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Home >> Volkswagen >> 2018 >> Beetle S, 2D Hatchback >> Repair and Diagnosis >> External Pages >> Different car >> Section 129 (2.0L - Fuel Supply - Engine Code(S): CJAA & CVCA (Hatchback)) >> 20 Fuel Supply >> Description And Operation >> Transfer Fuel Pump -G6-, Checking >> Fuel Pressure, Checking Engine Codes CVCA >> Test Sequence

Test Sequence

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-- Follow all safety precautions. Refer to SAFETY PRECAUTIONS .

-- Follow the guidelines for clean working conditions. Refer to PARKING/AUXILIARY HEATER AND FUEL SYSTEM CLEAN WORKING CONDITIONS .

-- Turn off the ignition.

-- Remove the engine cover. Refer to REMOVAL AND INSTALLATION .

-- Open the clamp -arrow-.

Fig 1: Identifying Clamp
GWWN20-11018Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
WARNING:

Fuel lines are under pressure.

Danger of personal injury to eyes and skin.

Wear protective eyewear and protective clothing in order to avoid injury and contact with the skin. Wrap a cloth around the connection before loosening hose connections. Open the connection carefully and release the pressure.

-- Remove the fuel supply line -1- from the high pressure pump -2-.

-- Insert the Diesel Pressure Tester Kit - Adapter Set - Adapter 1 VAS 6551/5-1 into the supply line -1- and secure with a clamp.

Fig 2: Identifying Diesel Pressure Tester Kit - Adapter Set - Adapter 1
GWWN20-11014Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the Diesel Pressure Tester Kit - Hose 2 VAS 6551/2 between the Diesel Pressure Tester Kit - Adapter Set - Adapter 1 VAS 6551/5-1 and the connection -A- of the Diesel Pressure Tester Kit VAS 6551.

-- Connect the Diesel Pressure Tester Kit - Adapter Set - Connection Hose 2 VAS 6551/5-2 between the connection -B- of the Diesel Pressure Tester Kit VAS 6551 and the high pressure pump -2-.

-- Secure the Diesel Pressure Tester Kit - Adapter Set - Connection Hose 2 VAS 6551/5-2 on the high pressure pump -2- with a clamp.

-- Press the On/Off  button to switch on the Diesel Pressure Tester Kit VAS 6551.

-- Make sure that the drain valve -C- on the Diesel Pressure Tester Kit VAS 6551 -1- is closed.

Fig 3: Identifying Shut-Off Valves A And B On Pressure Tester Kit
GWWN20-11041Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- The shut-off valves -A- and -B- are opened on the Diesel Pressure Tester Kit VAS 6551 -1-.

-- Connect the Vehicle Diagnostic Tester. 

-- Select Guided Function 01 activate fuel pump  .

-- Select check fuel pump delivery pressure/delivery  .

-- Follow the instructions given by the Vehicle Diagnostic Tester.

NOTE: The fuel pump is activated.

-- Read the fuel pressure in the Diesel Pressure Tester Kit VAS 6551:

If the specification is not obtained:

-- Check the fuel lines inside the engine compartment for possible bends, blockages and damage.

-- Check the fuel lines inside the engine compartment for leaks.

If no faults are detected:

Check the fuel pressure in front of the fuel filter as follows.

Check the fuel pressure in front of the fuel filter:

-- Remove the supply line -B- and wipe up the draining fuel with a cleaning cloth. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 4: Identifying Fuel Line Couplers
GWWN10-10526Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
WARNING:

Fuel lines are under pressure.

Danger of personal injury to eyes and skin.

Wear protective eyewear and protective clothing in order to avoid injury and contact with the skin. Wrap a cloth around the connection before loosening hose connections. Open the connection carefully and release the pressure.

-- Connect the Diesel Pressure Tester Kit - Hose 2 VAS 6551/2 between the fuel supply line from the fuel tank and the connection -B- on the Diesel Pressure Tester Kit VAS 6551.

Fig 5: Identifying Diesel Pressure Tester Kit - Hose 2
GWWN20-11021Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Connect the Diesel Pressure Tester Kit - Hose 1 VAS 6551/1 between the connection -A- on the Diesel Pressure Tester Kit VAS 6551 and the fuel line -1- to the fuel filter.

-- Press the On/Off  button to switch on the Diesel Pressure Tester Kit VAS 6551.

-- Make sure that the drain valve -C- on the Diesel Pressure Tester Kit VAS 6551 -1- is closed.

Fig 6: Identifying Shut-Off Valves A And B On Pressure Tester Kit
GWWN20-11041Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- The shut-off valves -A- and -B- are opened on the Diesel Pressure Tester Kit VAS 6551 -1-.

-- Repeat check fuel pump delivery pressure/delivery  , refer to FUEL PRESSURE, CHECKING ENGINE CODES CVCA .

If the specification is now obtained:

Check and fuel filter and replace it, if necessary. Refer to FUEL FILTER, REMOVING AND INSTALLING .

If the specification is not obtained:

Proceed as follows to check the fuel pressure at the fuel delivery unit.

Check the fuel pressure on the fuel delivery unit:

-- Remove the rear bench seat. Refer to REMOVAL AND INSTALLATION .

-- Unclip the cover -1- at the tabs -arrows- using the Trim Removal Wedge 3409.

Fig 7: Identifying Right Cover
GWWA20-10835Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
WARNING: Remember, the fuel pump will turn on when a door is opened, if the battery is connected. Fuel may leak out when the system is open.

-- Remove the fuel return line -1- from the locking flange. Disconnect the connector couplings. Refer to CONNECTOR COUPLINGS, SEPARATING .

Fig 8: Identifying Position Of Fuel Delivery Unit Flange
GWWN20-10044Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
WARNING:

Fuel lines are under pressure.

Danger of personal injury to eyes and skin.

Wear protective eyewear and protective clothing in order to avoid injury and contact with the skin. Wrap a cloth around the connection before loosening hose connections. Open the connection carefully and release the pressure.

-- Connect the Diesel Pressure Tester Kit - Hose 1 VAS 6551/1 between the Diesel Pressure Tester Kit VAS 6551 and the fuel supply line to the fuel filter.

-- Connect the Diesel Pressure Tester Kit - Hose 2 VAS 6551/2 between the Diesel Pressure Tester Kit VAS 6551 and the fuel delivery unit.

-- Make sure that the drain valve -C- on the Diesel Pressure Tester Kit VAS 6551 -1- is closed.

Fig 9: Identifying Shut-Off Valves A And B On Pressure Tester Kit
GWWN20-11041Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- The shut-off valves -A- and -B- are opened on the Diesel Pressure Tester Kit VAS 6551 -1-.

-- Repeat check fuel pump delivery pressure/delivery  , refer to FUEL PRESSURE, CHECKING ENGINE CODES CVCA .

If specified value is achieved:

-- Check the fuel lines to the engine compartment for possible bends, blockages and damage.

-- Check fuel lines for leaks.

If the specification is not obtained:

-- Remove the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .

-- Check the filter screen for dirt.

-- Check to make sure that all wires are connected properly.

-- Pull on the connections to make sure they are secure.

-- Make sure all the hoses are connected -arrows-.

Fig 10: Identifying Delivery Unit Fuel Hoses
GWWN20-10452Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

If no fault was detected:

NOTE: If the filter screen is not blocked or dirty, all lines are connected and the fuel pressure specified value is not reached, then the fuel delivery unit is faulty.

-- Replace the fuel delivery unit. Refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .

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