A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009)
Fuel Pressure Release: Service and Repair
Before Opening High Pressure Fuel Injection System
For safety reasons, if the battery is not disconnected, fuse - 28 - from the Fuel Pump (FP) Control Module (J538 ) must be removed before opening
fuel system. Otherwise, the fuel pump will be activated by the driver's door contact switch.
‹› The fuse is located in the fuse carrier in the instrument panel.
‹› By removing fuse - 28 -, the voltage supply to " terminal 30" for the Fuel Pump (FP) Control Module ( J538) is interrupted.
CAUTION!
The fuel injection system is divided into a high pressure section (maximum approximately 110 bar) and a low pressure system
(approximately 6 bar).
Before opening high pressure parts, e.g. removing high pressure pump, fuel rail, fuel injectors, fuel pipes or Fuel Pressure Sensor (G247)
(G247), fuel pressure in high pressure area must be reduced to a residual pressure of approximately 6 bar. The procedure for this is as
follows.
High fuel pressure, reducing
Special tools, testers and auxiliary items required
‹› Assembly tool (T10118)
-
Remove electrical connector - 2 - from Fuel Pressure Regulator Valve (N276) using the Assembly Tool (T10118).
-
Allow engine to idle approximately 10 seconds.