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1.5 Safety precautions when working on the
injection system
To prevent injuries to persons and/or damage to the fuel injection
and ignition system, note the following:
♦ Persons wearing a cardiac pacemaker must at all times main‐
tain a safe distance from high-voltage components such as the
ignition system and xenon headlights.
♦ Always switch off the ignition before connecting or discon‐
necting electrical wiring for the injection or ignition system or
tester cables.
♦ For safety reasons, the battery must be disconnected before
opening the fuel system to prevent the fuel pump from being
activated by the contact switch on the driver's door.
♦ Do not open any fuel line connections while the engine is run‐
ning.
♦ Always switch off ignition before washing engine.
♦ If you want to crank the engine at starting speed without ac‐
tually starting the engine (e.g. compression test), first unplug
the electrical connectors from the ignition coils ⇒ page 53 .
♦ Also remove fuse for fuel pump control unit -J538- ⇒ Current
flow diagrams, Electrical fault finding and Fitting locations.
♦ Entries will be stored in the event memory of the engine control
unit if electrical connectors have been unplugged and the en‐
gine started.
Caution
To prevent irreparable damage to the electronic components
when disconnecting the battery:
♦ Observe notes on procedure for disconnecting the battery.
♦ Always switch off the ignition before disconnecting the
battery.
– Disconnect battery ⇒ Electrical system; Rep. gr. 27 .
1.6 Reducing pressure in high-pressure
section of injection system
WARNING
The fuel system operates at extremely high pressure. This can
cause injury.
♦ The injection system consists of a high-pressure section
(maximum approx. 120 bar) and a low-pressure section
(approx. 7 bar).
♦ The fuel pressure in the high-pressure section must be
reduced to a residual pressure of approx. 7 bar prior to
opening the system. The procedure is described below.
Special tools and workshop equipment required
♦ ⇒ Vehicle diagnostic tester
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
1. Safety precautions and rules for cleanliness 3
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