Fuel Pump Electrical, Checking

Special tools, testers and auxiliary items required 

• Hand held remote control (jumper).
• Multimeter.
• Electrical connector test lead set.
• Pressure gauge (High pressure)

Test conditions 

• Battery voltage at least 12.5 V.
• The fuel pump fuse OK.
• The Fuel Pump (FP) Control Module J538 OK.
• The fuel filter OK

• The ignition switched off.

Test sequence 

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

• Remove the right locking flange cover and bolts - arrows  -.

• Disconnect the electrical harness connector - arrow  - at the right locking flange.
• Connect a Hand held remote control (jumper) to terminal - 1  - of the fuel delivery unit and to vehicle battery (+).

• Connect a jumper cable from a Electrical connector test lead set to terminal - 4  - of the fuel delivery unit and to vehicle Ground (GND).
• Press the switch on the Hand held remote control (jumper) in.

The fuel pump must run and an audible noise of the fuel pump running should be heard.

If no operating noise can be heard:

• Using a Multimeter , check the electrical circuit between terminals - 1  - and - 5  - of the fuel delivery unit for continuity.

Specified value: 0 ohms.

If a malfunction is detected in the electrical circuit:

• Check the wiring for a short circuit to Battery positive (+) or an open circuit.
• Check the electrical harness connector for damage, corrosion, lose or broken terminals.
• If necessary, repair the electrical circuit.

If no malfunction is detected in the wiring, replace the fuel pump. → 20 - FUEL SUPPLY SYSTEM .

• Install the fuel delivery unit → 20 - FUEL SUPPLY SYSTEM .

Final procedures 

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

• End of diagnosis.