Checking charge pressure control solenoid valves N75 and N274 — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Renewed: engine control unit

Don't miss

• Valve must be in installation position.

🔧 Engine codes this applies to

📋 Procedure

1. Remove charge pressure control solenoid valves at left engine support.
2. Attach test hose to connection (2) of solenoid valve. [Note: Valve must be in installation position.]
3. Use test lead from adapter set to connect contact (2) of solenoid valve to battery positive.
4. Connect contact (1) to earth.
5. Replace charge pressure control solenoid valve.

6. Detach connection between contact (1) and earth.
7. Connect up multimeter (voltage measuring range) between contact (2) and battery positive.
8. Switch on ignition.
9. Use current flow diagram to check wiring.
10. Connect multimeter (resistance measuring range) to valve.
11. Replace charge pressure control solenoid valve.
12. Plug in connector at solenoid valve removed.
13. Push back rubber grommet of connector.
14. Connect up multimeter (voltage measuring range) between contacts 1 and 2.
15. From list (1) select function "“04 - Basic setting”".
16. Use keypad (2) to enter "“033”" for "“Display group 033”" and confirm by touching Q key.
17. Activate basic setting by touching key A.
18. Terminate function "“04 - Basic setting”" by touching ← key.
19. Touch "“06 - End output”".
20. Switch off ignition.
21. Slacken off cross-head bolts (1) at electronics box in plenum chamber.
22. Unclip plenum chamber cover (2) at front at bulkhead (arrows).
23. Detach plenum chamber cover.
24. Prise out cover (1) in scuttle panel trim and slacken off rear cross-head bolt (rear right arrow).
25. Slacken off the remaining cross-head bolts (arrows).
26. Detach cover for electronics box in plenum chamber.
27. Screw out bolt (arrow).
28. Disengage retainer.
29. Detach diesel direct injection system control unit J248(Item 1). Release and unplug connectors.
30. With ignition switched off, connect test boxV.A.G 1598/30 to connectors of diesel direct injection system control unit J248 only (not to actual control unit).
31. Check for open circuit and short to earth or positive in the following wiring:
32. Repair wiring if necessary.
33. Replace engine control unit.

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshafts – Audi · 18 torque figures
• Stress-free alignment of exhaust system · 54 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Topping up gear oil
• Cylinder head cover - exploded view · 1 torque figures
• Removing cylinder head - vehicles up to 08.2005 – Audi ASB