Checking fuel pump relay J17 and activation - vehicles with 8-cylinder engine — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

Don't miss

• Connect adapterV.A.G 1598/30 to connectors of wiring harness for diesel direct injection system control unit J248 (do not connect control unit) 23.

🔧 Engine codes this applies to

📐 60 workshop diagrams for AFB

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

📋 Procedure

1. Observe test conditions .
2. Release ashtray from centre console by pressing small lever (arrow).
3. Take out ashtray and remove cover for diagnostic connector.
4. With ignition switched off, connect vehicle diagnostic, testing and information systemVAS 5051B.
5. With ignition switched off, connect vehicle diagnostic, testing and information systemVAS 5051B.

6. Switch on ignition.
7. Select Vehicle self-diagnosis from the list (item 1).
8. From menu (1), select vehicle system "“01 - Engine electronics”" and press → key to continue.
9. From menu (1), select diagnostic function "“Final control diagnosis”" and press → key to continue.
10. Press → key repeatedly until fuel pump relay J17 is activated.
11. If fuel system pressurisation pump G6 is not activated, take out floor covering in front right footwell.
12. Remove bolts (arrows) and detach cover for electronics box.
13. Pull auxiliary relay carrier out of guide rails (arrows 2) on both sides.
14. Take auxiliary relay carrier out of electronics box.
15. Operate starter.
16. Check voltage supply of fuel pump relay J17.
17. Check activation wiring of fuel pump relay J17.
18. Check activation of fuel pump .
19. Check fuel system pressurisation pump G6 (electrical test) .
20. Detach fuel pump relay J17 (located on auxiliary relay carrier in electronics box in passenger's footwell, position (2)).
21. Connect voltage testerV.A.G 1527B as follows:
22. Switch on ignition.
23. If LED does not light up, remove terminal 30 voltage supply relay J317(arrow) from position "“4”" in micro central electrics.
24. Check for open circuit and short to positive or earth in the following wiring:
25. Repair wiring connection if necessary .
26. Connect adapterV.A.G 1598/30 to connectors of wiring harness for diesel direct injection system control unit J248 (do not connect control unit) 23.
27. Check for open circuit and short to positive or earth in the following wiring:
28. Repair wiring connection if necessary .
29. Remove knurled screw (1).
30. Pull trim (2) to rear out of fastener (3) and detach.
31. Pull out fuse in fuse holder S1 from fuse carrier (blue) (ST4).
32. Connect hand-held multimeterV.A.G 1526C (voltage measurement range) to earth and top fuse contact.
33. Briefly operate starter.
34. If specification is not attained, check wiring connection Current flow diagrams, Electrical fault finding and Fitting locations.
35. Renew fuel pump relay J17 if wiring and all previous checks are OK.

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