Disco 3 (LR3) Suspension woes

COLIN GARDNER · Oct 31, 2018

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

sierrafery · Oct 31, 2018

Probably the valve block, what's the EXACT fault code description?

COLIN GARDNER · Oct 31, 2018

COLIN GARDNER said:
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

COLIN GARDNER · Oct 31, 2018

COLIN GARDNER said:
Hawkeye code is C1A20 pressure increase to slow

Also which valve block as already replaced front one.

lynall · Oct 31, 2018

Have you checked the air tank for leaks?

johnlad · Oct 31, 2018

More likely airbags if there still the original ones.

COLIN GARDNER · Oct 31, 2018

johnlad said:
More likely airbags if there still the original ones.

Not Airbags

johnlad · Oct 31, 2018

COLIN GARDNER said:
Not Airbags

Do you want to expand on that

sierrafery · Nov 1, 2018

COLIN GARDNER said:
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

COLIN GARDNER · Nov 1, 2018

johnlad said:
Do you want to expand on that

All been replaced in last 18 months

COLIN GARDNER · Nov 1, 2018

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

COLIN GARDNER · Nov 1, 2018

sierrafery said:
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.

COLIN GARDNER · Nov 3, 2018

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.

lynall · Nov 4, 2018

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.

COLIN GARDNER · Nov 7, 2018

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

sierrafery · Nov 7, 2018

Well done... congratulations for your insistence

lynall · Nov 8, 2018

COLIN GARDNER said:
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.

Disco 3 (LR3) Suspension woes

COLIN GARDNER

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