Hi
If you have a diagnostic tool that supports live values, you should be able to watch the gallery pressure drop (exhaust valve opening) just before the air compressor starts. You can force the air compressor to start by calling for a height change. The exhaust valve vents the gallery pressure to allow the air compressor to start up more easily.
U can get rebuild kits , managed to find a link for u, that’s if it’s an AMK and not a hitachi or Dunlop, but of course need to ensure voltage is getting to the exhaust valve before changing anything
Need to also ensure the dryer silica hasn’t blocked up the internal filters or material
4x4airseals.com
Ref C1A70, plse check the wires and connector pins at that height sensor to ensure there’s no breaks or dirty contacts
Hopefully the code reader via live data would give u the supply voltage
Hope that helps u
If you have a diagnostic tool that supports live values, you should be able to watch the gallery pressure drop (exhaust valve opening) just before the air compressor starts. You can force the air compressor to start by calling for a height change. The exhaust valve vents the gallery pressure to allow the air compressor to start up more easily.
U can get rebuild kits , managed to find a link for u, that’s if it’s an AMK and not a hitachi or Dunlop, but of course need to ensure voltage is getting to the exhaust valve before changing anything
Need to also ensure the dryer silica hasn’t blocked up the internal filters or material
Amk Air Dryer Master Filtration Kit including Exhaust electrical solenoid related to Land Rover C1A13 & C1A20 trouble codes - 4x4 Air Seals
4x4AirSeals is a small manufacturing business in the UK specializing in the supply and manufacture of Air suspension products, we have been providing products for our customers for many years, this experience goes directly into all of our products which we feel is very important ,we are a hands...
4x4airseals.com
Ref C1A70, plse check the wires and connector pins at that height sensor to ensure there’s no breaks or dirty contacts
Hopefully the code reader via live data would give u the supply voltage
Hope that helps u
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amazing thanks ,I've got the compressor case off and the brackets so corroded it's split piece missing too video attached and photo of details on compressor all that's on it if you know what type of compress it is from the details that would be a great help so I know which exact fixings kit I'd need ,thanks very much for all your help were very grateful!
Bought new Hitachi pump bracket bolts case , fitted and bye bye fault ! Then with the rear height sensor was about to change and seen the green wire corroded and snapped off , picked away at plastic as didn't and can't wait for new one soldered new into fresh clean wire deeper down ,shrink wrapped and will reconnect in bit should sort that out for now at least and all fine ,up and down she goes ! Faster than ever 
, the new really they sent was causing the pump to stay on changed to another and it cuts off as should , been a busy day still got to reconnect this will change anyway too now , is it right I disconnected negative before unplugging sensor I won't need to bother recalibration or shall I just do it anyway , thanks all once again family's grateful as can get our special little man to his appointments again ,if can ever help in any way just message I be glad to , best wishes Tony and family 
