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Exhaust turbocharger, G-charger > < Checking voltage supply of fuel system pressurisation pump

Polo Mk5

Checking current consumption of fuel system pressurisation pump
Checking current consumption of fuel system pressurisation pump
Special tools and workshop equipment required
t  Vehicle diagnosis tester
t  Hand-held multimeter -V.A.G 1526D- or pickup clamp -V.A.G 1526B/2-
t  Test instrument adapter/DSO (5-pin) -VAS 5565-
t  Vehicle diagnosis tester
  Note
t  The battery voltage and the diesel fuel temperature have a great influence on the current draw of the fuel pump. This is why it must be ensured that battery voltage is at least 12.5 V whilst checking.
t  Depending on the season, make sure that the vehicle is filled with winter diesel if necessary.
Test prerequisites
l  Battery voltage at least 12.5 V
l  Diesel fuel temperature above 10 °C
»Carry out the following work sequence«
–  Fold rear seat bench up → General body repairs, interior; Rep. gr.72.
–  Raise cover of fuel delivery unit.
   
–  First check that connector -arrow- is fitted securely by pulling connector without pressing catch. The connector can cause a fault if it has not been fitted correctly.
  N20-10623
–  Pull off connector -4-.
  N20-10823
–  Connect test instrument/DSO adapter (5-pin) -VAS 5565- to connector and fuel delivery unit.
–  Connect pick-up clamp -A- to red cable - with lettering „pick-up clamp“ - of test instrument/DSO adapter (5-pin) -VAS 5565-.
  Note
Pickup clamp of hand-held multimeter -V.A.G 1715- can also be connected to red terminal with lettering „pickup clamp“ of test instrument adapter/DSO (5-pin) -VAS 5565-.
–  Switch ignition on.
–  Connect vehicle diagnosis tester and carry out guided function „Checking electronic fuel pump(s)“.
  Note
The fuel pump is now activated for 30 seconds.
–  Read current draw on hand-held multimeter -V.A.G 1526D-: Specification: min. 8.0 amperes, max. 14.0 amperes.
If the measured value is not within specifications:
–  Remove fuel delivery unit → Chapter.
–  Check that the electrical lines between flange and fuel pump are connected and have continuity.
If no open circuit can be found
–  Renew fuel delivery unit → Chapter
  S20-0358

Exhaust turbocharger, G-charger > < Checking voltage supply of fuel system pressurisation pump