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Servicing Motronic injection system
Safety precautions
Warning!
The fuel system is pressurized! Before loosening hose connections or opening the test connection, place a cloth around the connection. Then carefully pull hose off or remove the plug.
To prevent injuries to persons and/or damage to the fuel injection and ignition system, the following must be noted:
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◆ Do not touch or disconnect ignition wiring when the engine is running or being turned at starter speed.
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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 operate the engine at starting speed without actually starting it (for example, in order to test compression), unplug the connector from the power output stage for the ignition coils and also the plug connectors on the injectors. After completing the work, interrogate the fault memory.
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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.
Observe following if test and measuring instruments are required during a test drive:
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