Fuel pump electrical, checking

Special tools, testers and auxiliary items required 

• Remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2
• 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.

• Fuel Pump (FP) Relay J17 - arrow  - at position 1 in 9-socket relay carrier behind the 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).

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

• Running noise of pump must be audible.

If no operating noise can be heard:

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

• Unbolt cover for right locking flange - arrows  -.

• Disconnect electrical harness connector - 1  - at right locking flange.

• 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.

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 .