Pete many thanks for the link, will try that and other ideas in the morning
GlennD3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
Today with car at low level (access level) I tried the LR button and (un)lock and also just starting the car, when the yellow icon and bong appears I then cancelled the fault C1A20 and immediately selected normal ride height, the compressor runs a bit longer but there is no raising of the car and code C1131 is given - Air supply component failure - if I cancel the C1131 the engine will continue running and no new code is given until I open and close the drivers door when the air pump starts running again and only code C1A20 re-appears.
C1131 only appears when trying to force the ride height with the selector on the console, I took the rear wheel off and visually checked the rear valve block, as there is no air in the system it's pointless in trying the soapy water for leaks, all I can think of next is to do a visual of the front valve block and check the plug for ingress of water then remove the nearside front wheel arch panel to look at the 3 plugs that have caused people issues.D3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
7th Mar 2024 2:21 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10773
I would look at the live value for the air gallery pressure.
See if the sensor is dud (or wiring fault) or if it shows signs of increasing when compressor runs.
I like to dream that using the key to raise the suspension bypasses some of the fault checking. And helps with diagnostics as you can hear the valve blocks clicking
Hi Pete,
with the new middle valve block fitted, Gallery Pressure is 92 kpa at rest and when the pump started to run the reading increased to 124 kpa after which the yellow dash light illuminated for suspension issue C1A20 back on the fault list and Gallery Pressure drops to 92kpa, which was about the same on the old valve block, the new V Block comes with a new sensor.
GlennD3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
7th Mar 2024 3:35 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10773
On the face of it, that doesn’t look much of an increase, does it?
Thoughts for you :
How does that kpa convert to what you saw on your gauge?
Maybe the compressor is duff and needs a new piston. Or the lid cracked ?
when I monitor the compressor output with a gauge into the blue port, just after a few seconds I read 20 bar and it would go higher if I left it running, I ran the compressor by bridging 2 contacts at relay 7, from what I've read Land Rover look for about 17 bar out from the compressor.
so 20 bar into the valve block but nothing monitored on the gauge from valve block to the air tank, it's as if something is preventing the solenoids in the valve block from opening the port/ ports.
If I had a leaking pipe or faulty valve block I'm sure the soapy water test would shown something, one thing I have not checked is could the system have gone into transport / restricted mode and I need to enable something, that's what I will check after tea on the nanocomD3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
7th Mar 2024 4:32 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10773
20 psi is 138 kpa (so about right)
20 bar is 2000 kpa
Transport mode etc is usually indicated by a red suspension light
7th Mar 2024 5:47 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10773
My gallery pressure is:
20 psi for a car that’s been parked up for months
~140 psi when pump run via key. (And this pressure is held) Varries alot. But in the 100s psi range
I do wonder if 20 psi in the minimum value that can be displayed. And this effectively means empty or no pressure
Update, the issue is now resolved,
having added a new air tank, middle Valve block, new sections of air pipe using High Pressure push fit connectors (80bar), testing the pump output with a gauge and still having the C1A20 fault code, I decided to start looking at the front and rear valve blocks, first was the front valve block (which had been replaced before I bought the car), picture below shows culprit being the RHF air-spring pipe had been blown out of the Voss connector
Click image to enlarge
I replaced the faulty Voss with a push fit connector but left the others in place, then fired up the car and no fault lights on the dash the pump filling up the air tank, I could see the gallery pressure rising on the Nanocom. After 30 seconds I switched off the engine and checked all the new push fit connectors along with existing connectors for leaks, soapy water test, I did find a small leak which was the push fit on the tank in place of the Voss connector, so I will redo that over the weekend between the rain showers, glad I did not buy a replacement air pump, it was a bit crappy doing this job outside in the cold weather, as I am in-between houses I have no garage, but learned a little bit more, thanks to Pete K for all his help
does anyone know the exact thread size and type (Imperial, BSP, BSPP ?) used for the Voss connector?D3 4.4 V8 2005 sadly now gone
Freelander 2 i6 HSE now gone was a very good 4x4
Triumph TR8
8th Mar 2024 8:15 pm
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1826
Check with GStuart as to where to get these but they are better than the Voss connector.
"6mm x M10x1 Metric Thread 80 BAR HP Brass Push Fit Straight Stud Fitting" I did have a picture but currently it has gone AWOL
12th Apr 2024 10:16 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1826
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