Checking secondary air pump relay J299 and actuation — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: V.A.G 1598/31

Don't miss

• Connect test boxV.A.G 1598/22 or V.A.G 1598/31 to wiring harness to engine control unit, but do not connect actual engine control unit 24.

🔧 Engine codes this applies to

📐 28 workshop diagrams for ACK

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

📋 Procedure

1. In list (1) select function "“03 - Final control diagnosis”".
2. Keep touching → key until secondary air pump relay J299 is actuated.
3. Terminate function "“03 - Final control diagnosis”" by touching ← key and switch off ignition.
4. Check power supply of secondary air pump relay J299.
5. Check actuation of secondary air pump relay J299.

6. Check power supply for secondary air pump motor V101.
7. Slacken off cross-head bolts (1) at electronics box in plenum chamber.
8. Unclip plenum chamber cover (2) at front at bulkhead (arrows).
9. Detach plenum chamber cover.
10. Prise out cover (1) in scuttle panel trim and slacken off rear cross-head bolt (rear right arrow).
11. Slacken off the remaining cross-head bolts (arrows).
12. Detach cover for electronics box in plenum chamber.
13. Detach secondary air pump relay J299 at position (4).
14. Connect up multimeter (voltage measuring range) between relay socket, contact (8) and earth.
15. Check secondary air pump fuse S130 (60 A) in right A-pillar fuse carrier.
16. Check for open circuit in wiring from battery + (terminal 30) via secondary air pump fuse S130 (in right A-pillar fuse carrier) to secondary air pump relay J299 (in relay and fuse carrier in plenum chamber electronics box, position 4).
17. Connect up multimeter (voltage measuring range) between relay socket, contact 4 and earth.
18. Briefly operate starter.
19. Use current flow diagram to repair wiring.
20. Switch off ignition.
21. Disconnect secondary air pump relay J299.
22. Connect up voltage testerV.A.G 1527 B between relay socket contact (6) and battery positive.
23. Repeat function "“03 - Final control diagnosis”".
24. Keep touching → key until secondary air pump relay J299 is actuated.
25. Terminate function "“03 - Final control diagnosis”" by touching ← key and switch off ignition.
26. Connect test boxV.A.G 1598/22 or V.A.G 1598/31 to wiring harness to engine control unit, but do not connect actual engine control unit 24.
27. Check for open circuit and short to earth or positive in the following wiring:
28. Repair wiring if necessary.
29. Replace secondary air pump relay J299.
30. Unplug connector at secondary air pump motor V101.
31. Connect up voltage testerV.A.G 1527 B between contacts 1 and 2.
32. Repeat function "“03 - Final control diagnosis”".
33. Keep touching → key until secondary air pump relay J299 is actuated.
34. Terminate function "“03 - Final control diagnosis”" by touching ← key and switch off ignition.
35. Use current flow diagram to check for open circuit in wiring between connector at secondary air pump motor V101 and secondary air pump relay J299, position (4) (in relay and fuse carrier in electronics box in plenum chamber).
36. Use current flow diagram to check for open circuit in wiring between connector at secondary air pump motor V101 and earth.
37. Replace secondary air pump motor V101.

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