Transfer Fuel Pump, Checking

Special tools and workshop equipment required

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

Test conditions

Battery voltage at least 12.5 volts
Fuel filter OK.
Ignition switched OFF.

Test procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .

NOTE:

When the door is opened the fuel pump is activated for 2 seconds to build up the pressure in the fuel system.

Models with an airbag are installed with a fuel shut - off system. It reduces the danger of a fire in a crash as the fuel pump is switched off via the fuel pump relay.

Test sequence

-- Remove the rear seat bench. Refer to the appropriate Service Information.

-- Remove the fuel delivery unit cover located under the right rear seat. Refer to the appropriate Service Information for seat removal.

-- Disconnect the electrical harness connector from the Transfer Fuel Pump (FP) -G6- fuel delivery unit.

-- Connect a hand - held remote control (jumper) to terminal 1 of the fuel delivery unit and to vehicle battery voltage.

-- Connect a jumper cable from an Electrical connector test lead set to terminal 4 of the fuel delivery unit and to vehicle Ground (GND).

Fig 1: A Jumper Cable From A Electrical Connector Test Lead Set Connected To Terminal Of Fuel Delivery Unit And To Vehicle Ground

Courtesy of AUDI OF AMERICA, LLC

-- 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 the specified value was not obtained:

-- Remove the fuel delivery unit.

-- Using a Multimeter, check the electrical circuit between terminals 1 to and 4 of the fuel delivery unit pump motor for resistance.

Fig 2: Checking Electrical Circuit Between Terminals And Of Fuel Delivery Unit For Resistance

Courtesy of AUDI OF AMERICA, LLC

Specified value: 1.5 Ω max.

If the specified value was Not obtained:

-- Check the wiring for an open circuit, a short circuit.

-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

-- If necessary, repair the wiring connection.

If the specified value was obtained:

-- Replace the Fuel delivery unit -GX1-

Final procedures

-- Reinstall the fuel delivery unit cover located under the right rear seat. Refer to the appropriate Service Information for seat removal.

-- Reinstall the rear seat bench. Refer to the appropriate Service Information.

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

Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .