| To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted: |
WARNING | t
| The fuel system operates under high pressure. The pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening the system → Chapter. |
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| A clean cloth must then be wrapped around the connection and the residual pressure dissipated by carefully loosening the connection. |
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| Always switch off the ignition before connecting or disconnecting electrical wiring for the injection or ignition system or tester cables. |
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| Certain tests may lead to a fault being detected by the control unit and stored. After completing all tests and repair work therefore interrogate fault memory and erase, if necessary. If you have erased fault memory, you must then generate readiness code in engine control unit in “Guided fault finding” mode. |
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| Always switch off the ignition before cleaning the engine. |
Caution | t
| Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control unit may be damaged. |
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| Observe notes on procedure for disconnecting the battery → Rep. Gr.27. |
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| Note the following if testers and measuring instruments have to be used during a road test: |
WARNING | t
| Test equipment must always be secured on the rear seat and operated from that position by a second person. |
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| If test and measuring instruments are operated from front passenger's seat and the vehicle is involved in an accident, the person sitting in this seat could be seriously injured when the airbag is triggered. |
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