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: |
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Connect diagnosis cable connector -2-
to diagnostic connection in driver footwell. |
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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: |
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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-. |
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Do not detach cover completely from floor covering in order
to ensure it is reinstalled in the correct installation
position. |
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Detach it just enough that the cover can be folded upwards. |
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Fold up cover in -direction of arrow-. |
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Remove rear bench seat
→ General body repairs, interior; Rep. gr.72. |
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| Continuation for all vehicles: |
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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. |
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If connector was not inserted correctly, repeat final
control diagnosis of fuel pump. |
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Release and pull off connector -arrow-. |
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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. |
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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.
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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. |
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To do this, open clip at bottom. |
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Carefully pull out fuel line -2-. |
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| Continuation for all vehicles: |
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Open locking ring using wrench -T10202-. |
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Check that electrical wires between flange and fuel pump are
connected. |
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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:
Folding the front passenger seat backrest forwards
Fig. 55 Folding the front passenger seat
backrest forwards
Fig. 56 Unlatching the folding front passenger
seat backrest
First read and observe the introductory information
and safety warnings The front passenger seat backrest can be folded forwards
to a horizontal position.
The front ...
Hot air blower, 220 V / 50 Hz -VAS 1978/14-
Caution
When shrink-fitting, take care not to damage any
other wiring, plastic parts or insulating material with
the hot air blower.
Observe the operating instructions of the hot ai ...
Checking the coolant level and refilling coolant
Fig. 195 In the engine compartment: mark
on the coolant expansion tank
Fig. 196 In the engine compartment: coolant
expansion tank cap
First read and observe the introductory information
and safety warnings The warning lamp for the engine coolant will light up
if the engine coolant leve ...
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Checking operation and power supply of fuel pump
Checking fuel pressure