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Test feed pressure of fuel pump > < Testing fuel pump

Octavia Mk2

Checking function and voltage supply of fuel pump
Checking function and voltage supply of fuel pump
Special tools and workshop equipment required
t  Adapter for measuring method/DSO (5-pin), e.g. -VAS 5565-
t  Multimeter, e.g. -V.A.G 1526D-
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
  Note
t  Safety precautions when working on the fuel supply system → Chapter.
t  Observe rules for cleanliness → Chapter.
For the vehicles Octavia II, Superb 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 all vehicles
   
–  Unclip retaining catches -arrows- of cover for the fuel delivery unit and remove cover.
  Note
For vehicles with auxiliary heating, the plug connection for the dosing pump -V54- must be disconnected additionally.
–  Switch on ignition.
l  The fuel pump must be heard to start running.
–  Switch off ignition.
If the fuel pump does not run:
–  First of all check the plug for correct fit. Pull on the plug without pressing the locking mechanism. If the plug was not correctly plugged in, it may have caused a fault.
–  Disconnect the plug from the flange of the fuel delivery unit.
–  Connect the adapter for measuring method/DSO (5-pin) -VAS 5565- between the plug and the flange.
  A20-1206
–  Connect the handheld multimeter -V.A.G 1526D- 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 1526D-.
l  Specified value: approx. battery voltage
If voltage is not 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.:
–  Remove fuel delivery unit:
t  Octavia II with front-wheel drive, Yeti → Chapter.
t  Octavia II with four-wheel drive, Superb II → Chapter.
–  Check whether the electric wiring between the flange and fuel pump is connected and test for continuity.
If the wiring is O.K.:
–  Replace fuel delivery unit:
t  Octavia II with front-wheel drive, Yeti → Chapter.
t  Octavia II with four-wheel drive, Superb II → Chapter.
  N20-10423

Test feed pressure of fuel pump > < Testing fuel pump