Suspension - Uneven Height/DTC's Set
43 Air suspension height is uneven, pressure holding valve closed
43 13 13
2020095/5
March 4, 2013. Supersedes Technical DIAGNOSIS AND REPAIR Group 43 number 13-12 dated February 4, 2013 for reasons listed.
Vehicle Information
One of the following conditions is present:
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^ The vehicle pulls to one side.
^ The suspension height is uneven and the vehicle is crooked.
^ One wheel location of the suspension is stuck in the raised position.
^ The control system cannot be programmed.
^ The following entries may be stored in the level control system control module, J197 (34):
^ DTC 1781 (extremely crooked vehicle position, upper limit exceeded).
^ DTC 1400 (self-leveling control, upper limit exceeded).
Technical Background
The residual pressure holding valve of an air spring may be stuck closed, not allowing the air spring to reduce its height. This valve's function is to
ensure a minimum air spring pressure of 50 psi in the event of a large leak. For example, if an air supply line was severed by road debris, the residual
pressure holding valve would keep the air spring from completely deflating.
Production Solution
Not applicable.
Service
1. Check the tire pressures. If necessary, adjust to the proper pressures. This is important to ensure accurate measurements.
2. Park the vehicle on a level surface. Leave the engine running to ensure full battery voltage for testing.
3. Using the MMI system, raise the suspension to a lifted level. At each wheel location, measure and record the height at the edge of the fender well
(Figure 1).
4. Using the Guided Functions program of the VAS 5051/2 diagnostic tool, bleed the front and rear axles of the air suspension system.
Note:
If a level change via the VAS 5051/2 is not possible, it may be necessary to clear the DTCs to allow the bleeding procedure. In this case,
record the DTCs prior to erasing the faults.
5. Again, measure the height of each wheel location.
If one wheel location remains significantly higher than the others, a residual pressure holding valve may be stuck closed. Replace the suspected
inoperative residual pressure retaining valve following the removal and installation procedure detailed in ELSA. The replacement procedure can
be found in the Removal and installation sections for the front and rear axles.
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Warranty
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual. Claims are subject to
review or audit by Audi Warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
