WARNING | The fuel system is under pressure! Place a cloth around the connecting points before releasing the hose connection or when opening the test connection (to fuel pressure measurement). Then reduce the pressure by carefully removing the hose or cap. |
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| Observe the following points to prevent injury to persons and/or damage to the injection and ignition system: |
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| Do not touch or remove ignition leads with the engine running or at start speed. |
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| Disconnect and connect the cables of the fuel injection and ignition system only when the ignition is switched off. This also applies for the cables of the measuring devices. |
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| To operate the engine at start speed without the engine starting (e.g. testing compression pressure), pull out the plug from the power output stage of the ignition coils. After performing the work interrogate fault memory and erase → Chapter. |
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| Do not carry out engine wash unless the ignition is switched off. |
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| Switch off the ignition before disconnecting and connecting the battery, as this may damage the 4AV control unit. |
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