Audi A8 2010 Workshop Manual

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Reducing fuel pressure in high-pressure section
– Connect a ⇒ Vehicle diagnostic tester.
– Start engine and run at idling speed.
– Select „Engine electronics“ in vehicle self-diagnosis.
– Then select „Basic setting“.
– Select „Reducing fuel pressure in fuel rail“ from the list.
– Then select „Measured values“.
– Select „Operating instructions and fuel pressure“ from the list.
– To activate basic setting, perform „Operating instructions“
function.
– Observe fuel pressure displayed on ⇒ Vehicle diagnostic test‐
er.
• Fuel pressure will drop to a specified value.
– Switch off engine with pedals depressed.
The fuel rail is still filled with fuel, however it is no longer under
high pressure.
WARNING
There is a risk of injury: avoid skin contact with fuel.
♦ The fuel lines are still filled with fuel, however the fuel is
no longer under high pressure. Wear safety goggles and
protective clothing when opening the fuel system.
♦ Before opening the high-pressure section, wrap a cloth
around the connection.
– The high-pressure system must be opened »immediately« af‐
ter reducing the fuel pressure; wrap a clean cloth around the
connection. Catch the escaping fuel.
Note
The pressure will increase again due to the effect of residual heat
if the high-pressure system is not opened immediately.
Additional steps required
– Erase event memory and generate readiness code in engine
control unit in „Guided Functions“ mode.
1.7 Checking fuel system for leaks
– Allow engine to run for several minutes at moderate rpm.
– Switch off ignition.
– Check complete fuel system for leaks.
– If leaks are found although the connections have been tight‐
ened to the correct torque, the relevant component must be
renewed.
– Road-test vehicle and accelerate with full throttle at least once.
– Then inspect high-pressure section again for leaks.
Audi A8 2010 ➤
Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
4 Rep. gr.24 - Mixture preparation - injection

Audi A8 2010 Specifications

General

Brand	Audi
Model	A8 2010
Category	Automobile
Language	English