Checking voltage supply and current consumption of fuel supply pump, vehicles with 6.0 bar low pressure fuel system — AUDI

🧭 Before you start

Fits: VW Caddy IV (SA, 2015–2020)

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

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• 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

📋 Procedure

1. Lower fuel tank .
2. First check that connector (1) is fitted securely, without pressing catch. The connector can cause a fault if it has not been fitted correctly.
3. Release connector (arrow) and pull off from flange of fuel delivery unit (1).
4. Connect test instrument adapter/DSO (5-pin)VAS 5565 between connector and flange.
5. Connect hand-held multimeterV.A.G 1526D to contacts (1) and (5) of adapter.

6. Connect vehicle diagnostic tester, and carry out guided function "“Check electrical fuel pump(s)”". [Note: The fuel pump is now activated for 30 seconds.]
7. Read voltage value on hand-held multimeterV.A.G 1526D: specification = battery voltage (- 0.5 V OK).
8. Check actuation of fuel pump relay and wiring for open circuit and short circuit .
9. Check current consumption of fuel pump. [Note: The battery voltage and the diesel fuel temperature have a great influence on the current draw of the fuel pump. For this reason, measures should be taken to ensure that battery voltage is at least 12.5 V during the check.Depending on the season, make sure that the vehicle is filled with winter diesel if necessary.]
10. First check that connector (arrow) is fitted securely without pressing catch. The connector can cause a fault if it has not been fitted correctly.
11. Release connector (arrow) and pull off from flange of fuel delivery unit.
12. Connect test instrument adapter/DSO (5-pin)VAS 5565 to connector and fuel delivery unit.
13. 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.]
14. Switch ignition on.
15. Connect vehicle diagnostic tester, and carry out guided function "“Check electrical fuel pump(s)”". [Note: The fuel pump is now activated for 30 seconds.]
16. Take current draw reading on hand-held multimeterV.A.G 1526D. Specification: at least 8.0 amperes, no more than 14.0 amperes.
17. Remove fuel delivery unit .
18. Check that the electrical lines between flange and fuel pump are connected and have continuity.
19. Renew fuel delivery unit .

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