With Generic Scan Tool

Fuel Pump, Checking

Special tools and equipment
- VAG1348/3A remote control with VAG1348/3-2 adapter cable
- VAG1526 or VAG1526 A hand-held multimeter
- VAG1594A connector test kit

All Wheel Drive (AWD) vehicles
- 3087 wrench for tank sensor

Front Wheel Drive (FWD) vehicles
- 3217 ring nut wrench

Test requirements:
- Battery voltage at least 12 V







- Fuse in fuse holder -S228- OK (position 28)







- Fuel Pump (FP) relay (position 4) in central electric behind driver's side storage compartment OK.
- Fuel filter OK
- Ignition switched off.

Test sequence
- Open cover of fuse box at left side of instrument cluster.
- Remove Fuse in fuse holder -S228- (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 in fuse holder -S228- (arrow).
- 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 flowing noise can be heard:

All Wheel Drive (AWD) vehicles
- Remove rear seat bench.
- Unscrew cover at right beneath rear seat bench







- Carefully disengage and disconnect electrical 4-pin harness connector (arrow).

Front Wheel Drive (FWD) vehicles
- Unscrew cover for connector flange below the luggage compartment carpet.







- Carefully disengage and disconnect electrical 4-pin harness connector (arrow).

Continuation for all vehicles







- Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.
- 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 point. Then release pressure by carefully loosening connection.

All Wheel Drive (AWD) vehicles







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

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.







- Use 3087 wrench to remove locking ring.

Front Wheel Drive (FWD) vehicles







- Mark fuel supply line -2- and fuel return line -1- and disconnect from connector flange.







- Use ring nut wrench 3217 to remove union nut.

Continuation for all vehicles
- 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.

If no wiring faults are found:
- Fuel Pump (FP) malfunctioning, replace fuel pump.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Readiness Code, Generating