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Discussion Starter #1
My air suspension has now developed a fault. there's no way its ending up on coils(!) so I need to find out what's wrong. The symptoms: Start the RR, air suspension rises to middle setting. Followed by the high ride height warning lamp on the dash and the high ride height & low ride height button flashing repeatedly for a few seconds then going to a solid state. At higher speeds the system remains at middle height and the system isn't adjustable by the usual methods. Is there a way to diagnose the fault via reading codes? I have performed this task for an ABS fault but never for air suspension. Any help would be gratefully received!
 

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Roo said:
My air suspension has now developed a fault. there's no way its ending up on coils(!) so I need to find out what's wrong. The symptoms: Start the RR, air suspension rises to middle setting. Followed by the high ride height warning lamp on the dash and the high ride height & low ride height button flashing repeatedly for a few seconds then going to a solid state. At higher speeds the system remains at middle height and the system isn't adjustable by the usual methods. Is there a way to diagnose the fault via reading codes? I have performed this task for an ABS fault but never for air suspension. Any help would be gratefully received!
It sounds like a 'soft fault' otherwise it would sink to the bump stops and stay there :think:

You'll need some diagnostic gear, at the very least a cable and the free software; if you can get it to work for you! I went the Blackbox solutions route and had no problems, but then that isn't free :wink:
 

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I had a similar problem on my 95 swb when I purchased it last month.
It would also raise the right side while parked over night.
I got the EAS unlock suite from RSW Solutions and made a cable and followed directions.
The suspension works great now with no issues. :dance:

Cheers
Brian
 

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Roo said:
...: Start the RR, air suspension rises to middle setting. ...
does it sink on its own, or do you lower to access height to get in/out?

If it's doing it on it's own, you either have leaks or need a calibration. Since it will rise up then fault, I think you may have a duff sensor. A code read is the easiest way to diagnose the sensors.
 

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Discussion Starter #6
shupack said:
Roo said:
...: Start the RR, air suspension rises to middle setting. ...
does it sink on its own, or do you lower to access height to get in/out?

If it's doing it on it's own, you either have leaks or need a calibration. Since it will rise up then fault, I think you may have a duff sensor. A code read is the easiest way to diagnose the sensors.
A code read is in order then...

The suspension holds at height so there are no leaks at the bags, it only drops to level itself upon exiting and when restarting it raises back to standard height. In fact its sat for near two weeks at standard height as im unable to drive just now. After reading up about the system I would like to hazard a guess that I have a leak somewhere in the system. RAVE states that if there is a leak, causing the compressor to cycle too much, then the ECU will inhibit the system and fix it at standard ride height. As my compressor has increased in its operation more recently I'd like to think this is what the problem is. Make sense?! Also, is the compressor attached to the chassis via rubber bushes or something? Mine seems terribly loud when working. Id say its operating every 30 seconds. Sometimes longer, more often than not shorter intervals.
 

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yes, it's on rubber mounts, that arn't very good when new, when 15 years old they're worthless....

every 30 seconds or so is way too often, so you have a leak somewhere.
 

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Discussion Starter #9
OK, a slight update. With the generous help of Footloose4x4 I had my codes read on the LSE. The air suspension system displayed every fault code possible! So they were cleared and the process repeated with the same result. It was suggested that as the system was working 100% before the fault, I would be extremely unlucky (even with as a Range Rover owner!) that every single component on the system had failed. He pointed to the ECU as the fault. Would this be a logical guess?
I was there for around an hour and the guys were really helpful. Code read was only £20 and that was for the air suspension and engine codes.
 

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Roo said:
OK, a slight update. With the generous help of Footloose4x4 I had my codes read on the LSE. The air suspension system displayed every fault code possible! So they were cleared and the process repeated with the same result. It was suggested that as the system was working 100% before the fault, I would be extremely unlucky (even with as a Range Rover owner!) that every single component on the system had failed. He pointed to the ECU as the fault. Would this be a logical guess?
I was there for around an hour and the guys were really helpful. Code read was only £20 and that was for the air suspension and engine codes.
The air suspension ecu?
I think I may still have a spare... Interested?
 

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don't forget if you swap the ecu you will need a recalibrate the ecu as it will have the other vehicle heights coded some times they work ok and somtimes they don't
 

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Even so, i would also be checking the system for leaks and thinking about new pump/piston/seal/overhaul arrangement of some sort unless it's been done in recent memory.
 

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Discussion Starter #14
Thanks for all the advice. My first port of call will be the ECU, connections earth's etc. I might even open the ECU up and have a look for dry joints etc. as I've had previous success with an ABS ECU on a Volvo 850 (that's a common problem on those) The system was overhauled around 3 years ago with new seals etc so I would hope they will still be serviceable. As the systems at standard ride height I've been paying more attention to my manifolds and water leaks (!) but now those are done its time to review this system.
I've no idea what I used to do with my spare time pre Range Rover!!
 

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Discussion Starter #15
Well, after a general check of the more visible and accessible parts of the air system ive found an air leak.

This is part of the connection at the airbag end. It holds the plastic pipe in position and forms part of the quick connect/release system. Does anyone know if these are available?
This hasnt solved the problem however. I've had the ECU out and checked the connections with no problems founds.
 
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