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Check fuel pressure with pressure gauge V.A.G 1318 > < Testing fuel pump

Octavia Mk2

Inspecting proper operation and power supply
Inspecting proper operation and power supply
Test conditions
l  Battery voltage at least 11.5 V.
l  Fuel pump fuse O.K. → Current flow diagrams and Fitting locations.
l  Fuel pump control unit -J538- O.K.
Test sequence
  Note
The function of the fuel pump is tested with the actuator diagnosis.
–  Connect vehicle diagnosis, measurement and information system -VAS 505X-.
–  Switch on ignition.
–  On the display press consecutively the buttons for “Vehicle self-diagnosis”,“01 - Engine electronics” and “03 - Actuator diagnosis”.
–  On the display press the right arrow button up to the actuator diagnosis of the fuel pump electronics.
l  The fuel pump must now run slowly to the maximum speed.
  Note
The fuel pump runs very quietly.
–  Switch off ignition.
The fuel pump does not run:
–  Removing rear seat bench → Body Work; Rep. Gr.72.
   
–  Disconnect plug -3- from fuel pump control unit -J538-.
  S20-0159
–  Testing the voltage supply with the voltage tester -V.A.G 1527B- between contact -1- and -6-.
l  The LED must light up.
LED does not light up:
–  Determine and remove open circuit in the wiring according to the current flow diagram → Current flow diagrams and Fitting locations.
The LED lights up (power supply O.K.):
  N20-0617
–  Unclip the cover -4- with the fuel pump control unit -J538--1-.
  S20-0159
–  First of all check the plug -1- for correct fit. To do so, pull on the plug without pressing the catch.
If the plug was not correctly plugged in:
–  Repeat the functional test of the fuel pump.
If the plug was correctly plugged in:
–  Now unplug the plug -1-.
–  Check the contacts at the plug and at the fuel delivery unit for damage.
If no damage was detected:
–  Remove fuel delivery unit → Chapter.
–  Check whether the electric wiring between the flange and the fuel delivery unit is connected.
If there is no open circuit in the wiring:
–  Fuel pump defective, replace fuel delivery unit → Chapter.
  M20-0232

Check fuel pressure with pressure gauge V.A.G 1318 > < Testing fuel pump