Function

Secondary Air Injection (AIR) system


WARNING: Observe the following for all installations, especially in engine compartment due to lack of room:
- Route lines of all types (e.g. for fuel, hydraulic, EVAP canister system, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.
- Watch for sufficient clearance to all moving or hot components.


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 module. Activation occurs from Motronic Engine Control Module (ECM) -J220- via Secondary Air Injection (AIR) Pump Relay -J299- to Secondary Air Injection (AIR) Solenoid Valve -N112- to the 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.


Removing and installing Secondary Air Injection (AIR) system components.
Check secondary air system for proper seal.