| Air is blown from the secondary air system behind the exhaust valves for 65 seconds during a cold start (+15 °C…+35 °C coolant temperature). This produces an oxygen rich exhaust gas, causing afterburning and reducing the heat-up phase of the catalytic converter. The activation is initiated by the engine control unit via the secondary air pump relay -J299- to combination valve. The combi-valve opens automatically. Additionally, after each subsequent engine start (up to max. 80 C engine temperature), the secondary air system will, after a 20 second delay, switch in for 5 seconds during idling and will be checked by the self-diagnosis. |
|
|
|
