Additional Information, Functional Description

Function

Air is blown behind the exhaust valves by the Secondary Air Injection (AIR) system for a maximum of 100 seconds following cold start (coolant temperature of +5 degrees C to +33 degrees C). This produces an oxygen rich exhaust gas, causes after burning and reduces the heating-up phase of the catalytic converter. Activation is triggered by the Motronic Engine Control Module (ECM) J220 via Secondary Air Injection (AIR) Pump Relay J299 to Secondary Air Injection (AIR) Solenoid Valve N112 (change-over valve) and combination valve. Additionally after each subsequent engine start (up to max. 96 degrees C engine temperature), secondary air system will switch on for 10 seconds at idle and will be checked by On Board Diagnostics. Oxygen sensor control must be active for this.