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Procedure before opening high-pressure section of injection system > < Engine data
Safety precautions
Safety precautions
When working on the fuel system note the following warnings:
  WARNING
The fuel system operates at extremely high pressure. This can cause injury.
The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system.
–  Procedure before opening high-pressure section of injection system → Rep. Gr.24.
Observe the following to prevent injuries to persons and damage to the injection and ignition system:
t  Always switch off the ignition before connecting or disconnecting electrical wiring for the injection or ignition system or tester cables.
t  Always switch off ignition before washing engine.
t  Faults are stored in engine control units if electrical connectors were unplugged and engine was started: “Generate readiness code” in “Guided Functions” → Vehicle diagnosis, testing and information system VAS 5051.
  Caution
To prevent damage to the electronic components when disconnecting the battery:
t  Observe notes on procedure for disconnecting the battery.
t  Always switch off the ignition before disconnecting the battery.
–  Disconnect battery → Rep. Gr.27.
When working on the cooling system note the following warnings:
  WARNING
Hot steam/hot coolant can escape - risk of scalding.
t  The cooling system is under pressure when the engine is hot.
t  To allow pressure to dissipate, cover filler cap on expansion tank with cloth and open carefully.
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.
l  The use of test equipment while driving causes distraction.
l  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.
   

Procedure before opening high-pressure section of injection system > < Engine data