I would help but my Touareg is a steel springer. Good as VCDS is I dont think it is great for air suspension issues as it was developed in the USA which didnt have air suspension as an option. I may of course be wrong!!

 

I may of course be wrong!!

you are wrong. VCDS is more than capable of reading/adjusting 7P air suspension.

 

Pressures depend on what the ride height is. What are you trying to obtain from these measurements?

 

My values with normal ride height are below and they don’t change at all when lifting/lowering suspension. I would like to know what is normal range of values and why I have such a big difference comparing left/right side and also front/rear balance doesn’t match. Could it be faulty valve block that gives wrong readings?

MAS03034-IDE03064 Pressure-Accumulator pressure 12.9 bar
MAS03034-MAS01853 Pressure-Left front 17.6 bar
MAS03034-MAS01854 Pressure-Right front 30.7 bar
MAS03034-MAS01855 Pressure-Left rear 12.9 bar
MAS03034-MAS01856 Pressure-Right rear 30.7 bar

 

I would suspect that those numbers would be static, except when the suspension was adjusting.

I would also suspect that those numbers would be close, but would vary if you had two identical Touaregs parked side by side.

Sorry that I don't have the typical numbers to give you for those measuring blocks.

You have read the SSP on the air suspension, right? The SSP will at least give you the basics to understand the system.

If nothing else, this gives the post another bump.

 

I would suspect that those numbers would be static, except when the suspension was adjusting.

No. Pressures vary depending on ride height. If the pressures remained static, how would the system go up or down? Higher bag pressure = higher height. Lower bag pressure = lower height.

OP - I’ll get you numbers from my 2015 later.

 

Accumulator Test in VCDS - AudiWorld Forums

A8 / S8 (D3 Platform) Discussion - Accumulator Test in VCDS - This is for anyone that has run the VCDS output tests for Level Control. How many bars to you initially have when you start the accumulator portion of the output test? Is the pressure supposed to change as part of the test? My value...

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Perhaps useful. VW/Audi/Cayenne all use the same basic system.

 

Alright, on my 2015 at level 3, pressures are:

LF: 9.1
RF: 9.2
LR: 7.6
RR: 6.7

The car was parked on a slightly uneven part of my driveway, which explains why there's a difference of 0.9 between the rears. Also, my Touareg is lowered 30mm from factory specs, so the pressures are about 0.7-1.0 bar lower than a "stock height" Touareg. I rechecked each corner's ride height a few weeks ago and they were all within 3mm of actual height, so the system is calibrated properly.

 

Here are measurements from all corners.

Normal ride height and comfort setting (level 3)

Front left 484mm right 492mm
Rear left 494mm right 497mm

Normal ride height and sport setting (level 2)

Front left 448mm right 456mm
Rear left 463mm right 465mm

Not totally level surface so that should explain small differences comparing left and right. So difference in height is 36mm in front and 31mm in aft between levels 3 and 2. Pressures shown with vcds are always same.

 

There’s definitely something up with the pressure reporting, but if everything’s appears to be working fine, I’d just leave it as is.

 

Don't remember exactly, but I had very similar readings on my 2011. Wondered why the right side had so much higher pressure readings than the left side.
Have a VCDS 12.12 so maybe it has something to do with that?

 

Chewblekka:

Have you managed to calibrate and lower the suspension with VCDS, if so how?

 

I had also vcds 20.12.0 and just updated to 21.3.0.

Pressures are still the same...

 

If you’re adding more air volume, pressure increases.

think of a flat tire on your car. When completely flat, that corner of the car is lowest, with the rim nearly touching the ground. As you increase air pressure (and obviously air volume) the tire fills and raises that corner of the car. The air bags are the same.

OP states his vehicle appears to be functioning properly, and it’s obvisouly impossible for there to be 440psi in an airbag, so I say just ignore the misreading.

 

If you’re adding more air volume, pressure increases.

think of a flat tire on your car. When completely flat, that corner of the car is lowest, with the rim nearly touching the ground. As you increase air pressure (and obviously air volume) the tire fills and raises that corner of the car. The air bags are the same.

But with a tire the contact area gets smaller and smaller as the pressure increase, thus the actual PSI is the same even as the internal pressure increase?

I assume our bags are constant area? There may be som effects from the increasing size of the side walls.

 

As air does compress I would assume there is some increase in pressure when suspension is lifted. If system was filled with, lets say water, the pressure would be more constant.

Still wondering how you lowered your car chewblekka...

 

Still wondering how you lowered your car chewblekka...

I adjusted the values in VCDS by the amount that I wanted to lower it.

 

@chewblekka , as i remember you retrofitted airbags, right? If so, for calibration did you used the old (for 7L or non UDS) procedure or the new one (for UDS vehicles)?
I was thinking to re-calibrate my suspension and dont know if its a good ideea or not. Sometimes, when parked, the front side is lower than rear by a few centimetres. That is one reason, and second, im thinking i can improve the ride quality by doing so. Maybe you can give me some input.

 

I originally used ODIS to calibrate the system, then later VCDS to tweak it. You won’t change the ride quality, that’s mostly based on the damping, which is not adjustable in VCDS, only the 3 position switch.

 

The problem I have is I can't get the right security access to do basic settings and calibrate the height.

 

Try 210673 or 20103

 

Have tried 21673, 210673, 20103, 31564 before.
That is why I was so surprised to hear you had been able use VCDS for this.

Would you mind checking which code you actually get access with at some point when you have the time?

 

Checked the security access again.
I think the problem is I'm using a 12.12 VCDS and it won't accept 210673 as it says it needs to be only 5 numbers.

 

Update your vcds.

 

I don't think I can. Bought it used second hand and seller said it can't be updated.

 

If you have a legitimate cable, or a newer quality aftermarket cable, you can update the software.

 

Will the cable be unusable if I try to update and it won't work?
Or can I simply install the 12.12.0 version again and it will work as before?

 

If its original you'll have no problem updating it. If its a copy its a little more complicated to update it, just a little
First download the software from here: Ross-Tech: VCDS: Downloads: Current Release and Manual
Instal it in a different location. Like this you'll have 2 versions, old one and new one. Connect the cable and see if it works.