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Inspecting the fuel pump operating pressure > < Testing fuel pump

Fabia Mk2

Testing the voltage supply of the fuel pump
Testing the voltage supply of the fuel pump
Special tools and workshop equipment required
t  Vehicle diagnosis, measurement and information system -VAS 505x-
t  Hand multimeter, e.g. -V.A.G 1526 D-
t  Adapter for measuring method/DSO (5-pin), e.g. -VAS 5565-
Test conditions
l  Battery voltage at least 12 V.
l  Fuses o.k. → Current flow diagrams, Electrical fault finding and Fitting locations.
l  All electrical consumers such as the lights and rear window heater must be switched off.
Test sequence
Vehicles Fabia II
–  Position right rear seat vertically → Body Work; Rep. gr.72.
Vehicles Roomster
–  Fold the rear seat forward and position the middle and rear seat vertically → Body Work; Rep. gr.72.
Continued for all vehicles
   
–  Remove the cover of the fuel delivery unit under the mat.
–  Switch on ignition. The fuel pump must be heard to start running.
–  Switch off ignition.
If the fuel pump does not run:
  N20-10606
–  First of all check the plug -arrow- for firm seating. Pull on the plug without pressing the locking mechanism. If the plug was not correctly plugged in, it may have caused a fault.
–  Disconnect plug -arrow-.
–  Connect the adapter for measuring method/DSO (5-pin) -VAS 5565- between the plug and the flange.
  N20-10623
–  Connect the handheld multimeter -V.A.G 1526 D- to the test contacts -1- and -5- of the adapter.
–  Connect vehicle diagnosis, measurement and information system -VAS 505x- and carry out the function „test fuel pump“.
  Note
The fuel pump is actuated for 30 seconds.
–  Read off voltage value at handheld multimeter -V.A.G 1526 D-.
l  Specified value: approx. battery voltage
If no voltage is present:
–  Test control of fuel pump relay → Vehicle diagnostic tester.
–  Test cable connections for open circuit and for short circuit → Current flow diagrams, Electrical fault finding and Fitting locations.
Voltage supply is O.K.:
–  Check power consumption of the fuel pump → Chapter.
  S20-0357

Inspecting the fuel pump operating pressure > < Testing fuel pump