Checking function and voltage supply, engine codes CBTA, CBUA, CCCA — VW

🧭 Before you start

Fits: platform codes A32, A33

• Special tools named: VAS 5565
• Renewed: fuel delivery unit

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• 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.

🔧 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. Unclip cover (1) at retaining tabs (arrows) using removal wedge3409.
10. 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.
11. Pull off connector (1).
12. Check contacts on plug and on fuel delivery unit for damage.
13. Connect test instrument adapter/DSO (5-pin)VAS 5565 to connector and fuel delivery unit.
14. Connect hand-held multimeter to contacts (1) and (5) of adaptersVAS 5565.
15. Initiate final control diagnosis again and measure voltage at fuel pump.
16. Locate and eliminate open circuit referring to current flow diagram .
17. Remove fuel delivery unit .
18. Check that electrical wires between flange and fuel pump are connected.
19. Check contacts for damage.
20. Fuel pump is defective, renew fuel delivery unit .

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