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Air suspension faults.
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3
Air suspension faults.

My D3 Commercial has been throwing suspension faults for about a year.

It started with the yellow light on the dash coming on after a couple of minutes of driving. Reading the codes I got the code for the system pressurising too slowly. We rebuilt the pump with an XR8 kit and it was fine for for about 6-8 weeks, then the light started coming on again. The same fault code was present again but it still held pressure fine, so we carried on driving it.

A couple of days ago we noticed that the suspension had dropped, so I pulled the pump off to check that it was operating properly. It ran fine and produced plenty of pressure. I re-fitted it but it wasn't running when the engine was started and suspension remained it it's lowest position. I read the codes again and got this:-

C1A27-14 (2E) Compressor circuit - General electrical failure - circuit short to ground or open
( on 19-05-2022 20:52:07 at 282460 km )

Apart from the obvious blown fuse, are there any other known problem areas to check?
  
Post #229231019th May 2022 10:36 pm
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loanrangie
 


Member Since: 18 Jun 2017
Location: Melbourne
Posts: 592

Australia 2008 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Wiring behind the LH front side guard liner is problematic for chaffing and wire breakage.
  
Post #229231720th May 2022 1:13 am
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Matty 2332
 


Member Since: 02 Dec 2008
Location: West Yorkshire
Posts: 670

United Kingdom 2006 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

Did you change the compressor relay? these can be problematic over time.
  
Post #229232220th May 2022 5:58 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

Ok. Thanks. I will check the wiring. No I haven’t changed the relay.
  
Post #229232520th May 2022 6:19 am
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

New relay coming tomorrow.
  
Post #229240820th May 2022 7:44 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

The relay was the wrong one but i changed it for the heated screen one and the compressor still didn't run.

Will check the wiring for chaffing tomorrow.
  
Post #229257021st May 2022 9:57 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

So, I have no chaffed wires in the loom behind the n/s front wheel arch-liner and the loom looks fine all along to the compressor.

There is 12 volts at the fuse but I only have 12 volts at one of the coil terminals on the relay. I would have thought that there should also be 12 volts at one of the switch terminal contacts too.
  
Post #229267822nd May 2022 9:58 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

On further investigation tonight the 60 AMP fuse has blown, so that explains the lack of power to the switch terminal on the relay. I think I am going to get a new compressor, as the motor must have caused the fuse to blow and when substituting a temporary glass 60 AMP fuse this evening, the motor doesn't sound great.

Question is, do I stick with Hitachi, or change to AMK? Can the IID tool do the software upgrade for the AMK pump?
  
Post #229277823rd May 2022 7:31 pm
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loanrangie
 


Member Since: 18 Jun 2017
Location: Melbourne
Posts: 592

Australia 2008 Discovery 3 TDV6 SE Auto Stornoway GreyDiscovery 3

Stick with a hitachi, amk is not an upgrade.
  
Post #229279123rd May 2022 10:07 pm
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GDM
 


Member Since: 18 Oct 2020
Location: Midhurst, West Sussex
Posts: 144

United Kingdom 2007 Discovery 3 TDV6 Commercial XS Manual Zambezi SilverDiscovery 3

Fitted a new Hitachi compressor and 60 amp fuse at the weekend and all seems to be well. No warning lights after a 25 mile round trip!
  
Post #229370931st May 2022 12:24 am
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