Fuel pump electrical, checking

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Fuel Pump Electrical, Checking

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools, testers and auxiliary items required

Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-3
Portable multimeter V.A.G 1526 B
Connector test set V.A.G 1594 C

Test conditions

Battery voltage at least 12.5 V.
Fuse on fuse panel S228 (position 28) OK.

Fig 2: Installed Location On 9-Socket Relay Carrier In Driver Footwell

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fuel Pump (FP) Relay J17 - arrow - at position 1 in 9-socket relay carrier behind driver side storage compartment is OK.
Fuel filter OK
Ignition switched off.

Test sequence

Open fuse box cover at left side of instrument cluster.
Pull out fuse on fuse panel S228 (left row, 5th large fuse from top).

Fig 3: Connecting Remote Control V.A.G 1348/3A With Adapter Cable V.A.G 1348/3-2 To Right Socket Terminal Of S228

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to right socket terminal of S228.
Connect alligator clip to vehicle battery (+).
Press switch on remote control.

Running noise of pump must be audible.

NOTE:

Fuel Pump (FP) runs quietly. Avoid surrounding noises while testing the fuel pump.

If no operating noise can be heard:

Sedan:

Remove carpeting in luggage compartment.
Fold forward right rear seat backrest, if necessary.

Wagon:

Remove left 1/3 backrest →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.
Remove left side luggage compartment trim and dirt tray →
- 70 - INTERIOR TRIM
- 70 - INTERIOR TRIM for BODY INTERIOR - CABRIOLET
.

All models:

Fig 4: Unbolting Cover For Locking Flange In Luggage Compartment

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Unbolt locking flange cover in luggage compartment - arrows -.

Fig 5: Identifying Locking Flange Electrical Harness Connectors

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Disconnect electrical harness connector - 1 - at locking flange.

NOTE:

Ignore - 2 -.

Fig 6: Identifying Connector Terminals 1 And 4

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Connect hand multimeter V.A.G 1526 B between terminal - 1 - and - 4 - for voltage measurement.
Press switch on remote control.

Specification: approx. battery voltage.

If specification is not obtained:

Repair open circuit in wiring according to wiring diagram.

Fig 7: Checking Electrical Circuit Between Terminals Of Fuel Delivery Unit And Fuel Pump For Continuity

Courtesy of VOLKSWAGEN UNITED STATES, INC.

If specified value is obtained, although no running-noise can be heard at pump:

Remove fuel delivery unit → Fuel delivery unit, removing and installing .
Check if electrical wiring between flange and fuel pump is connected and has continuity.

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

Install fuel delivery unit Installing .