SEAT Workshop Service and Repair Manuals

Checking current consumption of fuel system pressurisation pump Special tools and workshop equipment required

t  Manual multimeter -V.A.G 1526D-, see equivalent → Anchor

t  Measurement adapter / DSO (5-pin) -VAS 5565-, see equivalent → Anchor t  Ammeter clamp -V.A.G 1526B/2- t  Vehicle diagnostic, testing and information system -VAS 505X-, see equivalent → Anchor   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 V l  Diesel fuel temperature above 10 °C »Carry out the following work sequence« –  Fold rear seat bench forwards.

–  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.

–  Disconnect connector -1-.

–  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 The current clamp of multimeter -V.A.G 1715- can also be connected to red terminal with lettering „current clamp“ of adapter for measuring equipment / DSO (5-pin) -VAS 5565-. –  Switch on the ignition. –  Connect the Vehicle diagnostics tester -VAS 505X- and perform the guided function „Fuel pump: Actuate (Fuel pump: check “.   Note The fuel pump is now activated for 30 seconds. –  Read off the current consumption on the hand-held multimeter -V.A.G 1526D-: Specification: min. 8,0 Amps, max. 14,0 Amps –  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 –  Replace fuel delivery unit → Chapter.