Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
Air suspension
Having a bit of an issue with my air suspension.
I have replaced the compressor (hitachi type) with a new one. The car was running perfect for about a week or so the suspension would go up and down no problem and then the dreaded amber light came back on and "suspension fault" message appeared again.
The compressor runs for a minute or so and then cuts out. The car is now sitting on the bump stops and won't raise at all.
I have stripped all 3 valve blocks and cleaned them. There was no white powder in any valve blocks. I am also getting pressure to all valve blocks.
The code that keeps coming back is C1131-92.
I have read the live data and am getting about 335KPA of pressure when the compressor is running. Can anyone point me in the right direction?
26th Jul 2021 5:27 pm
KevinD3
Member Since: 05 Aug 2020
Location: Sutton Coldfield
Posts: 1269
You should be getting about 13,000-14,000 map from the compressor.
Did you replace your Hitachi for another Hitachi oem or a cheaper copy? Worth taking the air intake pipe off the compressor and reading the pressure / codes again, may be a blockage in your intake pipe or intake filter behind the rear light fitting.2008 HSE Stornoway Grey
My Wife thinks the D3 is a hobby, The D3 thinks the wife is 💕
26th Jul 2021 7:43 pm
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
It is a cheaper copy. It was the same make as the one I replaced but I'm guessing it has replaced before I owned the car.
Removing the intake pipes has not made any difference to the pressure and its still the same code coming back
26th Jul 2021 8:23 pm
KevinD3
Member Since: 05 Aug 2020
Location: Sutton Coldfield
Posts: 1269
Did it come with a fresh dryer and desiccant or did you re-use the old one?
If it’s not the intake you’ll have to start checking the system, schematic diagram below, and link to compressor workshop manual here on the site, it’s document 204-05
The pressure sensor is straight after the compressor so if it’s reading low, issue should be early on in the run.
Click image to enlarge
2008 HSE Stornoway Grey
My Wife thinks the D3 is a hobby, The D3 thinks the wife is 💕
26th Jul 2021 8:43 pm
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
It was a full unit I replaced, So new dryer and dessicant.
Thanks for that, I'll have a read through the compressor manual.
I have already sprayed the pipes and all with soapy water but can't see any leaks.
26th Jul 2021 8:53 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5016
If you fill out your profile it will be much easier for members to offer assistance.
Model, year, manual/auto, etc, but cheap compressors won't last!! In any case I suspect your problem lies elsewhere, either that or you have more than one issue.yµ (idµ - eAµ) ψ=mψ
26th Jul 2021 11:53 pm
gstuart
Member Since: 21 Oct 2016
Location: kent
Posts: 14066
Hi
Plus 1: what’s already been mention, Have u also checked the relay and compressors live at the connector to ensure power isn’t switching on and off to or on the compressor , if it is doing that it might not be able build up enough pressure ?
Test both sides of the compressors connector with a multimeter to also ensure power is travelling through it on both sides , also see if the compressors motor is getting hot
Hope that also helps
Plse let us know how u get on
27th Jul 2021 12:10 am
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
Hi everyone, me again.
Replaced the compressor with an original land rover one.
I now have no fault codes but the front will not raise at all. The rear seems fine at least.
I replaced the front height sensor rubber piece connecting the sensor to the chassis because it was broken and I seem to be getting strange readings.
Front left 91mm
Front right -68mm
Rear left -43mm
Rear right -24 mm
Does it look like I need the height calibrated?
12th Aug 2021 12:04 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1812
Looks like the whole lot need a calibration as they should be close to one another
14th Aug 2021 3:52 am
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
Hi everyone.
I haven't managed to get very far with the disco due to work commitments etc.
Managed to get a look tonight briefly, here is how it went.
What I did.
Connected my pressure gauge straight to the compressor and there was plenty. The gauge only measures up to 12 bar and it was way past that.
Connected my pressure sensor to the reservoir valve block for the rear feed and I got the same result. Lots of pressure and past the 12 bar easily.
I then connected it to the front feed from the reservoir valve block and it is only getting to about 8 bar and the disco then logs the fault c1131-92 and shuts off the compressor.
Does anyone have any incline to why it is low to the front feed?
I have changed the valve block and pressure sensor and there was no change.
Sorry to bump an old thread but didn't want to start another for the same issue
20th Sep 2021 10:07 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1812
That error usually indicates that it cannot pressurise the gallery. This could be due to "pinched" pipe, a leak etc to the front. It has also been due to the "intake" pipe but you indicate rear is okay.
20th Sep 2021 11:20 pm
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
I have sprayed all pipes for leaks and can't see anything.
If I remove fuse 26 the rear stays up no problem. Doesn't drop at all.
I don't really understand how the pressure at the reservoir valve block can be so low. I'm screwing the pressure gauge directly into the reservoir valve block so there is no front pipework involved.
20th Sep 2021 11:30 pm
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
Does the compressor fill the rear bags and then open the valve?
Could there be a leak in the rear and I'm losing pressure after the bags are filled?
21st Sep 2021 9:12 am
Fraserh26
Member Since: 03 Jan 2021
Location: Walston, South Lanarkshire
Posts: 10
FIXED
Hi everyone thanks for all of your help.
It turned out the rear valve block was the problem.
One of the valves seemed a bit sticky. I'm guessing this wasn't fully opening and causing the low pressure to the front. It also could have been a seal. I removed and greased them slightly put it all back together and the front lifted no problem.
Thanks again for everyone's help. It is appreciated. Great forum 👍
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