Combination Valve For Secondary Air Injection (Air) System, Checking Function and For Proper Seal

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

Special tools and equipment







- VAG1390 Hand vacuum pump

Requirements
- Vacuum lines and hose connections leak-free.
- Vacuum lines not clogged.

Work 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 auxiliary heater at sound insulation.







- Remove bolts or release quick-release screws -1- and -2- and remove front sound 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.
- Relevant combination valve must open, it must be possible to blow through

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