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Servicing Motronic injection system
Safety precautions
Note the following points if testers and measuring instruments have to be used during a road test:
Important:
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◆ Always attach testers and measuring instruments to the back seat and have a second person operate them from there.
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◆ If test equipment were operated from the front passenger seat, the person sitting there could be injured if the front passenger airbag were triggered in the event of an accident.
To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted:
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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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◆ To run engine at starting speed without actually starting it (for example, in order to test compression), unplug connector from the output stage of the ignition coils and also the connectors on the injectors.
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◆ In the case of some tests, a fault may be recognised and stored by the control unit. At the end of all tests and repairs, therefore, the fault memory should be interrogated and, if necessary, erased. After erasing the fault memory the readiness code must be renewed .
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◆ Always switch off the ignition before washing 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.
Important:
The fuel system is pressurised! Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.
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