Volkswagen Golf / Golf GTI / Golf Variant. Manual — part 757
– Make sure that the drain valve -C- on the Pressure Tester
-1- is closed.
– The shut-off valves -A- and -B- on the -VAS6550- -1- are
opened.
– Connect the Vehicle Diagnostic Tester .
– Select the fuel pump output diagnostic test mode in OBD.
Note
♦
The fuel pump is now activated to build up the fuel pressure.
♦
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.
– Read the fuel pressure on the pressure gauge.
• Specified value: approximately 4.0 bar
If the fuel pressure is OK, check the residual pressure. Refer to
⇒ “8.1.5 Residual Pressure, Checking”, page 95
If the specified value is exceeded:
– The pressure relief valve in the fuel delivery unit is faulty.
– Replace the fuel delivery unit. Refer to
⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and
.
If the specified value is not obtained:
Proceed as follows to check the fuel pressure at the fuel delivery
unit:
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 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.
– Remove the fuel lines -1- from the flange. Disconnect the con‐
nector couplings. 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.
– Connect the -VAS6550- to the fuel delivery unit -1- using the
-VAS6550/3-4- .
– Connect the -VAS6550/3-3- between the -VAS6550- and the
fuel supply line -2-.
– Pull on the connector couplings to check them for secure fit.
– Make sure that the drain valve -C- on the Pressure Tester
-1- is closed.
– The shut-off valves -A and B- and -B- on the -VAS6550- -1-
are opened.
– Repeat the output diagnostic test mode to build up the fuel
pressure again.
If the specified value is obtained:
– Check the fuel lines for possible restrictions (kinks) or block‐
ages.
– Check the fuel line for leaks and damage.
If the specified value is not obtained:
– Remove the fuel delivery unit (refer to
⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and
) and inspect it for debris.
– Make sure all hoses -arrows- are connected.
– Check the fuel lines for possible restrictions (kinks) or block‐
ages.
– Check the fuel lines for leaks and damage.
If no error can be found:
– If the fuel pump is faulty, replace the fuel delivery unit. Refer
to
⇒ “2.2 Fuel Delivery Unit/Fuel Level Sensor, Removing and
.
8.1.5
Residual 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
– 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‐
• Fuel pressure is OK and the -VAS6550- is connected. Check
the fuel pressure. Refer to
– Connect the -VAS6550/2- between the fuel line from the fuel
tank and the shut-off valve -B- on the -VAS6550- .
– Connect the -VAS6550/1- between the fuel line leading to the
engine -1- and the shut-off valve -A- on the -VAS6550- .
Test Sequence:
– Connect the Vehicle Diagnostic Tester .
– Select the fuel pump output diagnostic test mode in OBD.
Note
♦
The fuel pump is now activated to build up the fuel pressure.
♦
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.
– Read the fuel pressure on the pressure gauge.
• Specified value: greater than or equal to 4.0 bar
– End the OBD and turn off the ignition.
– Observe the decrease in pressure on the pressure gauge. The
pressure must not drop below 3.0 bar after 10 minutes.
If the pressure drops:
– Check all of the fuel lines for leaks and damage.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст