Fuel Pump, Electrical Testing

Fuel pump, electrical testing

Special tools and equipment





^ Ring nut spanner 3217
^ VAG1348/3A
^ VAG1348/3-2
^ VAG1526A
^ VAG1594A

Test requirements
^ Battery voltage at least 12.7 V
^ Fuse S228 OK (position 28)





^ Relay 4 in micro-central electric (in driver's footwell, left) OK
^ Fuel filter OK
^ Ignition switched off

Test sequence
^ Open cover of fuse box at left side of instrument panel.
^ Remove fuse S228 at fuse carrier (position 28, left row, 5th large fuse from top).





^ Connect VAG1 348/3A remote control connection using adapter cables from VAG1348/3-2 at right terminal of socket from fuse -S228- (arrow).
^ Connect clamping terminal to B+.
^ Press switch of remote control.
Noise of pump must be audible.

Note: Fuel Pump (FP) runs quietly. Surrounding noise should be avoided during test of the Fuel Pump (FP).

If no noise can be heard:
TT Coupe:
^ Remove rear seat bench.

TT Roadster:
^ Remove the rear panel side trim.





All:
^ Unscrew cover -1- at right (arrows).





^ Disengage 4-pin electrical harness connector and remove (arrow).





^ Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.
^ Press switch of remote control.
Specification: approximately battery voltage

If specified value is not obtained:
^ Locate and repair open circuit using wiring diagram.
Refer to Wiring Diagrams
If specified value is obtained, although no operating noise can be heard from pump:
^ Remove fuel pump .
^ Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.
If no malfunctions are found in wires:
^ Fuel Pump (FP) is faulty. Replace fuel pump.