Removing and installing turbocharger 1 control unit J724 - vehicles with two turbochargers, manual mode — AUDI

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018)

• Special tools named: VAS 6395

Don't miss

• Observe rules for cleanliness .
• In this example, software version Hella (item 1) is selected.
• Do NOT unscrew any of the other bolts visible in the illustration.
• Centring pin on bracket VAS 6395 /7 must engage in hole in bracket for turbocharger 1 control unit J724.
• If the control unit stops moving during this process, assist it by pushing gently with your finger (arrow).

🔧 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. If there is no recess, modify retainer VAS 6395 /7 as shown in illustration (B). [Note: Observe rules for cleanliness .]
2. Remove engine cover panel .
3. Remove plenum chamber partition panel General body repairs, exterior50Bulkhead; Removing and installing plenum chamber partition panel.
4. Release cover (3) and swivel to side (arrow).
5. Connect testerVAS 6395 to positive terminal (2) and earth (1) with connection leadVAS 6395/2. [Note: The following procedure is described for using testerVAS 6395 /1/VAS 6395 A/1.Depending on the equipment and tools available in your workshop, testerVAS 6395 B/1 may also be used.Although the buttons are arranged in different positions, the designations/functions are the same (see illustration).]

6. Select software version SW Hella using buttons ↑(item 5) and ↓(item 6).
7. To confirm software version, press v button (item 4). [Note: In this example, software version Hella (item 1) is selected.] [Note: German market: If this is the case, download the correct software version ("“Hella”") from the "“Audi Partner Portal (under Service)”" in the section "“Workshop Equipment”".Rest of the world: If this is the case, download the correct software version ("“Hella”") from your Importer's information platform.]
8. ⚠ 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.
9. Connect connection leadVAS 6395/2 to turbocharger 1 control unit J724 and to testerVAS 6395.
10. Press ↓ button (item 6) twice to select MANUAL mode.
11. Confirm MANUAL mode by pressing v button (item 4).
12. Remove bolt (1). [Note: Do NOT unscrew any of the other bolts visible in the illustration.]
13. Fit bracket VAS 6395 /7 on centring hole of bracket for turbocharger 1 control unit J724 and tighten (bolt) to 7 Nm. [Note: Centring pin on bracket VAS 6395 /7 must engage in hole in bracket for turbocharger 1 control unit J724.] — 7 Nm (5.2 lb-ft)
14. Press ↑ button (item 5) on VAS 6395 to move coupling rod (1) onto bracket VAS 6395 /7. [Note: If the control unit stops moving during this process, assist it by pushing gently with your finger (arrow).]
15. Note down voltage value (1).
16. Press ↓ button (item 6) on VAS 6395 to move coupling rod (1) back off bracket VAS 6395 /7.
17. Repeat process for determining voltage value two more times and note down voltage values. [Note: If it is necessary to assist the control unit by pushing the coupling rod (3) with your finger in order to determine the voltage value, you must do this each time the process is repeated (try to apply the same amount of pressure) (arrow).]
18. Calculate average of 3 recorded voltage values.
19. Unclip securing clip.
20. Disengage coupling rod (4) at turbocharger 1 control unit J724 and lay coupling rod down.
21. ⚠ Do not bend coupling rod. — Remove bolts (1, 2, 3) and dispose of them. [Note: Do NOT unscrew any of the other bolts visible in the illustration.]
22. Remove old turbocharger 1 control unit J724 and dispose of it.
23. Install new turbocharger 1 control unit J724 in reverse sequence of removal. [Note: Only exchange the coupling rod from the replacement part kit if necessary (e.g. due to damage).]
24. Fit new bolts (1, 2, 3), M6x15 with tapered shank:
25. Initially hand-tighten bolts.
26. Connect connecting wireVAS 6395/2 with adapter to new turbocharger 1 control unit J724.
27. Set new turbocharger 1 control unit J724 to a value 0.020 - 0.030V higher than value calculated previously.
28. Insert coupling rod (3).
29. Attach securing clip (2).
30. Now turn turbocharger 1 control unit J724 so that arm (1) rests against bracket VAS 6395 /7.
31. Tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
32. ⚠ Setting the turbocharger 1 control unit J724 incorrectly can lead to problems with noise and/or poor driveability. — Press ↑ button (item 5) on VAS 6395 to move coupling rod (3) onto bracket VAS 6395 /7.
33. Compare voltage value (1) with calculated average. [Note: The voltage of the new turbocharger 1 control unit must not differ from the average value for the old control unit by more than +/- 0.020V.]
34. Press ↓ button (item 6) on VAS 6395 to move coupling rod (3) back off bracket VAS 6395 /7.
35. Loosen bolts (1, 2, 3) just enough so that turbocharger 1 control unit J724 can be moved by applying light force.
36. Push turbocharger 1 control unit in appropriate direction and tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
37. Press ↑ button (item 5) on VAS 6395 to move coupling rod (3) onto bracket VAS 6395 /7.
38. Compare voltage value (1) with calculated average.
39. Press ↓ button (item 6) on VAS 6395 to move coupling rod (3) back off bracket VAS 6395 /7.
40. Re-adjust turbocharger 1 control unit J724.
41. Tighten bolts (1, 2, 3) to 10 Nm. — 10 Nm (7.4 lb-ft)
42. Check voltage value again.
43. Re-adjust turbocharger 1 control unit J724.
44. Remove bolt (arrow) and detach bracket VAS 6395 /7.
45. Screw bolt back in and tighten .
46. Unplug electrical connectors for testerVAS 6395.

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