Volkswagen Golf Service & Repair Manual: Checking fuel delivery rate, engine code CWVA
| Special tools and workshop equipment required |
| Remote control for V.A.G. 1348 -V.A.G 1348/3A- |
| Multimeter e.g. hand-held multimeter -V.A.G 1526E- |
| Test instrument adapter/DSO (5-pin) -VAS 5565- |
| Pressure tester -VAS 6550- |
| Vehicle diagnostic tester |
| Connector cable -VAS 6550/3-3- |
| Connector cable -VAS 6550/3-4- |
| Pressure relief valve -VAS 6550/4- |
| Measuring container, capacity ≥ 3 l |
| Auxiliary measuring set -V.A.G 1594C- |
| Carry out the following work: |
| Checking fuel delivery rate in engine compartment, quick
test: |
 Note
| The fuel delivery rate must first be checked in the engine
compartment with the help of the function “Checking fuel
delivery rate, quick test”. If the minimum delivery rate is not
achieved, a 2nd measurement must be carried out at the flange of
the fuel delivery unit. |
| – |
Connect vehicle diagnostic tester. |
| – |
Start Guided Functions. |
| – |
Select the function Checking fuel delivery rate, quick test. |
| – |
Follow instructions on vehicle diagnostic tester. |
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| 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. |
| Proceed as follows to check fuel delivery rate at fuel
delivery unit: |
| Checking fuel delivery rate at fuel delivery unit: |
Note
| Separate plug-in connectors
→ Chapter. |
| When driving characteristic problems occur when the fuel
tank is a approx. 1/4
filled, then check fuel delivery rates with approx.
1/4
filled tank or less. |
| Voltage supply OK
→ Chapter. |
| Fuel pressure OK
→ Chapter. |
| Battery voltage must be at least 11.5 V. If necessary,
connect battery charger
→ Electrical system; Rep. gr.27. |
| 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. |
| – |
Remove right rear seat
→ General body repairs, interior; Rep. gr.72. |
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| – |
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-. |
| – |
Remove rear bench seat
→ General body repairs, interior; Rep. gr.72. |
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| Continuation for all vehicles: |
| – |
Unclip cover -1- for flange at
retaining tabs -arrows-, using
removal wedge -3409-. |
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|
| – |
Unclip sealing grommet -1-
downwards from cover -2-. |
| – |
Push cover -2- back along
wiring harness -3-. |
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|
| – |
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. |
|
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|
| – |
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. |
|
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| – |
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. |
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| – |
Pull fuel line -1- off flange.
Separate plug-in connectors
→ Chapter. |
The fuel system is pressurised.Risk of injury due to fuel which may
spurt out.Wear eye protection.Wear protective gloves.Release pressure:
place clean cloth around connection and carefully open connection. |
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| – |
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. |
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| – |
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-. |
Note
| The fuel system pressurisation pump -G6- will be actuated. |
|
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| – |
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. |
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| – |
Compare delivered quantity of fuel with specification
indicated in chart. |
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| Name of axis |
Unit |
| Minimum delivery rate |
cm3 |
| Voltage at fuel pump with
engine not running and pump running. |
Volt |
| During the test a voltage of 10.5 volts is measured. This
equates to a minimum delivery rate of approx. 1,200 cm3
in 60 seconds. |
| 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. |
|
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|
| – |
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. |
| – |
Renew fuel delivery unit
→ Chapter. |
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Special tools and workshop equipment required
Removal wedge -3409-
Remote control for V.A.G. 1348 -V.A.G 1348/3A-
Multimeter e.g. hand-h ...
Special tools and workshop equipment required
Removal wedge -3409-
Remote control for V.A.G. 1348 -V.A.G 1348/3A-
Multimeter e.g. hand-h ...
Other materials:
Sanding
Avoid sanding through to substrate
–
It is recommended to carefully sand the marked area by hand
to avoid “sanding through” the cathodic dip primer.
Seam seals
S ...
Electrical components
some point, you have probably received an electric shock
when touching a metal object. This is due to the electrostatic
charge accumulated by the human body. This charge can cause
malfunctions if you touch the electric steering rack and
steering column c ...
Changing headlights over from driving on right to driving on left (gas
discharge headlights)
If a right-hand drive vehicle is driven in a left-hand drive
country, or vice versa, the headlights must be converted. This
is necessary in order to avoid dazzling oncoming traffic with
the asymmetric low beam headlights.
Note
...
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Checking fuel delivery rate
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