| The secondary air system blows air in behind the exhaust valves for 65 seconds during a cold start (+15°C to +35°C coolant temperature). This produces an oxygen rich exhaust gas, causing afterburning and reducing the heat-up phase of the catalytic converter. The Motronic control unit -J220- activates the secondary air inlet valve -J299- and combination valve via the secondary air pump relay -N112-. Additionally, after each subsequent engine start (up to max. 85 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. |
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