Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
  
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Following the dreaded warning message "Normal Height Only Available" I have been testing my air suspension using the IID tool and viewing the live values for Gallery Pressure and Motor Temperature.
Noted the following readings and behaviour...
Gallery Pressure 1270 kPa - compressor motor temperature hits 128 degrees C and the compressor stops (motor overheat condition).
Gallery Pressure drops rapidly to 143 kPa, compressor temperature cools to 105 degrees C and compressor restarts.
Gallery Pressure increases slowly to 1394 kPa until the temperature hits 128 degrees C and the compressor stops.
Gallery Pressure drops rapidly to 148 kPa, compressor temperature cools to 105 degrees C and compressor restarts.
Gallery Pressure increases slowly to 1496 kPa until the temperature hits 128 degrees C and the compressor stops.
Question is should the gallery pressure drop so much when the compressor stops?
Also after completing the test, I was stood by the side of the car and as the compressor stopped the rear suspension dropped suddenly by about 25mm, I have witnessed this sudden dropping of the rear suspension on a few occasions, typically when sitting at traffic lights.
Any thoughts what might cause this behaviour? Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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 25th Jul 2019 10:50 am |
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Littlewill
Member Since: 14 Sep 2015
Location: Lincolnshire
Posts: 484
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I've literally had this same thing this week. Spoke to Land rover and they have identified there to be an air leak in my air cylinder (holds compressed air for the height adjustments etc) This is preventing the pump building pressure correctly but is not a "serious" failure of the pump so it still allows normal driving. The pump cuts out to prevent it cooking its self. I would get some soapy water and soak your air tank whilst the pump is running this will identify if it is the same issue as mine.
hope that helps
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| 25th Jul 2019 12:30 pm |
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M3bobby
Member Since: 21 May 2018
Location: Sleaford, LINCS.
Posts: 857
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How olds your car? It does sound like your tank has a hole.
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| 25th Jul 2019 12:35 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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First registered in October 2016, so less than 3 years old.
I will try the soapy water test and report back Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 25th Jul 2019 1:34 pm |
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Littlewill
Member Since: 14 Sep 2015
Location: Lincolnshire
Posts: 484
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If its still under warranty take it back?
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| 25th Jul 2019 1:36 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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Yes, I will when and if I can track down the fault, the reason being its a 65 miles journey to the dealership (130 miles both ways) and I can see this being a multi 'try it and see' type of episode.
Also, I am intrigued to discover the fault myself. Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 25th Jul 2019 2:34 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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The soapy water test did not reveal any leaks, I even took the cover off the compressor and sprayed soapy water all over that and the adjacent valves/pipes, nothing.
I am thinking maybe the rear valve block has a sticking valve, does that make sense to anyone else? Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 25th Jul 2019 3:08 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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"Question is should the gallery pressure drop so much when the compressor stops?"
I think the answer is Yes.
I think the pressure is vented from the compressor piston head so that it does not get locked down which enables the motor to start without undue resistance.
I noted that when the compressor restarted the gallery pressure would instantly resume to its previous 'High Pressure' level.
So assuming my theory about the gallery pressure dropping is correct, it would appear I have no leaks in the system, maybe I will find something amiss with the rear valve block when I get it off the car. Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 25th Jul 2019 4:50 pm |
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Brucey
Member Since: 24 Oct 2015
Location: Bedfordshire
Posts: 137
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Yes you are correct with your theory with the pressure drop when the compressor stops.
Good luck finding your leak. One thing to try is pulling fuse 26 in the engine bay (that kills the suspension ECU and all the self leveling functions) park the car for 12-24 hours and see if the car drops.
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| 25th Jul 2019 5:01 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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Thanks for confirming my theory Brucey.
I could find nothing wrong with the rear valve block so it looks like the AMK compressor is at fault? Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 25th Jul 2019 7:48 pm |
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Pedros
Member Since: 25 Jun 2011
Location: Cumbria
Posts: 454
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It might be a "try and see" thing, but I suspect most dealers will have the experience to diagnose this pretty well on the spot. Compressors do fail and if you're under warranty, then having a new one chucked on can only be good. A bit of future-proofing for you.
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| 25th Jul 2019 10:31 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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 Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 26th Jul 2019 5:51 am |
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johnmd
Member Since: 11 Dec 2017
Location: Glasgow
Posts: 3
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Not sure if it's the same issue but I coincidentally have a fault in Zanzibar Landmark which the dealer hasn't been able to diagnose.
1. Suspension fault occasionally flags on dash
2. Suspension sometimes does not respond to up or down request
3. Suspension sometimes will not lower or raise, with no fault showing on dash
4. Often, when at a stop, for instance at traffic lights, the driver side front noticeably drops
5. Sometimes the front takes much longer to raise than the back.
Has been in for a couple of days and they can find no fault, but replaced the front valve block (I think) as it was dropping overnight, with battery plugged in (but didn't move with battery unplugged).
I'm waiting for it to catastrophically fail when it's out of warranty tbh.
It already had a replacement compressor around September last year.
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| 4th Aug 2019 6:54 pm |
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Weyboat
Member Since: 13 Apr 2018
Location: Weymouth
Posts: 273
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Quote:Often, when at a stop, for instance at traffic lights, the driver side front noticeably drops
For me, it is the driver's side rear that drops, although since cleaning and refitting the rear valve block it has been behaving itself. Gone 2016 Landmark D4
Current 2015 HSE D4 - AKA - 'Gandalf the Grey'
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| 4th Aug 2019 8:13 pm |
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