Checking voltage supply and current consumption of fuel system pressurisation pump G6, engine codes CFHC, CFHF, CLCA — AUDI

🧭 Before you start

Fits: VW Caddy IV (SA, 2015–2020)

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

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• Switch on ignition (2nd mechanic). The fuel pump must be heard to run for about 2 seconds.
• To check the voltage, the engine has to be started or the delivery unit has to be actuated via the tester.
• The fuel pump is now activated for 30 seconds.
• Pickup clamp of hand-held multimeterV.A.G 1715 can also be connected to red terminal with lettering "“pickup clamp”" of test instrument adapter/DSO (5-pin)VAS 5565.

🔧 Engine codes this applies to

📐 39 workshop diagrams for CAYD

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Separate connector (A) to supplementary fuel pump V393.
2. Raise vehicle.
3. Switch on ignition (2nd mechanic). The fuel pump must be heard to run for about 2 seconds.
4. Connect vehicle diagnostic tester, and carry out guided function "“Check electrical fuel pump(s)”". [Note: To check the voltage, the engine has to be started or the delivery unit has to be actuated via the tester.]
5. If fuel pump does not start, lower fuel tank.

6. Pull connector off fuel delivery unit flange.
7. Connect test instrument adapter/DSO (5-pin)VAS 5565 between connector and flange.
8. Connect hand-held multimeterV.A.G 1526D to contacts (1) and (5) of adapter.
9. Connect vehicle diagnostic tester, and carry out guided function "“Check electrical fuel pump(s)”". [Note: The fuel pump is now activated for 30 seconds.]
10. Read voltage value on hand-held multimeterV.A.G 1526D: specification = approx. battery voltage.
11. Check activation of fuel pump relay and wiring for an open or short circuit .
12. Remove fuel delivery unit.
13. Check that the electrical lines between flange and fuel pump are connected and have continuity.
14. Renew fuel delivery unit . [Note: The battery voltage and the diesel fuel temperature have a great influence on the current draw of the fuel pump. For this reason make sure that the battery voltage is at least 12 V whilst checking and the diesel fuel temperature does not fall to the freezing point.]
15. Lower fuel tank.
16. Release connector (arrow) and pull it off flange (1).
17. Connect test instrument adapter/DSO (5-pin)VAS 5565 to connector and fuel delivery unit.
18. Connect pick-up clamp (A) to red terminal with lettering "“pick-up clamp”" for test instrument adapter/DSO (5-pin)VAS 5565. [Note: Pickup clamp of hand-held multimeterV.A.G 1715 can also be connected to red terminal with lettering "“pickup clamp”" of test instrument adapter/DSO (5-pin)VAS 5565.]
19. Separate connector (A) to supplementary fuel pump V393.
20. Switch ignition on.
21. Connect vehicle diagnostic tester, and carry out guided function "“Check electrical fuel pump(s)”". [Note: The fuel pump is now activated for 30 seconds.]
22. Read current draw on hand-held multimeterV.A.G 1526D. Specification: max. 7.5 amps.
23. If the measured value is not within specifications:
24. Renew fuel delivery unit.

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