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MarkGolf
Hockenheim


Joined: 13 Nov 2012
Posts: 715
Location: S.London


PostPosted: Wed Apr 10, 2019 4:55 pm    Post subject: Cayenne chassis system fault - 957 gts Reply with quote

Hello

First prob with the Cayenne.

Chassis system fault

Warning appears on the dash after pulling away. Even when warning is present, I can adjust the ride height and everything appears normal. If I press the sport button, I get failure sport mode and nothing happens.

When driving, the ride is soft and the car rolls in corners which isn’t normal, if I turn car off, the error disappears and I can put it in sport mode and the car drops down, all fine but as soon as I accelerate, chassis error followed by sport mode failure.

Pdcc and air equipped GTS.

Will check codes later, gauge shows over 15v for battery.

Last night I did randomly get main beam failure but it was ok after turning it off and in..

Cheers
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ragpicker
Reims


Joined: 14 Apr 2013
Posts: 4015
Location: North East England


PostPosted: Wed Apr 10, 2019 5:32 pm    Post subject: Reply with quote

Need the codes dude, could be a few things from what I understand.

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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6964
Location: Brighton


PostPosted: Wed Apr 10, 2019 7:50 pm    Post subject: Reply with quote

As ragpicker said .. need some fault codes to have an idea .. many things are possible .

A fault code will shut down certain parts of the system .

Main beam failure .. hmm .. its not related to the leveling system so a strange one .. wondering about water ingress atm .. fault code and we can go from there though .
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MarkGolf
Hockenheim


Joined: 13 Nov 2012
Posts: 715
Location: S.London


PostPosted: Wed Apr 10, 2019 10:25 pm    Post subject: Reply with quote

Hi Guys

Thanks for the replies.

So I tried my eBay code reader and app (dash command) which has always served me well and neither of them bring back any codes when the error is being displayed on the dash, none what so ever! Tried ignition on, car off, car off etc etc, never any codes! Battery voltage was just under 12v with the ignition on according to my app. Shows 14.6 when car running.

Do these codes need a specialist reader?

Doh!! It’s amazing what a difference this has made to the car, really has highlighted what the pdcc does! I almost slid out of my seat and fell out the window going around and round about just now. Floor

So no codes Sad will see if a friends snap on reader is any better on the weekend.

Just to add, the car was fine and had been used daily all week, not been in any rain, the missus went to ikea and on the way how, chassis system faulty appeared for the first time after setting off.

The error ALWAYS appears only after moving forward or backwards, if I don’t move, the code will not appear no matter how many times I got up and down and in and out of sport mode.
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Current fleet
1991 964 Carrera
2005 997 Carrera S
2008 957 Cayenne GTS
2003 Boxster 2.7
1994 Eunos Roadster S Special Turbo 270bhp!
1991 Mercedes 500SL
1979 Mercedes 280e
1995 VW Golf VR6 3.0
 
  
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MarkGolf
Hockenheim


Joined: 13 Nov 2012
Posts: 715
Location: S.London


PostPosted: Fri Apr 12, 2019 9:03 am    Post subject: Reply with quote

Just updating;

Not had a chance to get the code checked by someone with a grown up machine but as of this morning, no errors, all back to normal! PC Surprised

Frustrating as I did want to shoot over to somewhere at lunchtime to get it checked.

Must get my own version of durametric
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Current fleet
1991 964 Carrera
2005 997 Carrera S
2008 957 Cayenne GTS
2003 Boxster 2.7
1994 Eunos Roadster S Special Turbo 270bhp!
1991 Mercedes 500SL
1979 Mercedes 280e
1995 VW Golf VR6 3.0
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6964
Location: Brighton


PostPosted: Fri Apr 12, 2019 8:28 pm    Post subject: Reply with quote

You have an intermittent fault from the sounds of it ..

It could be anything and without a code im in the dark ..

i Will say .. i had a pdcc fault a few weeks back .. code for RA pressure sensor .. its a valve body basically for pressure into and out of the rear roll bar .. i replaced the valve body and job done .

Basically a code led me to this .. there was a bit of thinking about it and working out the system .. how it works but i needed the code and dare i say it a judgement call as i couldn't prove it as it was intermittent to then spend a fair amount of wedge on the customers behalf to fix it Very Happy
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MarkGolf
Hockenheim


Joined: 13 Nov 2012
Posts: 715
Location: S.London


PostPosted: Tue Apr 16, 2019 9:08 am    Post subject: Reply with quote

Cheers Iain!

Problem solved, I think.. Still hadn't had the warning reoccur but after poking around, I found a plug which had the clip undone on the front shock area, pushed it back in so it clicked, later found that to be the acceleration sensor.. Perhaps why the warning was coming up after moving away, I think I may have undone the plug when cleaning/painting. Whoops, either way, fingers crossed.

Thanks all
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Current fleet
1991 964 Carrera
2005 997 Carrera S
2008 957 Cayenne GTS
2003 Boxster 2.7
1994 Eunos Roadster S Special Turbo 270bhp!
1991 Mercedes 500SL
1979 Mercedes 280e
1995 VW Golf VR6 3.0
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6964
Location: Brighton


PostPosted: Tue Apr 16, 2019 7:11 pm    Post subject: Reply with quote

Its very possibly the fault .. a poor connection .. the bane of my life .. it doesn't take much for this sort of thing to throw up intermittent faults ..

Also unplugging a connection and refitting it can also fix faults .. seen it for many years now and again its a pain when you are trying to find a fault and its suddenly fixed .. you then try and back track to think what you have unplugged so you can recheck the pins .
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Kedar
Newbie


Joined: 30 Apr 2019
Posts: 1



PostPosted: Thu May 02, 2019 9:08 am    Post subject: Reply with quote

I find that the disassembly, to truly follow the flow of the code, would need to have a full simulation of the function of the target microcontroller. For example, I find that there is a function in the code which is called and copies a large block of memory from one location to another location in memory and then uses a JMP command to push the program counter to that location. Within the copied/relocated code, there are positional references (ex. VBR command) which are relative to the moved location (i.e. they are not valid references to code in the locations as it is read from the hex file). This means that in order for a disassembler to follow the flow of the code and all of the branching it entails, it would need to interpret the intent of the copying algorithm as well as performing the copy. Only then could it read the instructions meant for those memory addresses and interpret them correctly.
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