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Using testers and measuring instruments during a road test > < Safety precautions

A4 Mk3

Working on the fuel system
Working on the fuel system
When working on the fuel system note the following warnings:
  WARNING
Risk of injury - fuel system operates under pressure.
t  Wrap a cloth around the connection before opening the fuel system. Then release pressure by carefully loosening the connection.
t  If the battery is not disconnected, the fuse for the fuel pump control unit -J538- must be removed as a precautionary measure before opening the fuel system because the fuel pump will otherwise be activated by the contact switch on the driver's door.
t  Wear protective gloves.
t  Wear safety goggles.
The fuel can become extremely hot. This can cause injuries.
t  In extreme cases the temperature of the fuel lines and the fuel can be up to 100 °C after the engine is switched off. Allow the fuel to cool down before disconnecting the lines - danger of scalding.
t  Wear protective gloves.
t  Wear safety goggles.
Observe the following points to prevent personal injuries and damage to the injection and glow plug system:
t  Always switch off the ignition before connecting or disconnecting tester cables or electrical wiring for the injection or glow plug system.
t  Always switch off ignition before washing engine.
t  Entries are stored in event memory of engine control unit(s) if electrical connectors were unplugged and engine was started: Interrogate event memory in Guided Functions → Vehicle diagnostic tester.
  Caution
To prevent irreparable 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 → Electrical system; Rep. gr.27.
   

Using testers and measuring instruments during a road test > < Safety precautions