WARNING | The fuel system is under pressure! Place cleaning cloths around the connection point before detaching hose connections. Reduce pressure by carefully releasing the connection point. |
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| Observe the following points to prevent injury to persons 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 wires of the injection and ignition system and measuring device wires only when the ignition is switched off. |
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| If the engine must be operated at starter speed, without the engine actually starting, e.g. during compression testing, remove plug connections from the spark plug power output stage and from the injectors. After performing the work interrogate fault memory. |
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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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