Volkswagen Golf Variant / Jetta. Manual - part 418

driver footwell.

– Switch the ignition on.
– Perform “Guided Functions, check electric fuel pump(s)”. Re‐

fer to Vehicle Diagnostic Tester .

Note

The Transfer Fuel Pump - G6- is now activated for 60 seconds.

– Read the voltage value on the Analog/Digital Multimeter .
• Specified value: approximately battery voltage
– Switch off the ignition.
If there is no voltage:
– Check the Fuel Pump Relay - J17- activation and check the

wires for interruption and short circuit. Refer to Vehicle Diag‐

nostic Tester .

Voltage supply OK:
– Remove the fuel delivery unit. Refer to

⇒ “4.6 Fuel Delivery Unit, Removing and Installing”,

page 241

– Check if the wires between the flange and Fuel Pump Relay -

J17- are connected and have a continuous passage.

If no open circuits are found:
– Replace the fuel delivery unit if the Fuel Pump Relay - J17- is

faulty. Refer to

⇒ “4.6 Fuel Delivery Unit, Removing and Installing”,

page 241

6.4.3

Current Draw, Checking

DANGER!

♦ Observe safety precautions when working on fuel supply.

Refer to

⇒ “1 Safety Precautions when Working on Fuel Supply

System”, page 223

♦ Pay attention to the guidelines for clean working condi‐

tions. Refer to

⇒ “2 Guidelines for Clean Working Conditions”,

page 224

Always pay attention to these instructions before and during

work.

Special tools and workshop equipment required
♦ Vehicle Diagnostic Tester
♦ Vehicle Diagnostic Tester - Test Adapter - 5 Pin - VAS5565-
♦ Pickup clamp - VAG1526B/2-
♦ Analog/Digital Multimeter - FLU83III-
♦ Pressure Tester Kit - VAS6551-

6. Fuel Supply System, Servicing

255

defogger, must be switched off.

• Fuel temperature in the fuel tank above 10 °C (50 °F).

Note

The battery voltage and the temperature of the diesel fuel strongly

influence the current draw of the fuel pump. Make sure the battery

voltage is at least 12 Volts and the temperature of the diesel fuel

inside the fuel tank is not at the freezing point.

Test Sequence
– Remove the bench seat. Refer to ⇒ Body Interior; Rep. Gr.

72 ; Rear Seats; Rear Bench Seat, Removing and Installing .

– Unclip the cover -1- for the fuel delivery unit. The arrow -2-

points in the direction of travel.

– Disconnect -1- from the fuel delivery unit flange.

256

- VAS5565- between the connector and the flange.

– Connect the current probe -A- to the red cable with the word

“current probe” on the Vehicle Diagnostic Tester - Test Adapt‐

er - 5 Pin - VAS5565- .

Note

The current probe of the Analog/Digital Multimeter - FLU83III- can

also be connected to the red cable - with the label “current probe”

- for the Vehicle Diagnostic Tester - Test Adapter - 5 Pin -

VAS5565- .

– Connect the Analog/Digital Multimeter - FLU83III- to the Pick‐

up Clamp .

– Disconnect the connector -1- from the Auxiliary Fuel Pump -

V393- (in right side of engine compartment).

– Connect the Vehicle Diagnostic Tester -1- as follows:
– Connect diagnostic cable -2- to Data Link Connector (DLC) in

driver footwell.

– Switch the ignition on.
– Perform “Guided Functions, check electric fuel pump(s)”. Re‐

fer to Vehicle Diagnostic Tester .

Note

The Auxiliary Fuel Pump - V393- is now activated for 60 seconds.

– Read the current draw on the Analog/Digital Multimeter .
Specified Value:
• minimum 5.5 amp
• maximum 7.5 amp
– Switch off the ignition.
If the current draw is outside of the specified value:
– Replace the fuel delivery unit if the Auxiliary Fuel Pump - V393-

is faulty. Refer to

⇒ “4.6 Fuel Delivery Unit, Removing and Installing”,

page 241

6.5

Auxiliary Fuel Pump - V393- (Inline Fuel

Pump), Checking

Special tools and workshop equipment required

6. Fuel Supply System, Servicing

257