Adjusting vacuum unit for turbine changeover: Audi A6/A7 C7 (CDUC, CDUD, CGQB, CKVB, …)

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018)

• Special tools named: VAS 6213

Don't miss

• Disregard (items 1, 2).
• The turbocharger testerV.A.G 1397A cannot display values greater than 580 mbar.
• Counterhold operating rod (2) when loosening lock nut (3).
• A half turn of the operating rod (2) corresponds to a change in voltage of 68 mV.
• Counterhold operating rod (2) when tightening lock nut (3).

🔧 Engine codes this applies to

📐 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 hose clip (3) and detach air hose. [Note: Disregard (items 1, 2).]
3. Disconnect vacuum line to vacuum unit for turbine changeover at turbine changeover valve N529(arrow).
4. Connect hand vacuum pumpVAS 6213 and pressure control valveVAS 6342 to disconnected vacuum line and connection "“II”" of turbocharger tester V.A.G 1397A, as shown in illustration.
5. Close pressure control valveVAS 6342.

6. Move adjuster ring (2) on hand vacuum pumpVAS 6213 to select "“vacuum”".
7. Switch on turbocharger testerV.A.G 1397A and set sliding switch to position "“II”".
8. On vehicle diagnostic tester select function 02-Measured values in Guided Fault Finding 01-Engine electronics.
9. Select measured value Bypass valve turbocharger hp turbine inlet, raw voltage from list.
10. Operate hand vacuum pumpVAS 6213 until turbocharger testerV.A.G 1397A indicates the following value:
11. Read voltage level off vehicle diagnostic tester:
12. Check setting by operating hand vacuum pumpVAS 6213 until pressure tester of VAS 6213 indicates the following value: [Note: The turbocharger testerV.A.G 1397A cannot display values greater than 580 mbar.]
13. Read voltage level off vehicle diagnostic tester:
14. Remove catalytic converter .
15. Vent system via pressure control valveVAS 6342 so that vacuum reading drops to approx. 100 mbar. [Note: Counterhold operating rod (2) when loosening lock nut (3).]
16. Loosen lock nut (3) using crow foot wrench.
17. Unclip securing clip (1) and detach operating rod from adjusting lever.
18. Lengthen or shorten upper part of operating rod (2) by turning it about its own axis. [Note: A half turn of the operating rod (2) corresponds to a change in voltage of 68 mV.]
19. Slide operating rod (2) onto adjusting lever.
20. Repeat test with hand vacuum pumpVAS 6213 and vehicle diagnostic tester. [Note: Counterhold operating rod (2) when tightening lock nut (3).]
21. If specification is attained, fit securing clip (1) and tighten lock nut (3).
22. Check setting again by operating hand vacuum pumpVAS 6213 until pressure tester of VAS 6213 indicates the following value: [Note: The turbocharger testerV.A.G 1397A cannot display values greater than 580 mbar.]
23. Read voltage level off vehicle diagnostic tester:
24. Install catalytic converter .

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