A3 Quattro L4-2.0L Turbo (CBFA) (2009)
Fuel Pressure Release: Service and Repair
Before Opening High Pressure Fuel Injection System
CAUTION!
The fuel injection system is divided into a high pressure section (maximum approximately 150 bar) and a low pressure system
(approximately 7 bar).
Before opening high pressure parts, e.g. removing high pressure pump, fuel rail, fuel injectors, fuel lines or fuel pressure sensor (G247),
fuel pressure in high pressure area must be reduced to a residual pressure of approximately 7 bar. The procedure for this is as follows.
High Fuel Pressure, Reducing
-
Connect vehicle diagnosis, testing and information system (VAS 5051B).
-
Start engine and run at idle speed.
-
Select "engine electronics" in OBD.
-
Then select "Measured values" read out.
-
Select measured value block 140.
-
With engine running in idle, the fuel pressure will be displayed in display field 3.
‹› Specified value: between 35 and 45 bar
-
Pry off left cover on instrument panel using special hook (3370)- arrow -.
-
With engine at idle, pull fuse - SC 27 - in the fuse holder in driver side instrument panel from fuel pump control module (J538).