Member Since: 24 May 2013
Location: Wales
Posts: 20
Only Normal Height Available
We're occaisionally seeing this on the dash when driving, it's gone when next starting and might not pop back for weeks.
Reading suspension fault codes with Lynx gives-
Code Description
C-1A05 Rear Left Height Sensor Signal - Alignment or adjustment incorrect
C-1A06 Rear Right Height Sensor Signal - Alignment or adjustment incorrect
C-1A05 Rear Left Height Sensor Signal - Circuit voltage out of range
C-1A20 Pressure Increases Too Slowly - Signal plausibility failure
We have 204 pages of Discovery 4 2009 - 2012 Fault Codes, but can't find any of the above descriptions in it anywhere.
There are some C1A06 codes in the Headlamp Control Module A (HCM) section, but none with the above description
Nowhere in the 204 pages is there anything about C-1ao5 or C-1A20.
Is there a full fault code list out there anywhere... be nice to know what we're needing to fix
NJSSAm I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
1st Apr 2016 3:14 pm
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
Well it's not finding them, maybe that's the same list I have-
Search results for: C-1A20
Nothing Found
Sorry, no posts matched your criteria. Please try another search
Search results for: C-1A05
Nothing Found
Sorry, no posts matched your criteria. Please try another search
1st Apr 2016 3:22 pm
shepheam
Member Since: 18 Feb 2016
Location: Milton Keynes
Posts: 45
Search for 1A06 etc. It will show results containing '1A06'.
1st Apr 2016 3:44 pm
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
OK, it finds it, but with less information than Lynx provided, and nothing like the fault code list I have-
Click image to enlarge
Problem is my "comprehensive" list doesn't seem complete and is missing details of the codes.
I am sure we would be grateful if you would upload your "comprehensive" list, so others can benefit, and hopefully add to it for you.
NJSSAm I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
1st Apr 2016 4:44 pm
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
It's a 204 page pdf and it looks like a scan of an official Land Rover document.
Not sure where my husband got it from.
1st Apr 2016 5:05 pm
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
Looks like it's part of the official D4 2009 - 2012 Service manual.
1st Apr 2016 6:13 pm
RUNJ
Member Since: 31 Mar 2010
Location: Mansfield
Posts: 27
I have occassional normal height only warnings that clear when the car is restarted. By pure chance, i got talking to a bloke wearing a JLR t-shirt who stepped out of a new RRS. He happened to be on the air suspension team, so i mentioned my situation and the fact that the dealer had told me i would need a new compressor. He said that is not the case and that the compressor exhaust point can temporarily stick.
4th Apr 2016 12:02 am
Pedros
Member Since: 25 Jun 2011
Location: Cumbria
Posts: 454
It could well be the compressor too though. Mine had a similar fault that would disappear when I re-started, but as time progressed it was becoming more frequent. Thankfully under warranty the compressor was changed and there's no more problems. I believe the earlier D4's had a compressor that was less reliable than later ones.
4th Apr 2016 2:08 am
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
RUNJ wrote:
I have occassional normal height only warnings that clear when the car is restarted. By pure chance, i got talking to a bloke wearing a JLR t-shirt who stepped out of a new RRS. He happened to be on the air suspension team, so i mentioned my situation and the fact that the dealer had told me i would need a new compressor. He said that is not the case and that the compressor exhaust point can temporarily stick.
That's interesting, did he say how to check and fix if that is the case?
4th Apr 2016 9:37 am
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
OK, so IID tool has arrived and we get-
C-1A20-64(68) Pressure Increases Too Slowly when filling reservoir
From that.
4th Apr 2016 1:10 pm
Iain78
Member Since: 11 Nov 2015
Location: Durham
Posts: 63
I've had the same problem. Have a look to see which compressor is fitted, if it is the older Hitachi compressor, there could be a small crack in the dryer cover which will be leaking the air out. I had to replace my compressor with an AMK one in the end as I kept getting the same C1A20 codes. No problems since changing the compressor.AMK compressor, 4x4 info screen
4th Apr 2016 2:11 pm
fullbore
Member Since: 24 May 2013
Location: Wales
Posts: 20
Quote:
I had to replace my compressor with an AMK one in the end
According to TECHNICAL BULLETIN LTB00420v2 the suspension ECU will need reprogramming if that is done-
39. CAUTION: SDD must be loaded with DVD131.07 calibration file 118 loaded or later.
Connect a Land Rover approved battery conditioner/power supply to the vehicle.
40. Connect SDD to the vehicle and begin a new diagnostic session, by reading the VIN for the current vehicle and
initiating the data collect sequence.
41. Select Service Functions session type.
42. Run Air suspension - Air suspension compressor replacement.
43. When all tasks are complete, exit the current session by selecting the Session tab and then selecting the Close
Session option.
44. Disconnect SDD and the Land Rover approved battery conditioner/power supply
4th Apr 2016 2:47 pm
Iain78
Member Since: 11 Nov 2015
Location: Durham
Posts: 63
ECU software was changed from hitachi to AMKAMK compressor, 4x4 info screen
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