Test sequence

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2004 Audi A6, 2003 Audi S6, 2003 Audi A6, 2002 Audi S6, and 2002 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

Open cover of fuse box at left side of instrument cluster.
Remove fuse S228 at fuse carrier (position 28) (left row, 5th large fuse from top).
Connect V.A.G 1348/3A remote control connection using adapter cables from VAG1348/3-2 at right terminal of socket from fuse S228 (arrow).

Fig 1: Connecting VAG1348/3A Remote Control Connection To Fuse Position 28

Courtesy of AUDI OF AMERICA, INC.

Connect alligator clip to vehicle battery B+.
Press switch of remote control.
- Operating noise of the pump must be audible in vicinity of fuel tank.

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

If no operating noise can be heard:

Remove rear seat bench.
See SEAT BENCH, REMOVING AND INSTALLING .
Remove cover for right connector flange (arrows).

Fig 2: Removing Cover For Right Connector Flange

Courtesy of AUDI OF AMERICA, INC.

Carefully release and disconnect electrical harness connector (arrow).

Fig 3: Disconnecting Electrical Harness Connector

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Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.

Fig 4: Identifying Harness Connector Terminals

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Press switch of remote control.
- Specified value: approx. battery voltage

If specified value is obtained, although no operating noise can be heard from pump:

CAUTION: Fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening connection.

Mark fuel supply line -1- and fuel return line -2- and disconnect from connector flange (right side of vehicle).

Fig 5: Marking Fuel Supply Line And Fuel Return Line & Disconnect Connector Flange
Courtesy of AUDI OF AMERICA, INC.

CAUTION: Connector flange may only be opened when fuel tank is maximum 1/4 full. Otherwise, a large amount of fuel will spill out. Empty fuel tank if necessary. Procedure. See EMPTY FUEL TANK .
Use 3087 wrench to remove locking ring.

Fig 6: Removing Locking Ring Using 3087 Wrench

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Pull connector flange and sealing ring from opening of fuel tank.
Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.

Fig 7: Checking Whether Electrical Wires Between Flange And Fuel Pump Are Connected

Courtesy of AUDI OF AMERICA, INC.

If no malfunction is detected in wires, Fuel Pump (FP) is faulty - replace fuel pump.

Install Fuel Pump (FP). See INSTALLING . Observe notes for connecting battery.