Checking charge pressure of turbochargers: Audi A8 D2 3.3 TDI (AKF)

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: VAS 5051
• Renewed: turbocharger

🔧 Engine codes this applies to

📋 Procedure

1. Screw out rear left screw plug at intake manifold and screw in adapterV.A.G 1318/11.
2. Connect turbocharger testerV.A.G 1397 A using test hose (1).
3. Guide measurement hose over rear edge of bonnet and through right window opening into passenger compartment.
4. Switch on turbocharger tester and set measuring range switch to (I) (absolute pressure).
5. Attach measurement hose to connection (I). [Note: Hose connections must be absolutely free from leaks to prevent possible measurement errors.Take care not to trap measurement hose at bonnet and side window.Pressing memory button M on turbocharger tester causes last measured value to be stored until memory button M is pressed again or tester is switched off.Storage is indicated by flashing of the decimal point in the display zone.An arrow appears in the top left corner of the display if the battery voltage of the turbocharger tester drops below the permissible specification.Before checking, drive vehicle at least 3 km at steady speed (without stopping at traffic lights etc.).]

6. ⚠ A second person is required, as the display values are read out whilst driving. Heed notes on safety . — From list (1), select function "“08 - Reading measured value block”".
7. Use keypad (2) to enter "“011”" for "“Display group 011”" and confirm by touching Q key.
8. Drive at approx. 60 km/h and switch to "“Tiptronic - gear 3”".
9. Accelerate vehicle in 3rd gear at full throttle (without kick-down) and in doing so observe engine speed.
10. At approx. 3000 rpm, press key panel "“Print - store result”" on VAS 5051 A and at the same time press memory button M on turbocharger testerV.A.G 1397 A. [Note: The charge pressure level should be determined using the turbocharger testerV.A.G 1397 A. The vehicle diagnostic, testing and information systemVAS 5051 A serves to check whether the charge pressure is also being recorded in the control unit.]
11. Terminate function "“08 - Reading measured value block”" by touching ← key.
12. Touch "“06 - End output”".
13. Switch off ignition.
14. Check linkage and vacuum units for charge pressure control .
15. Check charge pressure control solenoid valves N75 and N274.
16. Replace turbocharger.

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