Right Fuel Delivery Unit With Transfer Fuel Pump, Electrical Testing

Diagnostic Procedures

Right Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing





Special tools, testers and auxiliary items required

• (VAG1348/3A) with (VAG1348/3-2)

• (VAG1526A)

• (VAG1594A)

• (VAS5051) with (VAS5051/9)

Test Prerequisites

• Battery voltage at least 12.7 volts

• Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel) OK.

• Fuel Pump (FP) Relay (J17) OK (on relay- and fuse holder in front right footwell, position 4).





• Fuel filter OK

• Ignition switched off.

Voltage Supply, Checking

- Pry off right cover on instrument panel (- arrow -) using screwdriver.





- Pull out Fuse 31 (in fuse holder) SC31 (in relay- and fuse holder in front right footwell, position 31).

- Connect remote control (VAG1348/3A) with adapter cable (VAG1348/3-2) to left/right terminal of socket for Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel).





- Connect alligator clip to vehicle battery B+.

- Press switch of remote control.

Operating noise of the pump must be audible in vicinity of fuel tank.

• Fuel Pump (FP) runs quietly. During test of Fuel Pump (FP), surrounding noise must be avoided; if necessary, use a second technician to check.

If no flowing noise can be heard:

- Remove luggage compartment floor lining.

- Remove cover for right connector flange (- arrows -).





- Carefully release and disconnect electrical harness connector - 2 - on right connector flange.





• Disregard - 1 -.

- Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.





- Press switch of remote control.

Specified value: approx. battery voltage

If specified value is not obtained:

- Repair open circuit in wiring according to wiring diagram.

If specified value is obtained, although no operating noise can be heard from pump:

- Remove right fuel delivery unit, refer to Repair Information.

- Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.





If no malfunctions are found in wires:

- Fuel pump faulty. Replace right fuel delivery unit, refer to Repair Information.

- Install right fuel delivery unit, refer to Repair Information.

Current Draw, Checking

Test Prerequisite

• Voltage supply of Fuel Pump (FP) OK.

- Remove Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel, position 31).

- Connect remote control (VAG1348/3A) with adapter cable (VAG1348/3-2) to left terminal of socket for Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel).





- Connect alligator clip to vehicle battery B+.

- Connect tester (VAS5051) with inductive pick-up (VAS5051/9) to wire of remote control.

- Press switch of remote control.

- Measure Fuel Pump (FP) current draw.

Specified value: approx. 8 amps

If specified value is not obtained:

• At a displayed current draw of 4 amps, Fuel Pump (FP) runs dry.