Audi Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2
• ◆ Hand multimeter V.A.G 1526 or V.A.G 1526 A
• ◆ Adapter set V.A.G 1594 A

Requirements for test:

• ● Battery voltage not less than 12 V
• ● Fuse No. 28 OK

• ● → Relay 6 in central electrics unit OK
• ● Fuel filter OK
• ● Ignition switched off

Test sequence

• ‒ Open fuse box cover on the left side of the dashboard panel.

• ‒ Pull fuse No. 28 off fuse carrier (left row, 5th large fuse from the top).
• ‒ → Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to right-hand terminal of fuse socket No. 28 -arrow-.
• ‒ Connect clamp to vehicle battery (+).
• ‒ Press remote control switch.
• ‒ Pump should start running audibly.

Note:

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

If pump does not start running:

• ‒ Detach trim in luggage compartment.
• ‒ Unbolt cover for flange on fuel tank under floor trim in luggage compartment.
• ‒ → Release and unplug 4-pin connector -1-.

• ‒ → Set hand-held multimeter V.A.G 1526 to voltage measuring range (20 V direct current) and connect to contact 1 (green/yellow) and contact 4 (brown) of connector using test leads from V.A.G 1594 A.
• ‒ Press and hold remote control switch, and read off voltage.
• ‒ Specification: approx. battery voltage

If the specification is obtained, even though the fuel pump did not run, remove flange as follows:

• ‒ → Mark the supply pipe -2- and return pipe -3-, then pull pipes off flange.

• ‒ → Remove union nut with spanner 3217.
• ‒ Remove flange and seal out of opening in fuel tank.

• ‒ → 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 .
• ‒ Install flange .