Removing and installing turbocharger 1 control unit J724 - vehicles with one turbocharger — AUDI

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018)

• Renewed: bolts as follows

Don't miss

• If the display indicates "“[OK
• Do NOT unscrew any of the other bolts visible in the illustration.
• If the display indicates "“FAULT [OK
• If the display indicates "“FAULT”", the new turbocharger 1 control unit J724 must be renewed for a second time.
• If the display indicates "“FAULT”", the new turbocharger 1 control unit J724 must be renewed .

🔧 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.

📐 1 workshop diagram for CDUC

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

📋 Procedure

1. Remove engine cover panel .
2. Release cover (3) and swivel to side (arrow).
3. Connect testerVAS 6395 A/1 to positive terminal (2) and earth (1) with connection leadVAS 6395/2.
4. Select software version with buttons ↑(item 5) and ↓(item 6).
5. To confirm software version, press v button (item 4). [Note: If the following appears on the display, an incorrect software version has been loaded:1. >TEST2. LEARNGerman market: If this is the case, download the correct software version 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 from your Importer's information platform.]

6. ⚠ 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.
7. Connect connection leadVAS 6395/2 to turbocharger 1 control unit J724 and to testerVAS 6395 A/1.
8. To continue, press v button (item 4). [Note: If the display indicates "“[OK]”", the adjustment range of the turbocharger 1 control unit J724 is OK.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).]
9. Remove bolt (arrow). [Note: Do NOT unscrew any of the other bolts visible in the illustration.]
10. Fit bracketVAS 6395 /6 on centring hole of bracket for turbocharger 1 control unit J724 and tighten bolt to 8 Nm. — 8 Nm (5.9 lb-ft)
11. To continue, press v button (item 4).
12. 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:
13. 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 A/1 and repeat the complete procedure .The turbocharger must be renewed if no voltage value can be read out.]
14. By pressing buttons ↑(item 5) and ↓(item 6), adjust turbocharger 1 control unit J724 so that coupling rod can be accessed easily for removal.
15. Unclip circlips (arrows) and dispose of them, detach coupling rod.
16. By pressing buttons ↑(item 5) and ↓(item 6), adjust turbocharger 1 control unit J724 so that bolts for J724 can be accessed easily.
17. Disconnect connection leadVAS 6395/2 from turbocharger 1 control unit J724.
18. ⚠ Power supply for testerVAS 6395 A/1 must remain connected. — Remove bolts (1, 2, 3) and dispose of them. [Note: Do NOT unscrew any of the other bolts visible in the illustration.]
19. Remove old turbocharger 1 control unit J724 and dispose of it.
20. ⚠ 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.
21. Fit new bolts as follows:
22. Initially hand-tighten bolts.
23. Connect connection leadVAS 6395/2 to new turbocharger 1 control unit J724.
24. To continue, press v button (item 4).
25. Select menu item "“NEXT”" with ↓ button (item 6).
26. To continue, press v button (item 4). [Note: If the display indicates "“FAULT”", the new turbocharger 1 control unit J724 must be renewed for a second time.]
27. To continue, press v button (item 4).
28. To continue, press v button (item 4).
29. Insert coupling rod.
30. Fit circlips (arrows).
31. Press turbocharger 1 control unit J724 towards the rear without applying force (arrow) until lever (1) rests lightly on bracketVAS 6395/6.
32. Hold J724 in this position.
33. Tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
34. 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.]
35. Loosen bolts (1, 2, 3) until turbocharger 1 control unit J724 can just be moved by applying light force in the direction stated:
36. Tighten bolts (1, 2, 3) to 5 Nm. — 5 Nm (3.7 lb-ft)
37. To continue, press v button (item 4).
38. Tighten bolts (1, 2, 3) to 10 Nm. — 10 Nm (7.4 lb-ft)
39. To continue, press v button (item 4).
40. Unbolt bracketVAS 6395/6(arrow).
41. To continue, press v button (item 4). [Note: If the display indicates "“FAULT”", the new turbocharger 1 control unit J724 must be renewed .]
42. Unplug electrical connectors for testerVAS 6395 A/1.

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