Volkswagen Golf Service & Repair Manual: Checking holding pressure, engine code CWVA
| Special tools and workshop equipment required |
| Pressure tester -VAS 6550- |
| Connector cable -VAS 6550/3-3- |
| Connector cable -VAS 6550/3-4- |
| Vehicle diagnostic tester |
| – |
Observe safety precautions
→ Chapter. |
| – |
Observe rules for cleanliness
→ Chapter. |
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Pull off supply line -1-.
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.
| – |
Collect escaping fuel with a cleaning cloth. |
| Fuel pressure OK and pressure tester -VAS 6550- connected.
Check fuel pressure
→ Chapter. |
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| – |
Connect fuel line from fuel tank to shut-off tap
-B- of pressure tester -VAS 6550-
by means of hose -VAS 6550/2-. |
| – |
Connect fuel line leading to engine
-1- to shut-off tap -A- of
pressure tester -VAS 6550- by means of hose -VAS 6550/1-. |
| – |
Connect vehicle diagnostic tester. |
| – |
Select final control diagnosis for fuel pump in vehicle
self-diagnosis program. |
 Note
| The fuel pump is now actuated to build up fuel pressure. |
| 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. |
| – |
Read off fuel pressure on pressure gauge. |
| Specification: ≥ 4.0 bar. |
| – |
End self-diagnosis and switch off ignition. |
| – |
Observe pressure drop on pressure gauge. After 10 minutes,
the pressure must not drop by more than 1.0 bar. |
| – |
Check all fuel lines for leaks and damage. |
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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. |
| – |
Actuate fuel pump with final control diagnosis to build up
fuel pressure. |
| – |
After pressure has built up, close shut-off valve
-A- of pressure tester immediately.
Lever is then at right angle to direction of flow. |
| If the pressure now drops (leak on fuel tank side): |
| Proceed as follows to check residual pressure on fuel
delivery unit
→ Anchor. |
| If the pressure does not drop now (leak on engine side): |
Note
| Search for leak on engine side. Repeat holding pressure
check. This time, close shut-off valve -B-
to check whether leak actually is on engine side. |
| If there is a leak on engine side: |
| – |
Check surfaces of fuel lines for leaks. |
| – |
Check surfaces of fuel rail and injectors for leaks
→ Rep. gr.24. |
| – |
Check injectors for leaks
→ Rep. gr.24. |
| Checking holding pressure on fuel
delivery unit: |
| – |
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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| – |
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- to fuel delivery unit
-1- by means of hose -VAS
6550/3-4-. |
| – |
Connect pressure tester -VAS 6550- to fuel line
-2- by means of hose -VAS
6550/3-3-. |
| – |
Ensure plug-in connectors are secured properly by pulling. |
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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. |
| – |
Actuate fuel pump with final control diagnosis to build up
fuel pressure. |
| – |
After pressure has built up, close shut-off tap
-B- of pressure tester immediately.
Lever is then at right angle to direction of flow. |
| – |
Repeat holding pressure check
→ Anchor. |
| If pressure no longer drops: |
| – |
Check fuel line for leaks. |
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| If the pressure drops again: |
| – |
Open fuel delivery unit -1-
→ Chapter. |
| – |
Check that all hose connections
-arrows- are connected. |
| – |
Check fuel lines for leaks and damage. |
| – |
Pressure retention valve in fuel delivery unit is defective;
renew fuel delivery unit
→ Chapter. |
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Special tools and workshop equipment required
Pressure tester -VAS 6550-
Removal wedge -3409-
Connector cable -VAS 6550/3-3-
...
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:
Tyre monitoring display
First read and observe the introductory information
and safety warnings The tyre monitor display uses the ABS sensors to compare
the rolling circumference and the vibration characteristics of the individual wheels.
Any change in the tyre pressure of one or more wheels is shown by the tyre mo ...
Removing and installing reversing camera -R189-
Reversing camera and swivel motor are each installed in
individual housings together in swivel badge of rear lid. To
remove camera housing, remove first both components together
with swivel badge from rear lid. Afterwards, camera housing
together with sw ...
Warning and indicator lamps
The warning and indicator lamps indicate various warnings , faults or certain
functions. Some warning and indicator lamps light up when the ignition is switched
on and should go out once the engine is running or the vehicle is in motion.
Depending on the vehicle equipment level, additio ...
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Checking holding pressure
Checking fuel delivery rate