With Generic Scan Tool

Combination Valves 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 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 e.g. V.A.G 1390 hand vacuum pump to vacuum hose of combination valve to be checked.







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







- Disconnect pressure hose (arrow) at Secondary Air Injection (AIR) pump motor and blow air in 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.

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

- End diagnosis and switch ignition off.