Audi A8 2010 Workshop Manual page 39

Simos direct petrol injection and ignition system (6-cyl. 3.0 ltr. TFSI 4-valve) - Edition 12.2011
– Connect K-Jetronic pressure tester -V.A.G 1318- to fuel sup‐
ply hose with adapters -V.A.G 1318/11- and -V.A.G 1318/15- .
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– Close cut-off valve on K-Jetronic pressure tester -V.A.G
1318- .
• Lever is at right angle to direction of flow -arrow-.
– Connect a vehicle diagnostic tester.
– Select „Engine electronics" in vehicle self-diagnosis.
– Then select „Final control diagnosis".
– Select „Fuel pump electronics" from list and press „start".
Note
This function activates the fuel pump.
– Read off fuel pressure on K-Jetronic pressure tester -V.A.G
1318- .
• Specification: 5 to 8 bar
– End this function when fuel pressure stops rising on K-Jetronic
pressure tester -V.A.G 1318- .
– If specification is not attained, check delivery rate of fuel pump
⇒ Rep. gr. 20 .
Checking residual pressure
– Check system for leaks and check residual pressure by watch‐
ing the drop in pressure on the K-Jetronic pressure tester -
V.A.G 1318- .
• After 10 minutes pressure should still be at least 3.0 bar.
If the residual pressure drops below 3.0 bar:
♦ Check union between pressure tester and fuel line for leaks.
♦ Check pressure tester for leaks.
♦ Check fuel lines and their connections for leaks.
♦ Renew fuel filter with integral fuel pressure regulator ⇒ Rep.
gr. 20 .
♦ Renew fuel pump ⇒ Rep. gr. 20 .
Assembling
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Audi A8 2010 ➤
35
2. Injection system