Checking function and voltage supply, engine codes CDVB, CPKA, CPRA — VW

🧭 Before you start

Fits: platform codes A32, A33

• Renewed: fuel delivery unit

Don't miss

• 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.
• Ensure that connector on fuel pump control unit J538 is fitted securely by pulling connector without pressing catch. If connector was not inserted correctly, repeat functional check of fuel pump.
• Do not cant key T10202 and press against locking ring firmly. If the key slips off, the fuel delivery unit can be damaged.

🔧 Engine codes this applies to

📋 Procedure

1. Observe safety precautions .
2. Observe rules for cleanliness .
3. Connect vehicle diagnostic tester(1) as follows:
4. Connect diagnosis cable connector (2) to diagnostic connection in driver footwell.
5. Switch ignition on.

6. Select final control diagnosis for fuel pump in vehicle self-diagnosis program. [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.]
7. Switch off ignition.
8. Remove bench seat General body repairs, interior72Rear seat; Removing and installing bench seat / individual seats.
9. Ensure that connector on fuel pump control unit J538 is fitted securely by pulling connector without pressing catch. If connector was not inserted correctly, repeat functional check of fuel pump.
10. Pull connector from fuel pump control unit J538.
11. Check contacts on connector and on fuel pump control unit J538 for damage.
12. Check voltage supply between contacts (1) and (6) using hand-held multimeterV.A.G 1526E.
13. Locate and eliminate open circuit referring to current flow diagram .
14. Unclip cover (1) at retaining tabs (arrows) using removal wedge3409.
15. Check that connector (1) is fitted securely by tugging connector without pressing catch. If connector was not inserted correctly, repeat functional check of fuel pump.
16. Pull off connector (1).
17. Check contacts on plug and on fuel delivery unit for damage.
18. Draining fuel tank
19. Pull fuel line (2) off flange of fuel delivery unit (3). Separate plug-in connectors .
20. Open locking ring using wrench T10202.
21. Do not cant key T10202 and press against locking ring firmly. If the key slips off, the fuel delivery unit can be damaged.
22. Check that electrical wires between flange and fuel pump are connected.
23. Check contacts for damage.
24. Fuel pump is defective. Renew fuel delivery unit .

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