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Checking fuel pressure and residual pressure (up to high-pressure pump) > < Removing and installing fuel pressure senderG247

A3 Mk2

Checking fuel pressure senderG247
Checking fuel pressure sender -G247-
Special tools and workshop equipment required
t  Assembly tool -T10118-
t  Double hexagon socket, 27 mm -VAS 5301/7-
t  Pressure sensor tester -VAS 6394/1-
t  Adapter -VAS 6394/2-
t  Test instrument adapter -VAS 5570-
t  Torque wrench -V.A.G 1331-
t 
Procedure:
–  Remove engine cover panel → Chapter.
  WARNING
The fuel system is pressurised. The fuel pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening; for procedure see → Chapter.
–  Remove fuel pressure sender -G247- → Chapter.
   
–  Screw in adapter -VAS 6294/2- in place of fuel pressure sender -G247- and tighten adapter with the same torque as that specified for fuel pressure sender -G247-.
t  Tightening torque: fuel rail - exploded view → Chapter
  N24-10489
–  Unscrew plug -2- on pressure gauge -VAS 6394/1- and screw in the removed fuel pressure sender -G247-. Tighten to torque normally specified for fuel pressure sender.
  N24-10400
–  Use test instrument adapter -VAS 5570- to make electrical connection between vehicle and fuel pressure sender -G247-.
–  Connect a vehicle diagnostic tester.
–  Switch on ignition.
–  Select „Engine electronics“ in vehicle self-diagnosis.
–  Then select function read „Measured values“.
–  Select measured value block 140.
Display zone 3 shows the actual pressure value being transmitted to the engine control unit by the fuel pressure sender -G247-.
  N24-10488
–  Switch on pressure gauge -VAS 6394/1- by pressing button -A- once briefly.
  Note
You can press and hold button -A- for 2 seconds to switch on the illumination for 20 seconds.
Pressure gauge -VAS 6394/1- should indicate 0 bar. If this is not the case, press button -C- once briefly to zero the tester.
  N24-10457
–  Connect pressure line of pressure gauge -VAS 6394/1- to adapter -VAS 6394/2-.
–  Start engine.
–  Compare the pressure indicated by pressure gauge -VAS 6394/1- with the actual pressure value on the vehicle diagnostic tester.
l  The pressure readings must not deviate by more than 5 bar.
–  If the deviation is more than 5 bar, test a new fuel pressure sender -G247-.
  WARNING
The fuel system is pressurised. The fuel pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening; for procedure see → Chapter.
–  Screw a new fuel pressure sender -G247- into the pressure gauge -VAS 6394/1-.
–  Repeat the test with the new fuel pressure sender -G247- and compare the two pressure values.
If the two values still do not agree:
–  Check the electrical connection between the fuel pressure sender -G247- and the engine control unit; refer to → Current flow diagrams, Electrical fault finding and Fitting locations.
If the values agree:
–  Install the new fuel pressure sender -G247- → Chapter.
  N24-10488

Checking fuel pressure and residual pressure (up to high-pressure pump) > < Removing and installing fuel pressure senderG247