Secondary Air Injection (AIR) system: Function

Air is blown behind the exhaust valves by the Secondary Air Injection (AIR) system during a cold start. This produces an oxygen rich exhaust gas, causes afterburning and reduces the heating-up phase of the catalytic converter. 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 (change-over valve) to the combination valve.

Secondary Air Injection (AIR) system overview plan → Secondary Air Injection (AIR) System, overview plan .

Checking Secondary air injection system for leaks → Secondary air injection system, checking for leaks .