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

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

Recommended special tools and equipment







- VAG1390 Hand Vacuum Pump

Test requirements:
- No leaks in vacuum lines or hose connections.
- Vacuum lines not clogged.

Test sequence







- Remove engine cover (arrows).







- Disconnect vacuum hose (arrow) at combination valve.
- Connect hand vacuum pump, e.g. V.A.G 1390, to vacuum hose of combination valve.







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







- Disconnect hose (arrow) at tube to combination valve for Secondary Air Injection (AIR) system.
- Connect assisting hose to tube and blow into tube with light pressure (do not use compressed air).
- Combination valve must be closed, it must not be possible to blow through hose

- Operate hand vacuum pump.
- Combination valve must open, it must be possible to blow through

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

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory.
2. If necessary, erase DTC memory.
3. Generate readiness code. With Generic Scan Tool

- End diagnosis and switch ignition off.