E61 Self levelling suspension problem

Discussion in '5 Series' started by doogie, Jun 14, 2018.

  1. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    2005 E61 47k miles

    I’ve replaced the compressor as it was noisy and becoming inefficient due to taking in dirty air due to a split intake pipe. Recently before replacement I’d noticed it had stopped working completely but having replaced the compressor and relay it still doesn’t work and the rear end is sitting too low so should be calling for air. Anyone have any ideas?
     
  2. Alan Gunn
    Offline

    Alan Gunn

    Joined:
    Feb 13, 2018
    Messages:
    34
    Likes Received:
    7
    Location:
    Anglesey
    Ratings:
    +10 / 0 / -0
    Have a look at the level sensors the connections could just want a spray of contact cleaner on them.
     
    • Like Like x 2
  3. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    Thanks Alan, I’ll have a look, but I wonder that it would be quite a coincidence that both had failed due to poor connections when they were working fine a few weeks ago?

    Maybe it’s a control unit that’s packed up as I’m guessing there probably is one there somewhere?
     
  4. Richyroos
    Offline

    Richyroos

    Joined:
    Feb 28, 2018
    Messages:
    88
    Likes Received:
    19
    Ratings:
    +27 / 0 / -1
    You say it stopped working altogether, before you replaced the compressor, perhaps the motor got overloaded and blew the fuse - best to check that the fuse is OK. I assume the "new" compressor was a new one, and not a s/h one?
     
  5. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0

    The old compressor stopped working before I took it off. I checked both fuses and they are fine, installed brand new compressor and relay and the rear of the car is still sitting too low so the level sensors will be calling for air, but nothing is happening.
     
  6. slim_boy_fat
    Offline

    slim_boy_fat WARLORD Site Supporter

    Joined:
    Jul 31, 2015
    Messages:
    2,152
    Likes Received:
    608
    Ratings:
    +1,061 / 1 / -0
    It's not one of these "needs coding" jobs, is it?
     
  7. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    I don’t think so, well I hope not anyway!

    The old compressor was running noisily for some while and then I noticed that it just wasn’t running any more. I’d guessed at the time that it had just packed up working, maybe seized, but it appears that there must be something else in the system that isn’t working. It could be a control unit that runs the whole setup but I’m not certain and wouldn’t want to go down the route of replacing it unless I was certain it would solve the problem, so still a bit of head scratching to do it seems!
     
  8. snrbrtsn
    Offline

    snrbrtsn WARLORD Site Supporter

    Joined:
    Jul 30, 2015
    Messages:
    1,312
    Likes Received:
    440
    Location:
    Aberdeen
    Ratings:
    +674 / 0 / -1
    During the change of compressor
    Was the ignition switched on with the wheels off the ground, this allow times for the airbags to inflate under no load (weight)
    The normal (incorrect) procedure is to lower the car on the ground, then start up and hope the compressor lifts the car, effectively overloading and shutting down before the correct ride height is reached.... always best to inflate with no load!

    Also
    Was the solenoid block changed with the compressor or swapped over ?
    These are known to be faulty and should be changed at the same time as compressor

    Thereafter, the soapy water solution onto the airbags should prove their not perished, bubbles would indicate leaking bags

    Ps
    No coding required

    Sorry, opening questioning... I’m in a rush to do nothing thing:ROFLMAO:
     
    • Like Like x 1
  9. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0

    After fitting the new compressor the car was dropped back down and battery reconnected. I figured that once the battery was connected the level sensors would call for air and the bags would inflate but nothing at all happened, the compressor didn’t run at all. I did wonder whether this would happen as when I took the old compressor off and connected direct to power it did run, albeit a bit noisily. So I started to wonder why it had stopped running when it was on the car, something in the system isn’t telling the compressor to run. I don’t think the solenoid will be at fault as the compressor would still run regardless.I had already fitted a new relay as that was my first thing to rule out before I got the new compressor and the compressor came with a new relay too. The original solenoid is still on the car and I believe is still working.
     
  10. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0

    If the wheels were off the ground when reconnecting everything, surely the level sensors wouldn’t be calling for air as they would think the car was at the right height?
     
  11. snrbrtsn
    Offline

    snrbrtsn WARLORD Site Supporter

    Joined:
    Jul 30, 2015
    Messages:
    1,312
    Likes Received:
    440
    Location:
    Aberdeen
    Ratings:
    +674 / 0 / -1
    I’d be inclined to jack up car and switch on ignition
    Whilst the ride height sensors won’t see height the solenoid won’t see pressure either
     
    • Like Like x 1
  12. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    I
    I’ll have another look tomorrow night. I still can’t work out how it will make a difference if it’s jacked up as the wheels will be hanging a lot lower than normally so the compressor won’t be prompted to run? I could jack the car up and disconnect a level sensor to fool the car into thinking it was very low possibly. Maybe that would trigger it to work?
     
  13. markyboyt
    Offline

    markyboyt

    Joined:
    Aug 16, 2015
    Messages:
    399
    Likes Received:
    74
    Location:
    Shropshire
    Ratings:
    +121 / 0 / -0
    The filling with the car off the ground is correct but via an ISTA activation to fill the airbags. As you say if it sees the wheels hanging it will actually try and let the bags down to lower it.
     
  14. markyboyt
    Offline

    markyboyt

    Joined:
    Aug 16, 2015
    Messages:
    399
    Likes Received:
    74
    Location:
    Shropshire
    Ratings:
    +121 / 0 / -0
    Is the car pre or post facelift?
    If you’ve checked the fuse for the relay and the fuse for the ride height control unit, and are happy the relay is ok then you’ve likely got an issue with the ridde height control unit as that’s what processes the ride heights and switches the compressor relay when required. It’s in the spare wheel well under the floor carpet. On the E60’s it used to be quite common for it to become a swimming pool under there.
     
  15. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    Mine is pre facelift, October 2005 build. I’ve checked in the spare wheel well and it’s bone dry. Both fuses listed for the air suspension are fine. I’m thinking it must be the ride height sensor.

    If it was plugged into ISTA / INPA do you think that would show where the fault lies?
     
  16. Alan Gunn
    Offline

    Alan Gunn

    Joined:
    Feb 13, 2018
    Messages:
    34
    Likes Received:
    7
    Location:
    Anglesey
    Ratings:
    +10 / 0 / -0
    Did you ever check the plugs/connections on the level sensors.
     
  17. doogie
    Offline

    doogie

    Joined:
    Jun 3, 2018
    Messages:
    11
    Likes Received:
    3
    Location:
    Minster, Ramsgate, KENT
    Home Page:
    Ratings:
    +3 / 0 / -0
    Yes, everything seems fine there.
     
  18. markyboyt
    Offline

    markyboyt

    Joined:
    Aug 16, 2015
    Messages:
    399
    Likes Received:
    74
    Location:
    Shropshire
    Ratings:
    +121 / 0 / -0
    Yes ISTA would help as you could read out the ride heights as well as component activating the compressor. There’s a ride height sensor both sides so it’s unlikely both have gone faulty at the same time.
     
    • Like Like x 1

Share This Page