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Disco 2 SLS Compressor cycles right after turning engine off

Discussion in 'Land Rover Discovery' started by Detroit Disco, Mar 19, 2019.

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  1. Detroit Disco

    Detroit Disco New Member

    Nov 5, 2018
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    Czech Republic
    Recently my SLS compressor has cycled +/- 3 times immediately after turning the engine off. The cycles are about 1 second on / 1 second off. The sound is identical to the sound / cycle made if I use a Nanocom to test cycle the compressor in the driveway with the engine off.

    Question 1: This hasn't always occurred, why is it happening now?
    Question 2: The SLS system seems to move up and down pretty frequently whilst driving around town. I replaced the bags about a month ago and everything else functions normally (eg. load up with 6 people, no problem. Leave for a week - no leaks). Shouldn't there be some sort of lag circuit - so that the computer adjusts the height only if the position has changed for 10, 15, 30, ?? seconds?

  2. sierrafery

    sierrafery Well-Known Member

    Jun 30, 2007
    Likes Received:
    West of Transylvania
    That's a SLABS ECU missbehaviour, it happens but it's not normal, the only normal thing for the SLS is to lower a bit after the ignition was off and load removed from the vehicle.. the compressor is not supposed to work with ignitiion off whatsoever... even if it happens quite often... you'll not like that but unfortunately the only cure is to replace the ECU
  3. iansoady

    iansoady Active Member

    Oct 11, 2006
    Likes Received:
    Mine occasionally makes that noise and has done for 9 years. The only problem was when the relay welded its contacts together so I had to remove the fusible link to stop it!

    Mine also adjusts the height sometimes when stopped at lights etc if there is an appreciable side slope. Again, I don't worry about it. I have an LED fitted to see when the compressor is on.

    As Fery says, there's always a "sigh" when I unload the back - eg people getting out, stuff out of the boot. The compressor usually comes on for a short while when I start up again.
    Shimsteriom likes this.
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