Removing and installing turbocharger 1 control unit J724 - vehicles with 2.7 ltr. engine — AUDI

🧭 Before you start

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

• Renewed: bolts as follows

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. >TEST2. LEARNIf this is the case, download the correct software version from the "„Audi ServiceNet“" under "„Workshop Equipment“".
• If the display indicates "„[OK
• The stop plateVAS 6395/3 must not be loosened until the work sequence has been completed. — To continue, press v button (item 4).
• If the display indicates "„FAULT [OK

🔧 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.

📐 20 workshop diagrams for ASB

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

📋 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. >TEST2. LEARNIf 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 6395/2 to turbocharger 1 control unit J724 and to testerVAS 6395/1.

6. To continue, press v button (item 4). [Note: If the display indicates "„[OK]“", the adjustment range of the turbocharger 1 control unit J724 is stored.If the display shows "„FAULT [OK]“", tap gently several times on the housing of turbocharger 1 control unit J724 with the handle of a screwdriver and repeat the check by pressing v button (item 4).]
7. Unclip retaining clip (1) and move electrical wire clear.
8. Secure stop plateVAS 6395/3 with bolts for heat shield. Tightening torque: 8 Nm. — 8 Nm (5.9 lb-ft)
9. ⚠ The stop plateVAS 6395/3 must not be loosened until the work sequence has been completed. — To continue, press v button (item 4).
10. While the voltage value is being determined, keep tapping gently on the housing of turbocharger 1 control unit J724 until the display indicates the following:
11. Note voltage value. [Note: If the display indicates "„FAULT [OK]“" or the voltage is less than 3.3 V or greater than 3.7 V, unplug testerVAS 6395/1 and repeat the complete procedure .]
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 circlips (arrows) and dispose of them, detach coupling rod.
14. By pressing buttons ↑(item 5) and ↓(item 6), adjust turbocharger 1 control unit J724 so that bolts for J724 can be accessed easily.
15. Disconnect connection leadVAS 6395/2 from turbocharger 1 control unit J724.
16. ⚠ Power supply for testerVAS 6395/1 must remain connected. — Remove bolts (1, 2, 3) and dispose of them.
17. Remove old turbocharger 1 control unit J724 and dispose of it.
18. ⚠ Check that the three insulating washers are fitted between turbocharger 1 control unit J724 and the bracket. — Install new turbocharger 1 control unit J724 in reverse sequence of removal.
19. Fit new bolts as follows:
20. Initially hand-tighten bolts.
21. Connect connection leadVAS 6395/2 to new turbocharger 1 control unit J724.
22. To continue, press v button (item 4).
23. Select menu item "„NEXT“" with ↓ button (item 6).
24. To continue, press v button (item 4). [Note: If the display indicates "„CHECK“", the adjustment range of the new turbocharger 1 control unit J724 must be checked .If the display indicates "„FAULT“", the new turbocharger 1 control unit J724 must be renewed for a second time.]
25. To continue, press v button (item 4).
26. To continue, press v button (item 4).
27. Insert coupling rod.
28. Fit circlips (arrows).
29. Press turbocharger 1 control unit J724 towards the rear without applying force (arrow) until lever (1) rests lightly on stop plateVAS 6395/3.
30. Hold J724 in this position.
31. Tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
32. To continue, press v button (item 4). [Note: If [OK] is indicated on display, terminate adjustment .If "„CHECK“" is indicated on display, proceed as follows.]
33. Loosen bolts (1, 2, 3) until turbocharger 1 control unit J724 can just be moved by applying light force in the direction stated:
34. Tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
35. To continue, press v button (item 4).
36. Tighten bolts (1, 2, 3) to 10 Nm. — 10 Nm (7.4 lb-ft)
37. To continue, press v button (item 4).
38. Remove stop plateVAS 6395/3.
39. Secure electrical wiring with retaining clip (1).
40. To continue, press v button (item 4). [Note: If the display indicates "„FAULT“", the new turbocharger 1 control unit J724 must be renewed .]
41. Unplug electrical connectors for testerVAS 6395/1.

Other AUDI procedures

• Removing and installing air filter element – Audi
• Removing cylinder head - vehicles from 09.2005 onwards – Audi
• Removing and installing mechanical exhaust gas recirculation valve
• Checking fuel pressure regulating valve N276
• Cylinder head cover - exploded view · 1 torque figures
• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures