Checking electrohydraulic engine mounting solenoid valves N144 and N145 — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Renewed: valve

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• Connect vehicle diagnostic, testing and information systemVAS 5051B and select vehicle system "“01 - Engine electronics”" from list. When doing this, the ignition must be switched on.
• Connect adapter cable, 121-pinV.A.G 1598/31 to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth (not shown in illustration) 24.

🔧 Engine codes this applies to

📐 4 workshop diagrams for BCY

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Connect vehicle diagnostic, testing and information systemVAS 5051B and select vehicle system "“01 - Engine electronics”" from list. When doing this, the ignition must be switched on.
2. From menu (1) select diagnosis function "“03 - Final control diagnosis”".
3. Press the → key repeatedly until the following display appears:
4. Press the → key again.
5. Press the → key.

6. Press the → key again.
7. Press the ← key to exit from function "“03 - Final control diagnosis”".
8. Switch off ignition.
9. Release fasteners (1 … 4) and take off noise insulation.
10. Unplug electrical connector at relevant valve (arrow).
11. Connect multimeter (resistance measuring range) to valve.
12. Renew the valve.
13. Connect voltage testerV.A.G 1527B as follows:
14. Switch on ignition.
15. Switch off ignition.
16. Refer to current flow diagram to check for open circuit in wiring from contact 1 of connector via fuse to Motronic current supply relay J271.
17. Repair wiring connection if necessary.
18. Connect voltage testerV.A.G 1527B to contacts (1) (plus) and (2) of the connector.
19. From menu (1) select diagnosis function "“03 - Final control diagnosis”".
20. Press the → key repeatedly until the following display appears:
21. Press the → key again.
22. Press the → key.
23. Press the → key again.
24. Press the ← key to exit from function "“03 - Final control diagnosis”".
25. Switch off ignition.
26. Connect adapter cable, 121-pinV.A.G 1598/31 to connectors of wiring harness; do not connect engine control unit. Connect earth clip of test box to earth (not shown in illustration) 24.
27. ⚠ To prevent damage to electronic components, select appropriate measuring range before connecting measuring leads and observe test requirements. — Check for open circuit and short to positive or earth in the following wiring:
28. Repair wiring connection if necessary.
29. Fit a new engine control unit 24.
30. Renew the relevant electro-hydraulic engine mounting.

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