Fuel Pump Electrical Test - Audi Workshop Service & Repair Manuals

Checking fuel pump (electrical test)

Special tools and workshop equipment required

t	Union nut tool -3217-

t	Adapter cable -V.A.G 1348/3-2-

t	Remote control for V.A.G 1348 -V.A.G 1348/3A-

t	Hand-held multimeter -V.A.G 1526D-

t	Auxiliary measuring set -V.A.G 1594C-

Procedure

Observe test conditions → Chapter.

–	Open lid of fuse box at left side of instrument panel.

–	Pull fuse No. 28 off fuse holder (left row, 5th large fuse from the top).

–	Connect remote control -V.A.G 1348/3A- for V.A.G 1348 with adapter cable -V.A.G 1348/3-2- to right-hand terminal on fuse socket no. 28 -arrow-.

–	Connect crocodile clamp to vehicle battery (+).

–	Press remote control switch.

l	Pump should start running audibly.

Note

The fuel pump runs very quietly. Where possible, avoid noisy surroundings for this test.

If no noise can be heard from pump:

–	Unbolt cover (right-side) underneath rear seat bench.

–	Unplug electrical connector -arrow-.

–	Connect multimeter (voltage test range) between contacts -1- and -4-.

–	Press remote control switch.

l	Specification: approx. battery voltage

If specification is not obtained:

–	Locate and eliminate open circuit using current flow diagram → Current flow diagrams, Electrical fault finding and Fitting locations.

If reading matches specification although no noise can be heard from pump:

–	Remove fuel delivery unit → Chapter.

–	Check that the electrical wires between flange and fuel pump are connected and test for continuity.

If no wiring fault is detected: fuel pump is defective.

–	Renew fuel delivery unit → Chapter.

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