Suspension Stuck on Lift

[migelus]

Hello Guys,

maybe you can give me a little hint where could be an issue

Last Friday, when I was switching from comfort to Lift, front Axle get stuck
(car was not used for two months) and I see VCDS error:

01400 - Suspension Level Control
001 - Upper Limit Exceeded - Intermittent
Freeze Frame:



compressor looks fine to me , I did test and filled the reserve tank up to 14 bars - I can also release the pressure from it.

If I pump the rear axle up to 6.5 bar (I see that car it's leveling) I can also lower the rear suspension through VCDS.


Unfortunately with Front there is something wrong.
Before pumping up, there were 2 Bars, after bleeding the value has changed to 0.98, but no difference in heigh.

Later I fill it up to 9.5, and front changed height from 57mm to 95mm and stuck there!

Once again releasing air (bleeding in vcds) has no effect - I see that it's releasing air from 9.77 to 0.98 very quickly aprox. in 1 second- for comparision, rear axle take at least 10 seconds, and I can see values slowly droping in steps, from 6.5, 6.18, 5.92 and so on...

[DJS]

Hello, I had a similar issue on a VW Touareg a while ago and turned out to be seized pressure valves that bolt to the struts. On mine they were letting air go in but would not let air out so suspension would stay high at the front. Also when doing bleeding as you have they would drain almost instantly as yours are due to only draining the lines to the struts. Might not be your problem but worth a look.

[Delboy]

I suspect the valves may be stuck shut but that may be because you over pressurised the struts.

If I remember correctly the front struts are 4.5 bar max

You may need to release the pressure manually from the struts.

[migelus]

Originally Posted by Delboy

I suspect the valves may be stuck shut but that may be because you over pressurised the struts.

If I remember correctly the front struts are 4.5 bar max

You may need to release the pressure manually from the struts.

Thanks a lot Guys!

seems it could be this - I was able to release pressure manually
I will have to adapt the suspenion, and will post the results
...the only weird thing though, is that two valves were replaced 2 months ago...

[migelus]

small update,

I have unscrew valve completely, after this procedure, finally I heard desired psttt sound of released air

I was able to LIFT



and later switch to comfort


A believe I still have to make adaptation, cause I see difference in height on right and left side...

[migelus]

quick update

It looks I can have faulty VCDS...

When i enter adaptation, 31564 like in this procedure
RossTech

I get:



I tried also in coding II but effect is the same... New interface will arrive next week, and we will see

PS: BTW, I have air suspension - sport - or at least MMI thinks I have, but the procedure, codes, should be the same for this option?