Fuel Pump Electrical, Checking

Fuel Pump Electrical, Checking







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.







- 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.







- Vehicles with FSI engine: Fuel Pump (FP) Control Module J538 OK; checking.
- Fuel filter OK
- Ignition switched off.

Test sequence
- Remove rear seat bench.







- Unbolt cover for right locking flange - arrows - .

Audi RS4:







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

All:







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







- 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.







- 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.