Odd suspension problem

[csa02221862]

2000 Disco II 107,000 miles, dealer maintained for prior owner.

So I can try to help my self where is there a good description of how this air suspension works (principals of operation)? What and where are the various parts? Known common failure points?

First problem. Only very occasionally the rear end will sink after driving. Not an overnight thing. More like immediately after getting out of it. Start it and it will come right back up. Shut it off and it will stay up.

Second problem. Load it up with 5 people and bags and the left rear side only will not come up after being loaded and started and will settle further. (rides like s**t this way). Drop every one off, start it up and it comes right up. AND Load it up with it in this sunken condition and it sill not come up when started. Load it up with it running and it will stay up and self level just fine.

I thing it is a control/sensor problem, any ideas??

[jmrivera]

Hmmm...

My SLS does sink after driving - after I turn off the ignition, remove the key, and open the Driver's door... Is this what you mean by "after driving"?

According to RAVE, if you have a sensor problem, you would get an "SLS" indicator, but I do not know if this is true... Anyone know?

Anyway, here is some more info on the SLS...

Jonathan

[Disco Mike]

Sounds like it is time to go have your SLS recalibrated with a test book type scanner and you'll be fine.
Mike

[csa02221862]

Originally Posted by Disco Mike

Sounds like it is time to go have your SLS recalibrated with a test book type scanner and you'll be fine.
Mike

Would this be dealer operation or is this scanner something that should be added to the shop for my Disco?

[Disco Mike]

Some small shops have after market scanners that can handle this, you will just need to call around.
Mike

[Shawon]

I recently had the same problem on my 2001 Discovery II. One day the back just went down when it was loaded up with passengers, and yea it does drive like crap that way, you can feel every little bump and it just feels all shaky when going faster.

But yea I just took it to the dealer and they said I had a leaking air spring or bag or something with the automatic air suspension. But my warranty covered that and they fixed it up and it's been good so far.

[csa02221862]

My Disco will stay up all night in normal mode and with ORM selected before you shut it off. Its odd that it only happens with a load in the rear and only after driving off.

Is there a separate connector for the SLABS? Or does it all go to the one under the dash? For reading/reseting codes and testing?

[Britabroad]

CSA let me know if you fix it, my 2000 DII has a similar issue. Replaced both airsprings, and the truck stayed up on ORM but would sink a little overnight on standard height. After a weeks vacation it now sinks regardless of setting. Gary

[Disco Mike]

No, you have to plug into the OBD2 scanner port with a T4 or equal type of scanner.
Mike

[Britabroad]

Mike - I read on a UK website of a guy with the same issue - new airsprings, no leaks, compressor fine but only stays up on ORM setting. He seemed to think it was a problem with the solenoids in the compressor controlling the exhaust and control valves. Any thoughts ?

PS : Testbook gives no errors. thanks. Gary

[Disco Mike]

Originally Posted by Britabroad

Mike - I read on a UK website of a guy with the same issue - new airsprings, no leaks, compressor fine but only stays up on ORM setting. He seemed to think it was a problem with the solenoids in the compressor controlling the exhaust and control valves. Any thoughts ?

PS : Testbook gives no errors. thanks. Gary

So you are saying you took it to the dealer, gave them a $100 plus and they found no codes?? Did you ask them to reprogram the SLS?? If not you won't find and resolve this issue.
Mike

[bd473374]

Originally Posted by Britabroad

CSA let me know if you fix it, my 2000 DII has a similar issue. Replaced both airsprings, and the truck stayed up on ORM but would sink a little overnight on standard height. After a weeks vacation it now sinks regardless of setting. Gary

.
I had a similar problem but decided to ditch the air and fit sandard coils. I have no rear end clearance poblems even with the fixed tow hitch and if I go heavily off road the hitch contacts the ground only as much as it did with the air anyway. I had the sensors and controls muted in a five minute session with the notebook.
Good luck guys,

[csa02221862]

Note: It seems to be sinking (left side only) after about 15 min of driving (NOT standing). Could this be a slow leak only with movement of the spring causing the compressor to run until its duty cycle limit is reached? Does anyone know what this duty cycle limit is?

I'm trying to get an idea what might be going on before throwing money at it with the stealer.

[Disco Mike]

I think this is my 3rd attempted to get the point across, you can't guyess your way thru this.
If you were lucky it could be a height switch, rotate them and see if the problem switchs to the other side, if it does, it is a switch, if not, you are are to where I have been ponting you since this came up, need to get it scanned and then reprogrammed.
Mike

[csa02221862]

Mike, I'm not trying to 'guess my way out'. Yes, I'm getting it scanned. BUT, I'm trying to be as informed as possible. I like to know as much as I can about how my vehicles work as I can.