Checking function and voltage supply (engine codes CBTA, CBUA, BGP, BGQ) — VW

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code 5M1

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

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• On vehicles with auxiliary heater the connector and the fuel line of the metering pump V54 must also be separated.

🔧 Engine codes this applies to

📋 Procedure

1. Connect vehicle diagnosis tester as follows:
2. Push diagnosis cable connector onto diagnosis connection in driver footwell.
3. Switch on ignition.
4. Press buttons on display one after the other for Vehicle self-diagnosis, Engine electronics and Final control diagnosis.
5. Press right arrow button ► on display to initiate actuation of fuel pump.

6. Switch off ignition.
7. Remove bench seat General body repairs, interior72Rear seats; Removing and installing bench seat.
8. Remove cover from fuel delivery unit.
9. First check that the connector (arrow) is fitted securely by pulling the connector without pressing the catch. If connector was not inserted correctly, repeat functional check of fuel pump.
10. Now pull off connector.
11. Check the contacts on the connector and on the fuel delivery unit for damage.
12. Connect test instrument adapter/DSO (5-pin)VAS 5565 to connector and fuel delivery unit.
13. Connect multimeterV.A.G 1526D to cables (1) and (5) of test instrument adapter/DSO (5-pin)VAS 5565.
14. Initiate final control diagnosis again and measure voltage at fuel pump.
15. Locate and eliminate open circuit referring to current flow diagram .
16. ⚠ Fuel supply line is pressurised. Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection. — Pull fuel lines (1) and (2) off flange. Separate push-on couplings . [Note: On vehicles with auxiliary heater the connector and the fuel line of the metering pump V54 must also be separated.]
17. Open locking ring using wrench T10202.
18. Check that electrical wires between flange and fuel pump are connected.
19. Fuel pump defective, renew fuel delivery unit .

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