Combination Valve For Secondary Air Injection

Combination valve for Secondary Air Injection (AIR), checking function and proper seal
Special Tools and Equipment





^ VAG1390 hand vacuum pump

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.





^ Remove bolts or release quick-release screws -1- and -2- and remove front noise insulation.





^ Disconnect pressure hose (arrow) 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 be possible to blow through
^ If the relevant combination valve does not open:
^ Replace combination valve.