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.