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Procedure before opening high-pressure section of injection system > < Safety precautions

A4 Mk2

Working on the fuel system
Working on the fuel system
When working on the fuel system note the following warnings:
  WARNING
The fuel system operates at extremely high pressure. This can cause injury.
t  The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system.
t  Wrap a clean cloth around the connection and carefully loosen the connection to allow the residual pressure to dissipate.
–  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 diagnostic tester.
  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.
   

Procedure before opening high-pressure section of injection system > < Safety precautions