Air suspension 01772 fault code

[samiam]

While I'm on a roll..
My air suspension gives a occasional 01772 code =Level Control Pressure sensor -G291 Implausible signal, sporadic.
No leaks/settling of the air bags.
Compressor seems fine.
When this fault appears the suspension won't adjust up and down, but functions fine at whatever level it's at.
The whole system works fine most of the time.
Anyone won this fight before and can tell me how to narrow down the issue? Could it be as easy as a dodgy connection?

[Daft]

While I'm on a roll..
My air suspension gives a occasional 01772 code =Level Control Pressure sensor -G291 Implausible signal, sporadic.
No leaks/settling of the air bags.
Compressor seems fine.
When this fault appears the suspension won't adjust up and down, but functions fine at whatever level it's at.
The whole system works fine most of the time.
Anyone won this fight before and can tell me how to narrow down the issue? Could it be as easy as a dodgy connection?

That error code indicates that the harness that feeds the level control pressure sensor has an intermitent short on it's 12V positive wire.

The pressure sensor is crammed into a cavity underneath the car where the strut control valves and pressure accumulator also reside.

The cavity is just above the rear sway bars at the center of the floor pan. The strut valves and the level control pressure sensor have a single harness. It has a 10 pins and pin #10 at the underside is the 12V+ wire (green w/red). This wire comes from the control module for the suspension system which is in the sidewall of the driver's side trunk area. The module has two harnesses, one is a 18pin and the other is a much larger 48pin. You would want to check the wiring from pin #10 under the car to pin #1 at the 18pin harness on the main control module in the trunk lining.

If you want, I can send you a PDF of the wiring schematic and the diagrams of the harnesses at each end.

[samiam]

Thanks for the reply, at last an allroad knowledge base that appears to match the audifans.com s-list I've been on for years for my beloved S4.
Yes please a PDF would be superb.
[email protected].
I'd like a more thorough understanding of the control systems of the air suspension, can you point me at a suitable thread/article that I might learn from.
I'd also like an understanding of wheel alignment and how to set it up correctly given the complexity of the various heights especially as it relates to sitting on a wheel alignment machine.

[Daft]

Thanks for the reply, at last an allroad knowledge base that appears to match the audifans.com s-list I've been on for years for my beloved S4.
Yes please a PDF would be superb.
[email protected].
I'd like a more thorough understanding of the control systems of the air suspension, can you point me at a suitable thread/article that I might learn from.
I'd also like an understanding of wheel alignment and how to set it up correctly given the complexity of the various heights especially as it relates to sitting on a wheel alignment machine.

Unfortunately, I haven't seen many threads that explain all the inner workings of the air ride suspension. I've been able to expand my knowledge of them from the Bentley Manual and the ETKA parts system on my laptop.

I can send you the PDFs tomorrow. I just need to confirm the year of your allroad to ensure that all the wire colors are correct. I based my post to you on the the 2001 wiring schematics. If your MY is different the colors might not match.

I can also send you the alignment procedure for your car too. PDF format of course.

[samiam]

That's a 2000 model. Does the suspension share components across model years, as I'd like to keep an eye out at the breakers if any get wrecked to pick up bags etc if they become available, anticipating the inevitable...

[davidpkw]

Hi Daft

Just seen your post to samian, i have the same fault on a 2004 UK allroad, do you know where i could get a wiring diagram to help the garage trace the fault?

Thanks davidpkw

[S/X Runner]

I can also send you the alignment procedure for your car too. PDF format of course.

Could you send me the Alignment procedure? ssargiotto at gmail dot com

Thank you.

[adam worth]

I would also like the procedure. Can you send it through a PM or to my email adress: [email protected]?
Thanks a lot and have a great day!
_______________
Adam Worth
pneu hiver
alignement roue