Checking camshaft adjustment solenoid valves: Audi A8 D2 2.8 (ACK, ALG, AMX, APR, …)

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: V.A.G 1598/31
• Renewed: solenoid valve

Don't miss

• The camshaft adjustment solenoid valves are supplied with power by way of the fuel pump relay.
• Connect test boxV.A.G 1598/22 or V.A.G 1598/31 to wiring harness to engine control unit, but do not connect actual engine control unit 24.

🔧 Engine codes this applies to

📋 Procedure

1. In list (1) select function "“03 - Final control diagnosis”".
2. Keep touching → key until camshaft adjustment solenoid valves are actuated.
3. Terminate function "“03 - Final control diagnosis”" by touching ← key.
4. Switch off ignition.
5. Remove engine cover (arrows).

6. Unplug corresponding connector at solenoid valve.
7. Connect multimeter (resistance measuring range) to valve.
8. Replace solenoid valve. [Note: The camshaft adjustment solenoid valves are supplied with power by way of the fuel pump relay.]
9. Unplug connector at corresponding solenoid valve.
10. Connect up voltage testerV.A.G 1527 B between contact (1) and earth.
11. Briefly operate starter.
12. Check wiring from contact 1 of connector via fuse to fuel pump relay for open circuit .
13. Eliminate open circuit in wiring if necessary.
14. Connect up voltage testerV.A.G 1527 B between contacts (1) (positive) and (2) of connector.
15. Repeat function "“03 - Final control diagnosis”".
16. Keep touching → key until camshaft adjustment solenoid valves are actuated.
17. Terminate function "“03 - Final control diagnosis”" by touching ← key.
18. Switch off ignition.
19. Connect test boxV.A.G 1598/22 or V.A.G 1598/31 to wiring harness to engine control unit, but do not connect actual engine control unit 24.
20. Check for open circuit and short to earth/positive in the following wiring from inlet camshaft timing adjustment valve 1N205 or inlet camshaft timing adjustment valve 2N208:
21. Repair wiring if necessary.
22. Replace engine control unit 24.
23. Replace mechanical camshaft adjuster Removing and installing camshafts and camshaft adjuster.

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