Hi all

So I woke up to my cayenne sat at the lowest possible height it could be - wheels almost touching the arches

Went to local garage in village who were unable to read any fault codes from a Porsche due to not having any diagnostic tools other than SnapOn

Got her back and ordered iCarsoft V2 POR and thought id have to wait a few days but then thought id give my VCDS setup a go thinking maybe the modules might be VW parts. Hurray it worked although reading my car as a VW Touareg lol

I get 8 faults from the Level Control 7L0907553F - in part :

01772 - Signal from Level Control Pressure Sensor (G291) 009 - Open or Short to Ground - Intermittent
01437 - Control Position not Learned 005 - No or Incorrect Basic Setting / Adaptation
01770 - Temperature Sensor for Level Control Pump/Compressor (G290) - 101 Open or Short to Plus - Intermittent
AND
ALL FOUR Level Control System Sensor (G76, G77, G78)
AND
01769 - Sensor for Vehicle Leveling : Front Right (G289)

I personally cannot believe that all these sensors went all at the same time overnight. And to add to this I also got...

ABS Brakes 7LO907379G

01310 - Level Control System Control Module (J197) - 044 - No Signal/Communication - Intermittent

All of this seems to be saying its the Level Control Unit itself that's failed. I don't mind this cause I can get a used one from ebay for about £80 and its an easy swap over. But just wanted to see what you all think - Am I diagnosing this correctly?

BTW I HAVE seen the thread regarding repairing the module - looking for solder points on the relay - i've looked over my circuit board and apart from it being covered in some red goop on one side I couldn't see really any split solder points.

 

Yes or a wiring issue.

 

Oh ****e didn't think about that

But why on earth would a wiring issue happen all of a sudden?!?! And where? And how to diagnose that??

 

How old is your battery. The subsystems in these vehicles is very sensitive to battery voltage and if it dips below 12v you'll get all kinds of weird and false system messages.

 

Thanks all for your replies

battery does seem something many of you have mentioned so I will defo check that

im working the rest of the week so will get to look at this again at the weekend

in the meantime I’ve managed to get two level control module units for just over £100 from two different places - I’ll also give these ago at the weekend plus my iCarsoft POR 2 arrives today so with all that I’m sooo hoping I can fix this at the weekend - I’m missing my Cayenne big time lol

 

So plugged in icarsoft POR V2 confirmed faulty controller. Cleared all faults - started car just to make sure and nothing - read faults again once again faulty controller

so the one off eBay arrived today also and so I plugged this in - started car and I can hear the pump doing it’s thing but car doesn’t raise. Dash shows all three down arrows.

i go to use the ride level adjuster at the gear stick area and no lights and nothing happens

read faulty codes now it’s saying switch fault. Clear all codes fire up cara again same situ - heat the pump, three down arrows and no lights on the rise height adjuster

check error codes and again says faulty switch

my question: does anyone know if there is a kind of setup procedure you have to do to get the Level Control Module to relearn ride height? Or kick in to integrate with what’s already in place?!

bare In mind my suspension is at the very lowest like wheels touching arches low.

could really do with someone that knows how this system works lol

 

Basic setting/adaptation consists in giving the car the current height values measured as per the workshop manual so it can adjust itself.

From the other renn-forum:



Whether your Icarsfot is capable to do it I don't know.

I was able to use VCDS Adress 34 Suspension Level Control Adaptation to do so in both a 2004 and a 2006 CS.

Besides this, seems that the switch is fried or is getting no power. May be worth checking for power in both the control switch and control module - might end up inoperative as the previous one if there is some wiring issue.

 

OK so the module I got off eBay was from a Touareg - that being the case it’s ride measurements are like 470 front and 530 rear - or something like that.

so I plugged my VCDS in and can talk to the module and I’ve done Security Access and then adaptations. The module on channel 1 - 4 always shows WAIT while I hear the compressor but nothing ever changes ride height wise and eventually the cash comes up with Red Air Suspension failure. I can never get the VALUE to show (it always stays on WAIT or errors out)

problem is I can only TEST and SAVE the adaptations when the figure shows VALUE - it will not save if I try and change it whilst WAIT is shown

also as regards the control
switch by the gearstick, with the eBay Touareg module plugged in it does not work - no lights on it etc - but if I plug the original Cayenne module it it does light up and work. So it has power and works. I’m guessing the adjuster switch may be different part in Touareg and that’s why it don’t recognise it?!!

so I’m stuck again with car still at very lowest setting

in fact fault code keeps coming up that lower level has exceeded maximum

I just don’t know how to get it to raise. I hear the compressor and at times I’ve got the Accumulator Pressure building notice but nothing ever happens then it gives red Air Suspension again

in VCDS and iCarsoft the car battery is always over 14v and the compressor gains temperature when on and drops when off

im following Ross-Tech calibration document to try and reset the values but as I say I’m being held up by the WAIT signal and can’t change anything

im at a loss

 

While you might be able to install and communicate your VCDS or iCarsoft to the module from the Touareg I am pretty sure the wiring from/to the other components in the system and therefore the pin configuration in the control unit connector will be different from the Touareg to the Cayenne. Also the firmware in the module will be different, hence the difference in measuring the reference height in the two cars as you mention.
You definitely want to install a control unit taken off a Cayenne to carry on with your troubleshooting.

 

Have you met all the parameters for height calibration?
I can’t remember what they are but a search will find them all.
(TPMS working and correct being one I remember).

 

Just so you know, there is a splice under the carpet that is prone to corrosion and affects the ride height system.
In my case it didn't cause the drastic problems you describe, but maybe my wire was just partially buggered for lack of a better word.
I believe it was under the driver's side (US).

 

hi - I don’t know what the exact requirements are tbh. But saying that I clear all fault codes from the Level Control Module and all that keeps coming back is that it’s exceeded maximum lowness and calibration has not been done

the only other error I have when I place the original Porsche module is from ABS module saying there’s an error with the Level Control Module

if I place the Touareg one in from eBay that ABS ones goes but I get no where getting a reading from VCDS to allow me to do adaptation

i think at this stage I will search for a used part from eBay that’s been removed from a Cayenne and I’ll update you all on here with how I get on. It’s gonna be about a week before I can do that though

I’ll defo keep updating cause im
sure I’m not and won’t be the only one this ever affects

thanks everyone for your help so far

plan : get another module this time from a Porsche THEN keep diagnosing

quick question : I don’t get any errors regarding faulty Accumulator and I can see the compressor temp raises when engaged too, but if it was a failure of the Accumulator what could I do to check this? And what part(s) would be involved in repairing ?

 

In the meantime can anyone answer this:

my accumulator tanks are empty hence why I guess my suspension is right down low. I would have thought the compressor which I know works and kicks in doesn’t seem to be filling these tanks

why would this happen? How can I encourage the tanks to fill ? What part(s) would be causing this to not happen?

my dash says filling accumulator but it then errors out with Air Suspension red warning

any ideas?

 

I just did a quick search regarding the control units and it seems that the part 7L0 907 553 should be fine whether is coming from a Cayenne or Touareg but I still find confusing how the switch will work with one and not the other.

Since your compressor runs but nothing happens consider as well checking all the hoses in the valve block or compressor itself and try to look for a leak while it runs.

 

I also think there's some type of membrane that's in the compressor that actually allows it to build pressure from the compressor to the lines. If that is torn the compressor will run and time out, but not move any air. From my reading Arnott should have any comments that you might need to repair the system once you know where the problem is.

If you hook up the included air hose that uses the inboard compressor as a way to inflate the tires, does any air come out of the hose or is the compressor not moving any air at all?