Fuel Pump Electrical, Checking

WARNING: This page is about a different variant/trim than selected.

Special tools and workshop equipment required

Remote Control VAG 1348/3A with Remote Control for VAG1348 VAG 1348/3-3
Multimeter VAG 1526D
Connector Test Set VAG 1594C

Procedure

Fig 1: Identifying Fuel Pump (FP) Control Module J538

Courtesy of AUDI OF AMERICA, LLC

Fuse for Fuel Pump Control Module -J538- OK, refer to the appropriate Wiring Diagram.
Battery voltage at least 12.5 V.
FP control module OK; check in Guided Fault Finding using a vehicle diagnostic tester.
Fuel filter OK.
Ignition switched off

Vehicles through October 2006:

Fig 2: Identifying Fuel Pump (FP) Control Module, Bolts -1 & 3-, And Electrical Connector -2-

Courtesy of AUDI OF AMERICA, LLC

NOTE:

FP control module is located at front of fuel tank below exhaust system and driveshaft.

WARNING:

Danger of getting burned.

Allow exhaust system to cool.

-- Disconnect electrical connector -2-.

NOTE:

Ignore -1 and 3- and -arrow-.

Vehicles from November 2006:

NOTE:

The FP control module is located on the vehicle floor at the right under the rear sent bench, directly under the floor covering.

-- Remove right seat frame in 2nd row. Refer to SECOND ROW, 2 PASSENGER OVERVIEW .

Fig 3: Cut Floor Covering Along Perforation

Courtesy of AUDI OF AMERICA, LLC

WARNING:

Risk of injury.

Wear safety gloves.

-- Cut the floor covering along the perforation -arrows- on the right side with a carpet knife -1-.

-- Press the floor covering to the side and disconnect the connector -1-.

Fig 4: Fuel Pump (FP) Control Module -J538- And Fasteners (For Vehicles From 11.2006)

Courtesy of AUDI OF AMERICA, LLC

NOTE:

Ignore -arrows-.

All Vehicles:

Fig 5: Identifying Connector Terminals -1 & 2-, VAG 1594C Cable, Chassis Ground (-), VAG 1348/3A With VAG 1348/3-3, And Cover -A-

Courtesy of AUDI OF AMERICA, LLC

-- Connect connector terminal -2- with an adapter cable from Connector Test Set VAG 1594C to chassis Ground (GND).

-- Connect Remote Control VAG 1348/3A with Remote Control for VAG1348 VAG 1348/3-3 to terminal -1- on the connector.

-- Cover the second connector terminal of Remote Control for VAG1348 VAG 1348/3-3 with insulating tape to prevent short circuit -arrow-.

-- Route Remote Control VAG 1348/3A switch forward in engine compartment.

-- Release the retaining clip and open the cover -A- over the positive terminal clamp.

-- Connect the alligator clip to the positive terminal clamp.

-- Press the switch on the remote control.

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

NOTE:

The fuel pump runs quietly. Avoid surrounding noises while testing the fuel pump.

If no operating noise can be heard:

Fig 6: Checking Fuel Delivery Unit Electrical Terminals 1 To 4 For Continuity

Courtesy of AUDI OF AMERICA, LLC

-- Check electrical harness connection to fuel delivery unit for open circuit according to wiring diagram.

If no fault is detected in the wiring:

-- Install the fuel delivery unit. Refer to FUEL DELIVERY UNIT .

-- Check whether electrical lines between right locking flange and fuel pump are connected or check lines for continuity.

If no fault is detected in the wiring:

-- Fuel pump faulty. Replace the fuel delivery unit.

Assemble in reverse order of disassembling. Note the following:

-- Install the fuel delivery unit Installing .