Checking fuel delivery rate, engine code CWVA

Auxiliary measuring set -V.A.G 1594C-

Carry out the following work:

Checking fuel delivery rate in engine compartment, quick test:

• Connect vehicle diagnostic tester.
• Start Guided Functions.
• Select the function Checking fuel delivery rate, quick test.
• Follow instructions on vehicle diagnostic tester.

If the specification is not attained:

• Open tank flap unit -2-.
• Clean area around fuel filler neck.
• Unscrew cap -1- for fuel filler neck.
• Check fuel delivery rate, repeat quick test → Anchor.

If specification is attained:

• Check fuel tank breather → Chapter.

If the specification is not attained:

• Check fuel lines for possible restrictions (kinks) or blockages.
• Check fuel lines for leaks and damage.

If no fault is found:

Proceed as follows to check fuel delivery rate at fuel delivery unit:

Checking fuel delivery rate at fuel delivery unit:

Separate plug-in connectors → Chapter.

Voltage supply OK → Chapter.

Fuel pressure OK → Chapter.

Fuel pump control unit -J538- OK → Vehicle diagnostic tester.

• Observe safety precautions → Chapter.
• Observe rules for cleanliness → Chapter.
• Connect battery charger → Electrical system; Rep. gr.27.

Golf SV:

• Remove right rear seat → General body repairs, interior; Rep. gr.72.

• Partially detach cover -1- in floor covering at parting line -arrow-.
• Do not detach cover completely from floor covering in order to ensure it is reinstalled in the correct installation position.
• Detach it just enough that the cover can be folded upwards.
• Fold up cover in -direction of arrow-.

Golf and Golf Estate:

• Remove rear bench seat → General body repairs, interior; Rep. gr.72.

Continuation for all vehicles:

• Unclip cover -1- for flange at retaining tabs -arrows-, using removal wedge -3409-.

• Unclip sealing grommet -1- downwards from cover -2-.
• Push cover -2- back along wiring harness -3-.

• Check that connector -1- is fitted securely by pulling connector without pressing catch. The connector can cause a fault if it has not been fitted correctly.
• Release and pull off connector -1-.
• Check contacts on plug and on fuel delivery unit for damage.

• Connect test instrument adapter/DSO (5-pin) -VAS 5565- to connector and fuel delivery unit.
• Connect remote control -V.A.G 1348/3A- to adapter -VAS 5565- and to battery positive terminal in engine compartment.

Note

This step serves only to have the fuel pump running when the engine is stopped.

• The delivery rate of the fuel pump depends on the battery voltage. Therefore also connect multimeter to contacts -1- and -5- of adapter -VAS 5565-.
• Also use auxiliary measuring set -V.A.G 1594C- for this purpose.

• Pull fuel line -1- off flange. Separate plug-in connectors → Chapter.

• Connect pressure tester -VAS 6550- with hose -VAS 6550/3-4- to fuel delivery unit -1-.
• Connect hose -VAS 6550/3-4- to shut-off tap -A-.
• Connect pressure relief valve -VAS 6550/4- to connection -B- of pressure tester -VAS 6550-
• Hold end of hose of pressure relief valve -VAS 6550/4- in measuring container.

• Ensure that drain tap -C- on pressure tester-1- is closed.
• Shut-off valves -A- and -B- on pressure tester-1- are open.
• Press remote control -V.A.G 1348/3A-.

The fuel system pressurisation pump -G6- will be actuated.

• Set pressure of 4.0 bar on pressure relief valve-arrow- using adjuster wheel.
• Keep the adjuster wheel in this position from this point on.
• Drain measuring container.
• Press remote control for 60 seconds whilst measuring voltage at fuel pump.

• Compare delivered quantity of fuel with specification indicated in chart.

Example:

If specification is attained:

• Check fuel lines for possible restrictions (kinks) or blockages.
• Check fuel lines for leaks and damage.

If the specification is not attained:

• Remove fuel delivery unit → Chapter.

• Check filter strainer for soiling.
• Check that all fuel delivery unit -1- hose connections -arrows- are connected.
• Check fuel lines for possible restrictions (kinks) or blockages.
• Check fuel lines for leaks and damage.

If no fault is detected:

• Renew fuel delivery unit → Chapter.