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1.3 Safety precautions when working on ve‐
hicles with start/stop system
WARNING
Risk of injury due to automatic engine start on vehicles with
start/stop system.
♦ On vehicles with activated start/stop system (this is indi‐
cated by a message in the instrument cluster display), the
engine may start automatically on demand.
♦ Therefore it is important to ensure that the start/stop sys‐
tem is deactivated when performing repairs (switch off
ignition, if required switch on ignition again).
1.4 Safety precautions when working on the
fuel system
WARNING
♦ If the battery is not disconnected, the fuse for the fuel
pump control unit -J538- must be removed as a precau‐
tionary measure before opening the fuel system because
the fuel pump will otherwise be activated by the contact
switch on the driver's door.
♦ The fuel system is pressurised. The fuel pressure in the
high-pressure section of the injection system must be re‐
duced to a residual pressure prior to opening; for proce‐
dure see ⇒ page 3 .
♦ The connection must be opened immediately after reduc‐
ing the pressure; wrap a cloth around the connection and
allow the residual pressure (approx. 7 bar) to dissipate.
Even small amounts of dirt can cause malfunctions. When work‐
ing on the fuel supply system and injection system, pay careful
attention to the following basic rules:
♦ Carefully clean connection points and the surrounding area
with engine cleaner or brake cleaner and dry thoroughly before
opening.
♦ Seal off open lines and connections with clean plugs.
♦ Place parts that have been removed on a clean surface and
cover them over. Do not use fluffy cloths.
♦ Carefully cover or seal open components if repairs cannot be
carried out immediately.
♦ Only install clean components; replacement parts should only
be unpacked immediately prior to installation. Do not use parts
that have been previously unpacked and stored away loose
(e.g. in toolboxes, etc.).
♦ When the system is open: Do not work with compressed air.
Do not move the vehicle unless absolutely necessary.
♦ Protect unplugged electrical connectors against dirt and mois‐
ture and make sure connections are dry when attaching.
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
2 Rep. gr.24 - Mixture preparation - injection
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