Removing and installing turbocharger 1 control unit J724 - vehicles with 3.0 ltr. engine — AUDI

🧭 Before you start

Fits: Audi A4 Cabriolet B6/B7 (8H), Audi A4 B6/B7 (8E)

• Special tools named: VAS 6395/4

Don't miss

• The bottom bolt (right arrow) does not have to be completely removed.
• If the following appears on the display, an incorrect software version has been loaded:1. START2. NEXT [>
• Power supply for testerVAS 6395/1 must remain connected. — Unclip retaining clip (1) for electrical wire.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. Carefully pull engine cover panel off four retaining pins one after the other (arrows).
2. Remove bolts (arrows) and detach heat shield for turbocharger. [Note: The bottom bolt (right arrow) does not have to be completely removed.]
3. Connect testerVAS 6395/1 with connecting wireVAS 6395/2 to positive battery terminal (arrow) and negative battery terminal. [Note: If the following appears on the display, an incorrect software version has been loaded:1. START2. NEXT [>]If this is the case, download the correct software version from the "„Audi ServiceNet“" under "„Workshop Equipment“".]
4. ⚠ Risk of damage to turbocharger 1 control unit J724.Before continuing, check whether the correct software version is loaded in the testerVAS 6395/1. To do so, proceed as follows: — Unplug electrical connector for turbocharger 1 control unit J724.
5. Connect connection leadVAS 6395/4-2 to turbocharger 1 control unit J724 and to testerVAS 6395/1.

6. To continue, press v button (item 4).
7. Unplug electrical connectors for testerVAS 6395/1.
8. To do so, proceed as follows:
9. To continue, press v button (item 4).
10. Press ↓ button (item 6).
11. To continue, press v button (item 4).
12. By pressing buttons ↑(item 5) and ↓(item 6), adjust turbocharger 1 control unit J724 so that coupling rod can be accessed easily for removal.
13. Unclip coupling rod (arrows) and dispose of it.
14. To continue, press v button (item 4).
15. Disconnect connection leadVAS 6395/4-2 from turbocharger 1 control unit J724.
16. ⚠ Power supply for testerVAS 6395/1 must remain connected. — Unclip retaining clip (1) for electrical wire.
17. Remove bolts (arrows); use open-end spanner, 10 mm (90 mm long)VAS 6395/4-3 for bolts at centre and bottom.
18. Remove old turbocharger 1 control unit J724 and dispose of it.
19. Install new turbocharger 1 control unit J724 in reverse order of removal, tighten bolts (arrows) only hand-tight.
20. Clip on new coupling rod (arrows).
21. Connect connection leadVAS 6395/4-2 to turbocharger 1 control unit J724.
22. To continue, press v button (item 4).
23. Press turbocharger 1 control unit J724 downwards and towards rear using moderate pressure (arrow A), at the same time tighten bolts (arrows B) to 10 Nm using open-end spanner, 10 mm (90 mm long)VAS 6395/4-3 for centre and bottom bolts. — 10 Nm (7.4 lb-ft)
24. To continue, press v button (item 4).
25. ⚠ Now check correct installation of turbocharger 1 control unit J724; from the next step of the programme onwards (confirmed by the v button (item 4)) the turbocharger 1 control unit J724 learns the limit positions of the adjustment travel once only. If the limit positions are not stored correctly due to an incorrect installation position, the learning procedure of turbocharger 1 control unit J724 cannot be repeated and the control unit must be renewed.If you are not certain that the installation position is correct, you can terminate the procedure by pressing the x button (item 3) and the start the procedure again. — To confirm that the new turbocharger 1 control unit J724 has been correctly installed, press v button (item 4).
26. At the same time, check position of adjustment lever at turbocharger 1 control unit J724:
27. To continue, press v button (item 4).
28. At the same time, check position of adjustment lever at turbocharger 1 control unit J724:
29. To continue, press v button (item 4).
30. To continue, press v button (item 4).
31. To confirm, press v button (item 4).
32. Unplug electrical connectors for testerVAS 6395/1.

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