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

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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.

Fig 2: Identifying Main Fuse Panel

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Fuse on fuse panel S228 (position 28) OK.

Fig 3: Installed Location On 9-Socket Relay Carrier In Driver Footwell

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Vehicles with MPI engine: Fuel Pump (FP) Relay J17 - arrow - at position 1 in 9-socket relay carrier behind driver side storage compartment is OK.

Fig 4: Identifying Fuel Pump (FP) Control Module J538

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Vehicles with FSI engine: Fuel Pump (FP) Control Module J538 OK; checking → Fuel Pump (FP) Control Module J538 , checking (vehicles with 4-cyl. TFSI engine) .
Fuel filter OK
Ignition switched off.

Test sequence

Remove rear seat bench →
- 72 - SEAT - FRAMES
- 72 - SEAT - FRAMES for BODY INTERIOR - CABRIOLET
.

Fig 5: Removing Cover Bolts For Locking Flange

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Unbolt cover for right locking flange - arrows -.

Audi RS4:

Fig 6: Removing Electrical Wires With Connector From Locking Flange Opening

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Remove electrical wires with connector - arrow - from locking flange opening and lay them aside.

All:

Fig 7: Disconnecting Electrical Harness Connector At Right Locking Flange

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Disconnect electrical harness connector - arrow - at right locking flange.

Fig 8: Connecting Other End Of Hand Held Remote Starter (Jumper) To Vehicle Battery (+)

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Connect remote control V.A.G 1348/3 A with connection V.A.G 1348/3-3 to contact - 1 - using an adapter cable from connector test set V.A.G 1594 C.
Using insulating tape, tape over the second contact of connection V.A.G 1348/3-3 to prevent a short circuit - arrow -.
Connect contact - 4 - to vehicle Ground (GND) using a jumper cable from the connector test set V.A.G 1594 C.
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:

Remove fuel delivery unit → Fuel delivery unit, removing and installing .

Fig 9: Checking Electrical Circuit Between Terminals Of Fuel Delivery Unit And Fuel Pump For Continuity

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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 .