Function and voltage supply, checking Volkswagen Golf Mk4

Function and voltage supply, checking

Note. In the continuing work procedure, it is possibly necessary to disconnect the battery Ground (GND) strap. Check whether a coded radio is installed. If so, obtain anti-theft coding beforehand.

1. Remove cover from fuel delivery unit.
2. Briefly operate starter. Fuel Pump (FP) must run audibly.
3. Switch off ignition.

If fuel pump does not activate

1. Remove cover in front of fuse holder.

Scheme 608

1. Pull fuse No. 28 from fuse holder.
2. Connect remote control V.A.G 1348/3A with adapter cable V.A.G 1348/3-2 to contact 28a to fuel pump and battery positive (+).
3. Operate Remote Control V.A.G 1348/3A.

If fuel pump is activated

1. Check fuel pump relay according to wiring diagram with Test System V.A.G 1466 A, refer to Electrical Wiring Diagrams, Troubleshooting and Component Locations.

If fuel pump is not activated

1. Disconnect 4-pin connector from flange at fuel delivery unit.

Scheme 609

1. Connect voltage tester V.A.G 1527B using adapter cables from connector test kit V.A.G 1594C to outer terminals of connector.
2. Operate remote control. LED must light up.

LED does not light up

1. Locate and repair open circuit in wiring using wiring diagram, refer to Electrical Wiring Diagrams, Troubleshooting and Component Locations.

LED lights up (voltage supply OK)

1. Use ring nut spanner 3217 to remove union nut.
2. Check if electrical wiring between flange and fuel pump is connected.

If no open circuits are found

1. Fuel Pump (FP) faulty, replace fuel delivery unit refer to «Fuel delivery unit, removing and installing»(ref-255004-S01310767442007052300000) .