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Check fuel pressure with pressure gaugeV.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, Electrical fault finding 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:
For the vehicles Fabia II
–  Position right rear seat vertically → Body Work; Rep. gr.72.
For the vehicles Roomster
–  Fold back the middle and rear seat and position vertically → Body Work; Rep. gr.72.
For the vehicles Octavia II
–  Removing rear seat bench → Body Work; Rep. gr.72.
For the vehicles Yeti
–  Remove rear seat bench with brackets → Body Work; Rep. gr.72.
–  Remove floor covering under the rear seat bench.
For the vehicles Fabia II, Roomster
   
–  Disconnect plug from fuel pump control unit -J538--2-.
For the vehicles Octavia II, Yeti
  N20-0603
–  Disconnect plug -3- from fuel pump control unit -J538-.
Continued for all vehicles
  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.
The LED does not light up:
–  Determine and remove open circuit in the wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.
The LED lights up (power supply O.°K.):
–  Remove fuel delivery unit:
t  Fabia II, Roomster → Chapter.
t  Octavia II, Yeti (version l.) → Chapter.
t  Yeti (version II.) → Chapter.
–  Check whether the electric wiring between the flange and fuel pump is connected.
If there is no open circuit in the wiring:
–  Fuel pump defective, replace the fuel delivery unit:
t  Fabia II, Roomster → Chapter.
t  Octavia II, Yeti (version l.) → Chapter.
t  Yeti (version II.) → Chapter.
  N20-0617

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