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Discussion Starter · #1 ·
I have recently purchased a Land Rover Discovery 3 2009 diesel model. It had a intermittent suspension fault on the dash which I knew when I bought it. I would love some help and advice to determine the source of this problem because I love this car and would love to make use of all the features.
The problem, so I have ruled out air leaks by lifting it up and taking measurements and leaving over night successfully no drop in the hight at all, the compressor does function when the fault isn't present it will work as per normal turning on and off .
The suspension fault comes on 90percent of the time and generally it will work fine first thing in the morning but after a short drive I get the amber then red light saying suspension fault limited to 30mph but I can always go faster than that, I doesn't affect the driving at all just annoying hearing the beep all the time.
Cycling the power doesn't make any difference it comes straight back.
I have tried a used compressor module to see if that's the issue but made no difference, unfortunately I don't own a scan tool or so can't see anything specific for my car suspension.
Any help or advice would be greatly appreciated, im happy to give it a go to fix myself I enjoy working on cars and love to learn more about these cars.
 

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Discussion Starter · #3 ·
If you are going to try and fix it yourself, you're going to need a scan tool. Search around, you'll probably arrive at the conclusion that the IIDTool by GAP Diagnostics is the best one on the market. Not the cheapest but for around $500 it pays for itself. Your fault sounds like one that I was having a few months ago. I believe it was due to "pressure not decreasing" when required. I have a Hitachi compressor on my '06 so the fix was a replacement of the drier. If you have an AMK compressor, I believe the same symptoms are fixed by a replacement of the solenoid valve.

You will of course want to troubleshoot it yourself, though. Don't go off my guesses!
Thanks allot for responding to my post.
Did the scan tool tell you the pressure was not releasing or did you just come to the conclusion yourself? It sounds like something I should definitely check. I'm yet to look at my compressor yet but I do k ow it works i hear it in the morning but you could be right. What would be the best way to diagnose that without just changing parts?
 

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Discussion Starter · #5 ·
Great thanks allot for the info again.
Did yours also fault stationary on startup? mine does if I have recently been for a drive. Which one is the solenoid valve you are referring to?
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Discussion Starter · #9 ·
I am looking to purchase a scan tool hopefully by the end of this week, by the sounds of it im flying blind without it.
An update now i have had the car over a week really happy with the car and the wife loves it so that's a bonus. I have noticed that every morning I start the car the suspension will work until I start driving but once I start driving the fault will be there beeping for the remainder of the day, the next morning its like it resets itself over night or it could be a symptom of the problem.
I'll post my fault codes here once I receive my scan tool.
 

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Discussion Starter · #11 ·
I was thinking about purchasing this one only because he is selling it locally hardly used and it says it reads air suspension but not sure how to know if it will calibrate the suspension, I might email the icarsoft.
Here is the link to the I930
 

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Discussion Starter · #13 ·
I sent them a email to confirm, lucky I did they said it doesn't support suspension calibration. I'm now going through OBD Australia now. Sent them the same email to confirm.
 

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Discussion Starter · #21 ·
Yeah definitely, I haven't had a chance to check the connections to the EAS controller yet but I'm thinking about taking the module out and seeing if there is a landrover specialist near me that could test it on another car, would save me allot rather that replacing and and hoping for the best.
 

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Discussion Starter · #22 ·
Update.....
I have recently replaced the EAS module was really simple, my fault has cleared but I now have a missing calibration fault.
I would love to callibrate it but my Gap tool i recently purchased doesn't have the calibration menu?? It also says limited at the top of the screen. I was told it was completely unlocked when I bought it, seems like I can't get that option. Has anyone else seen this on the Gap Tool?
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Discussion Starter · #24 ·
You were 100 percent right, I bought it used but near new with recipt but it was not transferred to my vin. I have now done that and was able to callibrate now and clear fault.
But there is something strange going on now.....
When ever I try and lower the vehicle is goes down a little then says in the dash vehicle in extended mode, then just keeps jacking the are end up really high.
I have tested all the inputs and outputs to make sure everything is the right way around with no luck.
Any ideas? im getting over this, feels like one step forward 2 steps back lol.
 

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Discussion Starter · #26 ·
Yep I think your on the money, I feel like its the rear that isn't venting properly its weird that it has only started since changing the aes module but properly because the air suspension has not been used properly for a long time.
How do you tell which compressor i have? Does it say on it?
 

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Discussion Starter · #29 ·
Thanks for the comment, I have a new AES module coming from overseas, mine has as internal fault. I was able to confirm this using a borrowed module and my Gap tool.
 

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Discussion Starter · #31 ·
Totally agree! Good maintenance is key to a reliable happy Landrover. We bought ours really cheap because it had the air suspension fault and some other tlc issues but with some time and effort its now a great family car. Well worth the effort.
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