Volkswagen Golf Service & Repair Manual: Checking function and voltage supply of the fuel pump, engine code CWVA
| Special tools and workshop equipment
required |
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| Multimeter e.g. hand-held multimeter -V.A.G 1526E- |
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| Auxiliary measuring set -V.A.G 1594C- |
| Vehicle diagnostic tester |
| Battery voltage must be at least 11.5 V. If necessary,
charge battery
→ Electrical system; Rep. gr.27. |
| Fuses OK. → Current
flow diagrams, Electrical fault finding and Fitting locations |
 Note
| Function of fuel pump is checked using final control
diagnosis. |
| – |
Observe safety precautions
→ Chapter. |
| – |
Observe rules for cleanliness
→ Chapter. |
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| – |
Connect vehicle diagnostic tester-1-
as follows: |
| – |
Connect diagnosis cable connector -2-
to diagnostic connection in driver footwell. |
| – |
Select final control diagnosis for fuel pump in vehicle
self-diagnosis program. |
| The fuel pump must now run slowly up to maximum speed. |
Note
| The fuel pump runs very quietly. |
| If the final control diagnosis is to be carried out several
times in succession, it may be necessary to start the engine
briefly before repeating the final control diagnosis. |
| If fuel pump does not run: |
| – |
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. |
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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 on
right at retaining tabs -arrows-,
using removal wedge -3409-. |
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| – |
Unclip sealing grommet -1-
downwards from cover -2-. |
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Push cover -2- back along
wiring harness -3-. |
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| – |
Check that connector -arrow- is
fitted securely by pulling connector without pressing catch. |
| – |
If connector was not inserted correctly, repeat final
control diagnosis of fuel pump. |
| – |
Release and pull off connector -arrow-. |
| – |
Check contacts on plug and on fuel delivery unit for damage. |
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| – |
Connect test instrument/DSO adapter (5-pin) -VAS 5565- to
connector and fuel delivery unit. |
| – |
Connect multimeter to cables -1-
and -5- of test instrument
adapter/DSO (5-pin) -VAS 5565-. |
| Specification: approx. battery voltage |
| If the specification is not attained: |
| – |
Locate and eliminate open circuit referring to current flow
diagram → Current
flow diagrams, Electrical fault finding and Fitting locations. |
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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.
| – |
Draining fuel tank
→ Chapter |
| – |
Pull fuel line -1- off flange.
Separate plug-in connectors
→ Chapter. |
| Vehicles with auxiliary heater: |
| – |
Remove fuel line -2- leading to
metering pump -V54- for auxiliary heater from sealing flange. |
| – |
To do this, open clip at bottom. |
| – |
Carefully pull out fuel line -2-. |
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| Continuation for all vehicles: |
| – |
Open locking ring using wrench -T10202-. |
| – |
Check that electrical wires between flange and fuel pump are
connected. |
| – |
Check contacts for damage. |
| If no open circuit can be found: |
| – |
Fuel pump is defective, renew fuel delivery unit
→ Chapter. |
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Special tools and workshop equipment
required
Removal wedge -3409-
...
Special tools and workshop equipment required
Removal wedge -3409-
Pressure tester -VAS 6550-
Connector cable -VAS 6550/3-3-
...
Other materials:
Renewing left oil seal
Special tools and workshop equipment
required
Multipurpose tool -VW 771-
Thrust piece -3305-
...
Correct Driving Position
The seat, head support, seat belt and airbags work
together to maximize your safety. Using these correctly
ensures greater protection.
Position the seat so you can wear the seat belt correctly,
while being as far away from the front airbag as
possible:
1. Sit upright with both feet on the floor ...
Assembly overview - impact bar
1 -
Impact bar
2 -
Guide bracket
Left and right
3 -
Hexagon nut
Qty. 2 on each side
2.0 Nm
4 -
Bolt
Qty. 2 on each side
8 Nm
5 -
Bolt ...
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Checking operation and power supply of fuel pump
Checking fuel pressure