Fault finding, air suspension strut and self-levelling suspension — VW

🧭 Before you start

Fits: VW Phaeton (3D)

📋 Procedure

1. Start engine.
2. Use the central display and operating unit for information, front J523 to move the vehicle to the high level then back to normal level.
3. Switch off engine.
4. Pull connector off adaptive suspension control unit J197 so that adaptive suspension cannot make changes.
5. Now measure height of vehicle at all 4 wheels.

6. Measure the ride height again after 24 hours and compare dimension (a) with the first measurement.
7. Use commercially available leak detector spray to check the air suspension struts and the corresponding air line in this sequence:
8. Unbolt affected line from air suspension strut and solenoid valve block.
9. Blow out line with compressed air several times. To do this, direct air in through end of line at solenoid valve block.
10. Check whether damper oil has entered solenoid valve block.
11. Check the internal line from the air supply unit to the solenoid valve block.

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