Function

Function

Air is blown behind the exhaust valves by the Secondary Air Injection (AIR) system during a cold start. Thereby, the emission gas is enriched with oxygen, initiating a secondary combustion and thereby shortening the warm-up phase of the catalytic converter. Activation occurs from Motronic Engine Control Module (ECM) -J220- via Secondary Air Injection (AIR) pump relay -J299- to combination valve.

NOTE:
- Always replace seals and gaskets.
- Vacuum lines and hose connections must not have leaks.
- Vacuum hoses must not be clogged or kinked.
- For the electric components to work properly, a voltage of at least 11.5 V is required.
- Components marked with * are tested via On Board Diagnostic (OBD). Diagnostic mode 3: Check DTC memory.

Secondary Air Injection (AIR) system components, removing and installing:
- Vehicles with engine code AEG, AVH, AZG, BEV.
- Vehicles with engine code BDC, BGD.

Check secondary air system for proper seal.