| Note the following if testers and measuring instruments have to be used during a road test: |
WARNING | Accidents can be caused if the driver is distracted by test equipment while road-testing, or if test equipment is not properly secured. |
| Persons sitting in the front passenger's seat could be injured if the airbag is triggered in an accident. |
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| The use of test equipment while driving causes distraction. |
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| There is an increased risk of injury if test equipment is not secured. |
| Test equipment must always be secured on the rear seat with a strap and operated from the rear seat by a second person. |
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WARNING | The fuel system is pressurised. The fuel pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening; for procedure see → Chapter. |
| The connection must be opened immediately after reducing the pressure; wrap a cloth around the connection and allow the residual pressure (approx. 7 bar) to dissipate. |
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| To prevent injuries to persons and/or irreparable damage to the fuel injection and ignition system, the following must be noted: |
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| For safety reasons, the battery must be disconnected before opening the fuel system to prevent the fuel pump from being activated by the contact switch on the driver's door. |
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| Persons wearing a cardiac pacemaker must at all times maintain a safe distance from high-voltage components such as the ignition system and gas-discharge headlights. |
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| Do not open any fuel line connections while the engine is running. |
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| Always switch off the ignition before connecting or disconnecting injection or ignition system wiring or tester cables. |
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| If engine is to be operated at cranking speed without it starting (e.g. compression test), unplug connectors from ignition coils and remove fuse for electric fuel pump. |
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| Certain tests may lead to a fault being detected by the control unit and stored. The event memory should therefore be interrogated and (if necessary) erased after completing the tests and any repair work that may be required. |
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| If the event memory has been erased, you must generate the readiness code again. |
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| Always switch off the ignition before cleaning the engine. |
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| Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control unit may be damaged. |
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