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 adds oxygen to the exhaust, 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 Secondary Air Injection (AIR) Solenoid Valve -N112 - to the combination valve.

Check secondary air system for proper seal. See SECONDARY AIR SYSTEM, CHECKING FOR PROPER SEAL  .