Disco 3 (LR3) Suspension woes

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COLIN GARDNER

Member
Posts
11
Location
MURTHLY, PERTH SCOTLAND
I have a 2005 Disco3 which is proving to be a headache. I am a retired mechanic but have no real experience of modern systems. Kept getting amber light and normal suspension height only. Plugged in my Hawkeye which I bought recently and got the normal code for a compressor not giving enough pressure quickly enough. It had been converted to an AMK compressor in 2012. I bought a new AMK and pipework + relay and fitted the kit. I now still have the same fault even with new compressor and doing a live reading on Hawkeye gives me a max pressure of 206kpa which is no use and drops away when engine switched off. The suspension rises ok at rear eventually but takes forever at front. Anyone got any ideas apart from a box of matches
 
I have a 2005 Disco3 which is proving to be a headache. I am a retired mechanic but have no real experience of modern systems. Kept getting amber light and normal suspension height only. Plugged in my Hawkeye which I bought recently and got the normal code for a compressor not giving enough pressure quickly enough. It had been converted to an AMK compressor in 2012. I bought a new AMK and pipework + relay and fitted the kit. I now still have the same fault even with new compressor and doing a live reading on Hawkeye gives me a max pressure of 206kpa which is no use and drops away when engine switched off. The suspension rises ok at rear eventually but takes forever at front. Anyone got any ideas apart from a box of matches
Hawkeye code is C1A20 pressure increase to slow
 
Hawkeye code is C1A20 pressure increase to slow
A bit rudimentary but it's only one code like that unfortunately it seems that Hawkeye builders were not 100 % accurate cos that's not the complete code, scroll down to the code in the attachment which actually should have been C1A2064 and you have all the possible causes revealed there but IMO a more sophisticated tool like GapIID is needed to run the specific diagnostic procedures as to find the fault. Though at least you have some more hints there..Good luck
 

Attachments

  • D3 suspension diagnostics.pdf
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Had an afternoon on the car and removed air tank which had a load of rusty water in it but no pressure. To say the tank is rotten is an understatement so will have to replace. Also air valve at tank has had water ingress and is not working, pressure switch is also u/s. More bits to find
 
A bit rudimentary but it's only one code like that unfortunately it seems that Hawkeye builders were not 100 % accurate cos that's not the complete code, scroll down to the code in the attachment which actually should have been C1A2064 and you have all the possible causes revealed there but IMO a more sophisticated tool like GapIID is needed to run the specific diagnostic procedures as to find the fault. Though at least you have some more hints there..Good luck
Thanks for link found loads of faults due to it.
 
I have now replaced the air receiver and adjacent valve assembly. Suspension now rises and shows 1780 kpa pressure, result. However had an intermittent fault before Code C1A31 01 Front left corner valve electrical monitor general electrical failure. Strange it was intermittent! I have replaced the front valve but fault still coming up. Need to check wiring loom to valve now for breaks/bad connections. Anyone had problems with this part of loom before maybe point me in direction of where to check?. Thanks for help so far.
 
I could be wrong here but think front valve is drivers side in the front of the arch behind the liner, Ive had foglight wires rub through there and short out on the chassis.
 
I now have fully functioning suspension at last. The suspension wiring loom behind wing liner on passenger side was found to be the problem. Three of the wires on the grey plug had chaffed and corroded causing the problem. New wires soldered in and heatshink covered. Result


I put some neoprene foam on the chassis where the loom touched to stop this happening as it looked like a problem just wating to happen.
 
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