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

🧭 Before you start

Fits: VW Touareg I (7L, 2002–2010)

📋 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 the engine.
4. Pull the plug off the adaptive suspension control unit J197 so the adaptive suspension cannot adjust its level.
5. Now measure the ride height of the vehicle at all four wheels.

6. Measure the ride height again after 2 hours and compare dimension (a) with the first measurement.
7. Use commercially available leak detector spray to check the air spring struts and the corresponding air line in this sequence:
8. Unscrew the affected line from the air spring strut and solenoid valve block.
9. Use compressed air to blow through the line several times to clean it. Apply the compressed air to the solenoid valve block end of the line when doing this.
10. Check whether there is any shock absorber oil in the solenoid valve block.
11. Check the internal line from the air supply unit to the solenoid valve block.

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