General notes on self-diagnosis |
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| The engine control unit has a fault memory. |
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| Before carrying out any repairs or Fault Finding, the fault memory must be interrogated. |
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| The vacuum hoses and connections must be checked (to prevent unmetered air). |
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| Fuel hoses in engine compartment must only be secured with spring-type clips. O-type clips or screw-type clips must not be used. |
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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 will damage the Lambda probe. |
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| The vehicles are fitted with a crash/fuel shut-off system. This function is designed to reduce the risk of a vehicle fire after a crash by deactivating the fuel pump via the fuel pump relay. |
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| At the same time, this system also improves the engine's starting performance. When the driver's door is opened, the fuel pump is activated for approx. 2 seconds in order to build up pressure in the fuel system; observe safety precautions → Chapter. |
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