D3 Discovery 3 - Suspension Problem & Hawkeye Total

lhandrover said:

Ok got an iid hooked up to the car and here are the suspension codes

Suspension

• C1A27-14 (28) Compressor circuit - General electrical failure - circuit short to ground or open
• ( at 216800 km )
• C1131-92 (68) Air supply - Component failure - performance or incorrect operation
  ( at 216830 km )
• C1A20-64 (6C) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
  ( at 216800 km )

Throughout the compressor ran fine - eventually after several minutes dashboard screen said something along the lines of it would continue when it cooled down. Compressor "sounds" good and strong. Would anyone know where the system picks up the pressure from to decide pressure is inadequate - at the pump or at the reservoir, or somewhere else. If reservoir leaks to the point pressure is not raising sufficient to satisfy the yellow dash light, would I not hear it escaping?

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hi

good u got it plugged in , what was the compressor psi or kpa plse

did they also give u the live data of the system

the pressure sensor is fitted to the reservoir valve , the air tank can leak but thats controlled when the reservoir valve open and closes

sorry , can’t remember did u pull the air tank out and pressure test it , if the air tank was leaking the compressor would indeed work overtime to try and satisfy the pressure sensor

have u replaced the relay



sorry if i’ve asked before , lol

I've emailed the report to myself but didn't know I needed to look at anything except error codes - I've got it here so can do it now. Which bit do I go into please to get the compressor info?

ok went in and looked at live values - kpa went up very quickly to 980kpa, shortly after yellow light came on and started dropping, gradually until it reached 104kpa and then stopped dropping - it stayed like that until I switched off. I looked at compressor temp and it got to 92c before it switched off. What do these figs mean in the scheme of things I wonder?

lhandrover said:

I've emailed the report to myself but didn't know I needed to look at anything except error codes - I've got it here so can do it now. Which bit do I go into please to get the compressor info?

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hi

that’s great , did u end up buying one then

if u have an ipad u can do a screenshot or send the screen to a printer

u want the live data , suspension

plus if u haven’t got one , here’s a link for the manual , easier to print it all out, think it’s 170 x odd pages

don’t go into calibration

u need to clear the faults and then redo another search for faults to see what comes back

https://www.gap-diagnostic.com/wordpress/web-ajax/download.php?f=IIDToolV3.00.pdf

lhandrover said:

ok went in and looked at live values - kpa went up very quickly to 980kpa, shortly after yellow light came on and started dropping, gradually until it reached 104kpa and then stopped dropping - it stayed like that until I switched off. I looked at compressor temp and it got to 92c before it switched off. What do these figs mean in the scheme of things I wonder?

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operating pressure is 1700 kpa

sounds like the compressor is overworking , or possibly a leak , but u should hear it seeing it won’t go any higher

so the pressure won’t build up any higher than 980kpa , so this shows the compressor is either knackered or u have a leak

can u go from access , normal then off road height

plug the iid in, then start the engine , connect to the iid, are u using a phone or ipad plse , then go live data , suspension , on the right hand side u select what u want to display , u can select up to 8 x things then u can maximise the screen on ur device , then do a screenshot, email or send to printer

to prove the compressor , u will have to remove ur airtank, lay it down and reconnect it to the pipe , start the landy , bubble test the airtank, at the top where the seam is

The faults that came up are fresh, I havent fixed anything to clear any faults so wouldnt they remain the same, or will it have changed once comp fell over?

What do you think about the kpa of 980 - thats too low isn't it, around 142psi?

I have not pressure tested the tank, wouldnt have the kit to do that either except maybe some bubble searching. However, would the tank hiss if a leak - I've put a stethasope on it and no sounds come from it. The gallery pressure drops off immediately the compressor switches off, down to 104kpa and then holds that. Is that normal?

here’s a screenshot of mine taken a little while back

yup, received your previous message after i sent mine

Can I ask, what is residual PSI and what does the second section mean where it says firmware No Exhaust previous please?

lhandrover said:

The faults that came up are fresh, I havent fixed anything to clear any faults so wouldnt they remain the same, or will it have changed once comp fell over?

What do you think about the kpa of 980 - thats too low isn't it, around 142psi?

I have not pressure tested the tank, wouldnt have the kit to do that either except maybe some bubble searching. However, would the tank hiss if a leak - I've put a stethasope on it and no sounds come from it. The gallery pressure drops off immediately the compressor switches off, down to 104kpa and then holds that. Is that normal?

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the faults could be old ones, so after reading them u search again to see what faults come up

but making note of all the faults that appear , ie select show all faults

980kpa sounds low, u don’t need any special kit to test the air tank. just take it out, reconnect it to the original pipe, then start the engine to get the compressor running again and bubble the seam, just use some washing up liquid

when the engine is turned off the reservoir valve shuts the air tank off and keeps that air in reserve , so when the compressor comes back on the reservoir valve opens the air tank,

to me that pressure is too low and sounds like a knackered compressor , but have to ensure 100% there is no leak

have to ensure to go through the fault finding process in stages and not skip any steps

hope that helps

lhandrover said:

Can I ask, what is residual PSI and what does the second section mean where it says firmware No Exhaust previous please?

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residual is what is stored with the engine off

no exhaust, think that’s older software and to be honest haven’t taken much notice but will try and find the answer for u

if u print out the manual a lot of it will become a lot clearer for u but , here if u need a hand as it can be a minefield

ok thanks. I'll have a look at that then

ps - friend lent me his iid - goes back tomoz as he is a garage so needs to use it himself but it is indeed a fascinating bit of kit, I don't have enough time to really get to grips with it but hopefully its answered a few questions today

lhandrover said:

ps - friend lent me his iid - goes back tomoz as he is a garage so needs to use it himself but it is indeed a fascinating bit of kit, I don't have enough time to really get to grips with it but hopefully its answered a few questions today

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no probs , is indeed a great bit of kit and i wouldn’t be without mine , pays for itself very quickly and can do so much , inc the ease of just printing out the results

so at least you’ve established the pressure , i was just concerned if u bought a new compressor and had a leak in the air tank it would burn the new compressor out

it looks like the compressor is knackered though and the air tanks have a habit of leaking

so if i may say , need to prove u have no leaks in the air tank, then new compressor , when fitted plse don’t forget the new relay that comes with it, if u upgrade to a different type u need a software update

Thanks.
Not having had one of these before, what is normal operation - Does the compressor run intermittently constantly, or once to selected height switch off?

lhandrover said:

Thanks.
Not having had one of these before, what is normal operation - Does the compressor run intermittently constantly, or once to selected height switch off?

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no probs, hope it’s been useful to u

when u start the engine the compressor will run until the pressure sensor in the reservoir valve senses it’s at the req pressure and if it’s at the correct height , that you’ve set it at, ie access, normal or off road, once there will switch off

as ur driving it will briefly come on and off , here and there, but difficult to tell as in the cabin u can’t hear the compressor running

it will of course come on when u select a higher setting, ie from access to normal , then onto off road height

i’ve only had mine a year and never owned a disco either before , what did u have before plse

I've had a few - a 65 series 2a, a Ninety 2.5TD, a Ninety 2.5NA, a D2 2.5td5 99 5 seater and an 04 D2 TD5 7 seater- this one was the only one that would have had air suspension but had been converted to coils before I got it. Had few problems with any of them except the 99TD5 which had fuel injection pump/turbo issue which I fixed courtesy of this site, fuel lift pump same car, leaky sunroof, same car and door actuators - same car haha. Apart from some front propshafts the others all pretty good. I drive an XF which has a similar engine to this Disco, and a Sportage 3 - touch wood never had a prob with those but newer so probably will come a time if I kept them.

what are your thoughts on the carsoft i930 for the d3 - its priced at sub £100 - have you tried one, search on here suggests it works well on freelanders but for problems as discussed in this thread I wonder?

lhandrover said:

what are your thoughts on the carsoft i930 for the d3 - its priced at sub £100 - have you tried one, search on here suggests it works well on freelanders but for problems as discussed in this thread I wonder?

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hi

i haven’t personally used that scanner , of course the gap iid is the one to buy

have seen mentioned the other scanner called foxwell , but alas don’t know what kind of live data readings they show, or what it will perform in the way of recalibrating things etc

maybe look around for reviews in the ones ur interested in, write out or print it’s capabilities to compare

Thought I'd post up the resolution - Nothing worse than dead ends to forum's eh!
It was the compressor - Replacement fitted, no bongs/lights and checked gallery pressure and went up to 1758 or 80 can't remember which, and compressor went off and didnt come back on (well for several minutes running anyway). I cleared error codes and re-ran test and no errors reported on suspension. Tests and code stuff carried out using my new 930i that arrived today. Thanks to all that replied, especially gstuart for his keeping in touch and offers to help.