Member Since: 26 Apr 2024
Location: Lincs
Posts: 3
Disco 3 air suspension issues
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Hello all,
I have a 2006/7 disco 3 which has an amber warning light on the dash. It looks like a picture of a truck with up/down and side to side arrows, I’m assuming this is the air suspension light?
I get a c1a20-64 code “pressure increases too slow when filling reservoir”
The vehicle suspension doesn’t sink at all over time and will lift and lower for the first 30 secs or so till the the ping and warning light come on.
I’ve attached a screenshot of the measured pressure in the reservoir. Rises quickly after start, peaks around 1300 and then drops off rapidly once the warning light comes on and the compressor cuts out. Quite quickly drops down to 600 and sits around 200 if left for a few hours.
After reading through a fair few posts on here I’m thinking I’ll check the reservoir for holes first. Is there anything else that should be high on my list?
Typically mot is just around the corner and I’m not sure it will pass with that amber light under the new rules?
And I’d like to fix it anyway!
Any help greatly appreciated
7th Oct 2024 9:47 pm
Jamiehol
Member Since: 13 Nov 2015
Location: Ipswich
Posts: 392
Deffinitley worth checking the reservoirs for leak but I’d also factor in a rebuild of the compressor and drier.
8th Oct 2024 5:58 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14172
Plus 1 ^^^^
Compressor should produce around 1780 Kpa , hopefully it’s not full of white silica dust as that can sometimes go round the system causing problems , ie valve block seals etc
As a side note if I may plse add, see ur battery is reading around 11.9 Vdc , should read a min of 12.6 Vdc as low batteries can cause all sorts of problems
Could do with an overnight charge but of course won’t effect the suspension results
Hope that also helps u
8th Oct 2024 6:09 am
Stevies205
Member Since: 26 Apr 2024
Location: Lincs
Posts: 3
Thanks for the replies. Compressor rebuild was on my radar from reading through other posts. My logic was working along the lines of the pressure in the reservoir dropping so quickly once the compressor stops that there must be a leak but maybe I haven’t considered everything.
The battery voltage is an interesting point and I posted the screenshot wondering if anyone would mention it. The vehicle has had a new battery as the vehicle had been stood for a while and had all sorts of random faults which others suggested would disappear once the battery voltage was sorted. Some of these faults did go away so I was surprised to see it that low again. The truck isn’t being used that regularly which maybe isn’t helping. Always seems to crank well though.
9th Oct 2024 8:23 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14172
Ur so very welcome
Indeed the hiss is the exhaust valve opening as it drops the pressure as its not required to be held at the higher pressure until the engine is restarted
Does look like the compressor may need a rebuild, main issue are the dryer material gets old and turns to dust , therefore blocks the compressor from working as it can’t pull in outside air with the dryer filters etc block up , easy to remove compressor , sometimes there too far gone and need replacing
Plse don’t be tempted to buy a cheap Chinese copy
Advanced factors are very good if after rebuilding it doesn’t work and need a new one , personally bought a Dunlop , along with a new bracket rubber supports and used stainless steel nuts and bolts
Have enclosed the chart and wiring diagram for u , plus some further links of how the suspension works
Alas these are very power hungry so even leaving the door open with the lights on for several, hours can take amps out the battery
If u have a 12s towing socket u can charge ur main battery via that , personally use a CTEK charger and fitted a power socket on my house , drilled through the wall where my charger is plugged in
U can also get a cheap battery monitor off eBay, Amazon etc , called a BM2 , there Bluetooth to ur phone so u can keep an eye on ur main battery, however range is only around 20’
If u wish to turn ur interior lights off press the centre button on the front overhead light for around 5 x seconds, ur then see on the instrument panel , lights off, just repeat to turn them back on
Many of us convert them to led , plse ensure the surround of the bulb isn’t metal as it can fuse out the light , plse don’t ask me how I know, lol
Hope that also helps u and plenty of us here if u get stuck
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Last edited by gstuart on 12th Oct 2024 3:05 am. Edited 2 times in total
12th Oct 2024 2:45 am
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14172
Meant to add there’s an easy test that u can carry out ref suspension dropping overnight
Put the disco into normal ride height , measure from the centre of the wheels to the bottom of the wheel arch liner in mm , can put masking tape on the centre caps and draw a line if u wish so then u get ur tape back on the same spot
Fronts 466mm
Rears 485mm
After taking note of the mm measurements, u remove the fuse F26 from the engines fuse box
Then leave it overnight , re measure the heights in the morning to see if maybe one corner has dropped or side etc
On re installing the fuse plse be careful as the body will drop very quickly
As a safety note plse don’t ever get under the disco without placing an axle stand there first
Hope that’s also useful to u and plse let us know how u get on
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