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 hoses not clogged or kinked
- Pressure and intake hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked.
- Ignition switched off.

Test sequence







- 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).

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







- Disconnect pressure hose (arrow) from Secondary Air Injection (AIR) Pump Motor - V101- at pressure line.
- Attach assisting hose onto pressure line and blow into with light pressure.
Combination valve must close.
- 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), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code