Air Injection Control Valve: Testing and Inspection

Combination Valve For Secondary Air Injection (AIR), Checking Function And Proper Seal

Special Tools and Equipment







- VAG1390

Test requirements:
- Vacuum lines and hose connections leak-free.
- Vacuum lines not clogged.

Test sequence







- Remove rear engine cover (arrows).







- Remove bolts for holding plate for solenoid valves (arrows).
- Lift up holding plate and disconnect vacuum hose from Y-piece of combination valve to be checked.
- Connect VAG1390 hand vacuum pump to vacuum hose of combination valve to be checked.







- For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of parking heater/auxiliary heater at noise insulation.







- Loosen mounting parts -1 to 4- and remove noise insulation.







- Disconnect pressure hose -1- at Secondary Air Injection (AIR) Pump Motor and blow into it with light pressure (do not use pressurized air).
- Both combination valves must be closed, it must not be possible to blow through hose
- Operate hand vacuum pump.
- The relevant combination valve must open, it must not be possible to blow through

If the relevant combination valve does not open:
- Replace combination valve.