Checking function of variable valve timing: Audi A4 B5 (ACK, AGA, AGE, AGU, …)

🧭 Before you start

Fits: Audi A4 B5 (8D)

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• Engine running at idling speed.

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ Test equipment must always be secured on the rear seat and operated from that position by a second person.If test and measuring instruments are operated from front passenger's seat and the vehicle is involved in an accident, the person sitting in this seat could be seriously injured when the airbag is triggered. — Start engine and run at idling speed.
2. From the list (1) select diagnostic function "“08 - Read measured value block”".
3. Use keypad (2) to enter "“27”" for "“Display group number 027”" and confirm by touching the Q key. [Note: Engine running at idling speed.]
4. Check specifications in display zones (1), (3) and (4).
5. Perform test drive.

6. Check specifications in display zones (1), (3) and (4).
7. Exit function "“08 - Read measured value block”" by pressing the ← key.
8. Press "“06 - End output”".
9. Switch off ignition.
10. Check the camshaft control valves .
11. From the list (1) select diagnostic function "“08 - Read measured value block”".
12. Use keypad (2) to enter "“90”" for "“Display group number 090”" and confirm by touching the Q key. [Note: Engine running at idling speed.]
13. Check specifications in display zones (2), (3) and (4).
14. Perform test drive.
15. Check specifications in display zones (2), (3) and (4).
16. Exit function "“08 - Read measured value block”" by pressing the ← key.
17. Press "“06 - End output”".
18. Switch off ignition.
19. Check the camshaft control valves .

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