| General notes on self-diagnosis |
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| The engine control unit has a self-diagnosis capability. Before carrying out repairs and for fault finding, first read event memory. Also the vacuum hoses and connections must be checked (unmetered air). |
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| Fuel hoses in engine compartment must be secured only with spring-type clips. The use of clamp or screw-type clips is not permissible. |
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| A voltage of at least 11.5 V is required for proper operation of the electrical components. |
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| Do not use sealants containing silicone. Particles of silicone drawn into the engine will not be burnt in the engine and damage the Lambda probe. |
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| Vehicles are fitted with a crash fuel shut-off circuit. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay. |
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| The system also improves the starting characteristics of the engine. When the driver's door is opened, the fuel pump is activated for 2 seconds in order to build up pressure in the fuel system → Chapter. |
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