Volkswagen Golf / Golf GTI / Golf Variant. Manual - part 755

Test Sequence:

Note

The output diagnostic test mode checks the fuel pump function.

– Pay attention to all safety precautions. Refer to

⇒ “1 Safety Precautions”, page 1

 .

– Follow the guidelines for clean working conditions. Refer to

⇒ “3.1 Parking/Auxiliary Heater and Fuel System Clean Work‐

ing Conditions”, page 4

 .

– Connect the Vehicle Diagnostic Tester -1- as follows:
– Connect the diagnostic cable connector -2- to the diagnostic

connection inside the driver footwell.

– Switch the ignition on.
– Select the fuel pump output diagnostic test mode in OBD.
The fuel pump must now accelerate slowly up to the maximum

RPM.

Note

♦

The fuel pump runs very quietly.

♦

If the output diagnostic test mode is performed several times

in succession, it may be necessary to briefly start the motor

before repeating the output diagnostic test mode.

– Switch off the ignition.
If the fuel pump does not start:
Golf Sportsvan:
– Remove the right rear seat. Refer to ⇒  Body Interior; Rep. Gr. 

72 ; Rear Seats; Bench Seat / Single Seat, Removing and In‐

stalling .

– Partially loosen the cover -1- in the carpet at the separating

line -arrow-.

– Do not separate the cover completely from the carpet so that

later it will be installed correctly.

– Only loosen so far that the cover can be folded up.
– Fold up the cover in the direction of the -arrow-.
Golf and Golf Wagon:
– Remove the rear bench seat. Refer to ⇒  Body Interior; Rep.

Gr.  72 ; Rear Seats; Bench Seat / Single Seats, Removing

and Installing .

Continuation for All Vehicles:
– Unclip the right sealing flange cover -1- at the tabs -arrows-

using the -3409- .

– Unclip the grommet -1- downward out of the cover -2-.
– Guide the cover -2- on the wiring harness -3- toward the rear.

– Pull on the connector -arrow- without pressing the release to

make sure the connection is secure.

– Repeat the fuel pump output diagnostic test mode if the con‐

nector was not connected correctly.

– Release and disconnect the connector -arrow-.
– Check the contacts on the connector and on the fuel delivery

unit for damage.

– Connect the -VAS5565- to the connector and to the fuel de‐

livery unit.

– Connect an Analog/Digital Multimeter to the wires -1- and -5-

on the -VAS5565- .

– Switch the ignition on.
• Specified value: approximately battery voltage
If the specified value is not obtained:
– Locate and repair the open circuit according to the wiring dia‐

gram. Refer to ⇒ Wiring diagrams, Troubleshooting & Com‐

ponent locations.

If no faults can be found:

WARNING

The fuel line is under pressure.
Fuel poses a risk of injury to the eyes and skin.
Wear protective eyewear and protective clothing to avoid injury

and contact with skin. Place a cleaning cloth around the con‐

nection  point  before  loosening  hose  connections.  Carefully

open the connection point to release the pressure.

– Drain the fuel tank. Refer to

⇒ “1.3 Fuel Tank, Draining”, page 35

 .

– Remove the fuel lines -1- from the flange. Disconnect the con‐

nector couplings. Refer to

⇒ “4.1 Connector Couplings, Disconnecting”, page 62

 .

Vehicles with Parking Heater:
– Remove the fuel line -2- to the Metering Pump - V54- for the

parking heater on the sealing flange.

– Open the lower clamp to do this.
– Carefully remove the fuel line -2-.

Continuation for All Vehicles:
– Open the locking ring using the -T10202- .
– Check if the wiring between the flange and fuel pump is con‐

nected.

– Inspect the contacts for damage.
If no open circuits are found:
– If the fuel pump is faulty, replace the fuel delivery unit. Refer

to

⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and

Installing”, page 52

 .

8.1.3

Fuel Pressure, Checking

Special tools and workshop equipment required
♦ Trim Removal Wedge - 3409-
♦ Pressure Tester Kit - VAS6550-
♦ Pressure Tester Kit - Adapter Set - Hose 3 - VAS6550/3-3-
♦ Pressure Tester Kit - Adapter Set - Hose 4 - VAS6550/3-4-
♦ Vehicle Diagnostic Tester
Conditions:
• Power supply is OK.

⇒ “8.1.1 Fuel Pumps, Checking Function and Power Supply”,

page 81

 .

– Pay attention to all safety precautions. Refer to

⇒ “1 Safety Precautions”, page 1

 .

– Follow the guidelines for clean working conditions. Refer to

⇒ “3.1 Parking/Auxiliary Heater and Fuel System Clean Work‐

ing Conditions”, page 4

 .

– Remove the supply line -1-. Disconnect the connector cou‐

plings. Refer to

⇒ “4.1 Connector Couplings, Disconnecting”, page 62

 .

WARNING

The fuel line is under pressure.
Fuel poses a risk of injury to the eyes and skin.
Wear protective eyewear and protective clothing to avoid injury

and contact with skin. Place a cleaning cloth around the con‐

nection  point  before  loosening  hose  connections.  Carefully

open the connection point to release the pressure.

– Collect leaking fuel with a cleaning cloth.

– Connect the -VAS6550/1- to the connection -A- on the -

VAS6550- .

– Connect the -VAS6550/1- to the fuel supply line -1- to the en‐

gine.

– Connect the -VAS6550/2- to the connection -B- on the -

VAS6550- .

– Connect the fuel line to the fuel tank with the -VAS6550- via

the -VAS6550/2- .

– Pull on the connector couplings to check them for secure fit.