Checking solenoid valves for electrohydraulic engine mountings — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Renewed: valve

Don't miss

• Connect test boxV.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

📋 Procedure

1. Connect up the vehicle diagnostic, testing and information systemVAS 5051B.
2. Switch on ignition.
3. Press Vehicle self-diagnosis key, select vehicle system "“01 - Engine electronics”" system and press → key to activate function.
4. From menu (1), select function "“005 - Final control diagnosis”" and press → key to activate function.
5. Press → key repeatedly until electrohydraulic engine mounting solenoid valve (right-side)N145 is activated.

6. Press → key repeatedly until electrohydraulic engine mounting solenoid valve (left-side)N144 is activated.
7. Press ← key to exit from function "“005 - Final control diagnosis”".
8. Switch off ignition.
9. Vehicles with auxiliary heater: remove bolts (arrows) securing exhaust pipe for auxiliary/additional heater to noise insulation.
10. Release quick-fasteners (1) and (2) and take off front noise insulation. Leave rear noise insulation in position.
11. Unplug electrical connector at relevant valve (arrow).
12. Connect hand-held multimeterV.A.G 1526 C to valve to measure resistance.
13. Renew the valve.
14. Connect voltage testerV.A.G 1527 B as follows:
15. Switch on ignition.
16. Switch off ignition.
17. Use current flow diagram to check for open circuit in wiring from contact 1 of connector via fuse to Motronic current supply relay J271.
18. Repair wiring connection if necessary.
19. Connect voltage testerV.A.G 1527 B between contacts (1) and (2).
20. From menu (1), select function "“005 - Final control diagnosis”" and press → key to activate function.
21. Press → key repeatedly until electrohydraulic engine mounting solenoid valve (right-side)N145 is activated.
22. Press → key repeatedly until electrohydraulic engine mounting solenoid valve (left-side)N144 is activated.
23. Press ← key to exit from function "“005 - Final control diagnosis”".
24. Switch off ignition.
25. Connect test boxV.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.
26. ⚠ 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:
27. Repair wiring connection if necessary.
28. Fit a new engine control unit 24.
29. Renew the relevant engine electrohydraulic engine mounting.

Other AUDI procedures

• Checking radiator fan V7 and radiator fan 2 V177 – Audi 4.2
• Removing and installing auxiliary radiator (left-side) – Audi
• Removing and installing parts of exhaust system
• Testing fuel pump control unit -J538
• Renewing crankshaft oil seal (timing chain end) – Audi A6 C6
• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures