Air Injection Control Valve: Testing and Inspection

Secondary Air Injection Combination Valve, Checking for Function and Leaks

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (V.A.G 1390)

Test Conditions

• Vacuum lines and hose connections free of leaks.

• Vacuum lines not plugged.

Test Sequence

- Open the quick-release fasteners - arrows - and remove the engine cover.





- Disconnect vacuum hose at combination valve - arrow -.





• To improve clarity, the removed engine is shown from the rear.

- Connect Hand Vacuum Pump (V.A.G 1390) to combi-valve vacuum connection.

- Loosen quick-release fasteners - 1 - and - 2 - and remove front noise insulation.





- Disconnect pressure hose - arrow - at Secondary Air Injection (AIR) Pump Motor (V101) and blow into it with light pressure (do not use pressurized air).





• Combination valve must be closed, it must not be possible to blow through.

- Use the Hand Vacuum Pump (V.A.G 1390) to create a vacuum.

• The combination valve must open, it must be possible to blow through.

If combination valve does not open:

- Replace Secondary Air Injection (AIR) combi-valve. Refer to => [ Secondary Air Injection Combination Valve ] Service and Repair.