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

🧭 Before you start

Fits: VW Golf VI (5K, 2008–2013); platform code 521

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

Don't miss

• Do not cant wrench T10202 and press against locking ring firmly. If the wrench slips off, the fuel delivery unit can be damaged. — Check that electrical wires between flange and fuel pump are connected.

🔧 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 on Vehicle diagnostic tester. [Note: Function of fuel pump is checked using final control diagnosis.The fuel pump is now activated.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 for sealing flange on right at retaining tabs (arrows) using removal wedge3409.
10. Check that connector (arrow) is fitted securely by pulling connector without pressing catch.
11. If connector was not inserted correctly, repeat functional check of fuel pump.
12. Release and unplug connector (arrow).
13. Check contacts on plug and on fuel delivery unit for damage.
14. Connect test instrument/DSO adapter (5-pin)VAS 5565 to connector and fuel delivery unit.
15. Connect multimeter to cables (1) and (5) of test instrument adapter/DSO (5-pin)VAS 5565.
16. Repeat functional check of fuel pump .
17. Locate and eliminate open circuit referring to current flow diagram .
18. Pull fuel lines (1) and (2) off flange. Separate plug-in connectors .
19. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — On vehicles with auxiliary heater the connector and the fuel line of the metering pump V54 must also be separated.
20. Draining fuel tank
21. Open locking ring using wrench T10202.
22. ⚠ Do not cant wrench T10202 and press against locking ring firmly. If the wrench slips off, the fuel delivery unit can be damaged. — 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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