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Reducing pressure in high-pressure section of injection system > < Rules for cleanliness and instructions for working on fuel system
Safety precautions when working on the ignition system
Safety precautions when working on the ignition system
To prevent injuries to persons and/or irreparable damage to the fuel injection and ignition system, the following must be noted:
t  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.
t  Do not open any fuel line connections while the engine is running.
t  Always switch off the ignition before connecting or disconnecting injection or ignition system wiring or tester cables.
t  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.
t  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.
t  If the event memory has been erased, you must generate the readiness code again.
t  Always switch off the ignition before cleaning the engine.
   
t  If the engine has to be operated at the starting speed without actually starting (e.g. to test compression pressure), detach the four connectors from the ignition coils using assembly tool -T40039- → Chapter. Also remove fuse for fuel pump control unit -J538-.
  Note
t  The fuse is located in the fuse holder in the dash panel.
t  Removing the fuse (located in fuse carrier in dash panel on driver's side) will interrupt the power supply from »terminal 30« for the fuel pump control unit -J538-. → Current flow diagrams, Electrical fault finding and Fitting locations
  A97-10558

Reducing pressure in high-pressure section of injection system > < Rules for cleanliness and instructions for working on fuel system