Fuel pump electrical, testing

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Special tools, testers and auxiliary items required

Hand held remote control (jumper).
Multimeter.
Electrical connector test lead set.

Fig 1: Identifying Main Fuse Panel

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Test conditions

Battery voltage 12.5 V.
Fuse - 29 - in fuse holder at left of instrument panel is OK.
Fuel filter OK.
Ignition switched off.

Test sequence

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

Fig 2: Identifying Right Sealing Flange Cover Retainers

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Remove cover retainers - arrows - from the right sealing flange.

Fig 3: Disconnecting Electrical Harness Connector From Fuel Delivery Unit

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

Fig 4: Connecting Jumper Cable From Electrical Connector Test Lead Set To Terminal 5 Of Fuel Delivery Unit And To Vehicle Ground (GND)

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Connect a jumper cable from a Electrical connector test lead set to terminal - 5 - of the fuel delivery unit and to vehicle Ground (GND).
Press switch on the Hand held remote control (jumper).

NOTE:

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

Listen for an operating noise from the fuel pump.

If no operating noise is heard:

Remove the fuel delivery unit. Refer to → 20 - FUEL SUPPLY SYSTEM .

Fig 5: Checking Electrical Circuit Between Terminals Of Fuel Delivery Unit And Fuel Pump For Continuity

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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 electrical circuit, replace the fuel pump. Refer to → 20 - FUEL SUPPLY SYSTEM .

Final procedures

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

Check the DTC memory.
If necessary, erase the DTC memory. Refer to Diagnostic Mode 04: Reset/delete diagnostic data .
If the DTC memory was erased, generate readiness code. Refer to Readiness Code .

End of diagnosis.