Air Spring Shock Absorber And Level Control System, Troubleshooting: Notes
WARNING: This page is about a different car, the 2017 Volkswagen Touareg, 2016 Volkswagen Touareg, and 2015 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.
| Condition | Verification | Possible Causes | Corrective Action |
|---|---|---|---|
| Leakage at air spring shock absorber | Repair the air spring shock absorber front. Refer to AIR SPRING SHOCK ABSORBER, REPAIRING rear. Refer to REAR AIR SPRING SHOCK ABSORBER, REPAIRING | ||
| >>Creeping<< loss of pressure vehicle sits crooked after a longer time period | Observe level over longer time period and identify leakage using commercially available leak-detection spray. Refer to Perform the following test under these conditions: | Leakage at air lines | Servicing the air line. Refer to AIR LINE, SERVICING . |
| Leakage at the pressure retaining valve | Replace the pressure retaining valve Front. Refer to PRESSURE RETAINING VALVE, REMOVING AND INSTALLING , Rear. Refer to PRESSURE RETAINING VALVE, REMOVING AND INSTALLING . | ||
| Vehicle sits crooked no leakage | Perform Guided Fault Finding with the Vehicle Diagnostic Tester. | Level control system sensor malfunctioning | Replace level control system sensor front. Refer to FRONT LEFT/RIGHT LEVEL CONTROL SYSTEM SENSOR -G78- / -G289-, REMOVING AND INSTALLING . Rear. Refer to LEFT/RIGHT REAR LEVEL CONTROL SYSTEM SENSOR -G76- / -G77-, REMOVING AND INSTALLING . |
| Linkage or bracket of level control system sensor is bent | |||
| Vehicle sits too high, cannot be lowered | 1.) Check whether vehicle has sufficient ground clearance | Vehicle has bottomed out | |
| 2.) Check air lines and line routing | Air line plugged, pinched or frozen | Make sure the air line is inserted far enough into the pressure retaining valve Repair kinked air lines. Refer to AIR LINE, SERVICING . Clean out frozen or plugged air lines with compressed air | |
| 3.) Perform Guided Fault Finding with the Vehicle Diagnostic Tester. | Exhaust valve or air spring valve malfunctioning | ||
| Vehicle sits crooked and cannot be raised or can only be raised very slowly | 4.) Perform Guided Fault Finding with the Vehicle Diagnostic Tester. | Inspection of electrical system relays, harness connectors, wiring and fuses | |
| 5.) Identify leakages at pressure reservoir using commercially available leak-detection spray | Pressure reservoir defective/leaking | Replace the pressure reservoir. Refer to PRESSURE RESERVOIR, REMOVING AND INSTALLING . | |
| Air line or connections to pressure reservoir defective/leaking | Service the air line. Refer to AIR LINE, SERVICING . | ||
| 6.) Perform Guided Fault Finding with the Vehicle Diagnostic Tester. | Exhaust valve defective/leaking/open | Replace the Adaptive Suspension Valve Block -NX7-. Refer to Adaptive Suspension Valve Block -NX7-, REMOVING AND INSTALLING . | |
| Switch-over valves defective/leaking/open | Replace the compressor Refer to COMPRESSOR WITH Adaptive Suspension Valve Block -NX7-, REMOVING AND INSTALLING . | ||
| 7.) Identify leakages at the compressor using commercially available leak-detection spray | Compressor leaking | Replace the compressor Refer to COMPRESSOR WITH Adaptive Suspension Valve Block -NX7-, REMOVING AND INSTALLING . | |
| 8.) Identify leakages at the air spring shock absorber using commercially available leak-detection spray | Leaking air line, connections, pressure retaining valve or air spring | Repair the air spring shock absorber | |
| 9.) First check points 5-8. If no problems are found, the compressor is malfunctioning | Compressor malfunctioning | Replace the compressor Refer to COMPRESSOR WITH Adaptive Suspension Valve Block -NX7-, REMOVING AND INSTALLING . | |
| >>Quick<< pressure loss | Vehicle level is uneven, when attempting to change vehicle level, air escapes audibly from defective air spring | Air spring is defective | Repair the air spring shock absorber Front. Refer to AIR SPRING SHOCK ABSORBER, REPAIRING . Rear. Refer to REAR AIR SPRING SHOCK ABSORBER, REPAIRING . |
| Air line is torn off | Servicing the air line. Refer to AIR LINE, SERVICING . |
Front Air Line Installation Position
The air line has two markings.
Insert the air line until the front marking -arrow A- is completely covered by the union nut.
Ensure that only the second marking -arrow B- on the air line is visible.
Rear Air Line Installation Position
The rear air line is covered with shrinkable tubing.
-- Insert the air line until the end of the shrinkable tubing -2- is in contact with the union nut -1-.
The end of the shrinkable tubing may be a maximum of 2 mm in front of the union nut.