| During a cold start, air is blown in behind the exhaust valve by the secondary air system. This produces an oxygen-rich exhaust gas, causing afterburning and reducing the heat-up phase of the catalytic converter. Actuation is by means of Motronic control unit -J220- via secondary air pump relay -J299- to combination valve. |
WARNING | When doing any repair work, especially in the engine compartment, pay attention to the following due to the cramped conditions: |
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| Route all types of line (e.g. for fuel, hydraulics, activated charcoal filter system, coolant, refrigerant, brake fluid and vacuum) and electrical wiring in their original positions. |
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| Ensure that there is sufficient clearance to all moving or hot components. |
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