With Generic Scan Tool

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. Mode 3: Check DTC Memory
2. If necessary, erase DTC memory. Mode 4: Reset/Erase Diagnostic Data
3. Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.