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Check fuel flow rate > < 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 relay -J17 - O.K.
l  Fuel pump fuse O.K. → Current flow diagrams, Electrical fault finding and Fitting locations.
Work procedure
  Note
The function of the fuel pump is tested with the actuator diagnosis.
–  Removing rear seat bench → Body Work; Rep. gr.72.
–  Connect → Vehicle diagnostic, testing and information system VAS 5051.
–  Switch on ignition.
–  On the display press consecutively the buttons for „Vehicle self-diagnosis“,„01 - Engine electronics“ and „03 - Actuator diagnosis“.
–  Press the right arrow button on the display in order to actuate the fuel pump relay -J17-.
l  The fuel pump must be pulsed for start-up.
  Note
The fuel pump runs very quietly.
–  Switch off ignition.
If the fuel pump does not run:
–  Remove the cover from the fuel delivery unit.
  Note
For vehicles with auxiliary heating, the plug connection for the dosing pump -V54- must be disconnected additionally.
   
–  First of all check the plug connection -arrow- for correct fit. To do so, pull on the plug connection 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:
–  Disconnect the plug connection -arrow- from the fuel delivery unit.
–  Check the contacts at the plug and at the fuel delivery unit for damage.
If no damage was detected:
  N20-10623
–  Connect the adapter for measuring method/DSO (5-pin) -VAS 5565- to the plug and to the fuel delivery unit.
–  Connect the multimeter -V.A.G 1715- to the terminals -1 and 5- of the adapter for measuring method/DSO (5-pin) -VAS 5565-.
–  Once again initiate the „03 - Actuator diagnosis“ and actuate the fuel pump relay -J17-, the voltage must be pulsed in order to increase.
Supply voltage not O.K.:
–  Determine and remove open circuit in the wiring according to the current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.
Supply voltage O.K.:
–  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.
  N20-10423

Check fuel flow rate > < Testing fuel pump