T

TheDoctor

Member
Hi, I wonder if there are any Air suspension Gurus out there you might be able to shed some light on my problem. It started with the left air bag popping and the car sunk. I limped it home and replaced the strut. I had then had the fault codes cleared and it rose again with few issues bar it took a long time to reach off road height. One week later I found out why because the right side also had a leak which was being masked in the lower height. So I replaced the right strut and borrowed a mates Autoboss V30 to reset the codes once again. The Autoboss could not connect to the EHC under the Range Rover section but they advised me to go in via the BMW X5 which connected fine. I did this and reset the ride height but this only allows you to do this by axle and not corner. However as the system lets you lift or raise each corner first you can get it all level and then set. All good again until I then got a recurring error of Activity plausibility, front right. As there is a diagnostic section in the Autoboss I could see the voltages coming from each sensor. All of them were around the 3 volts mark and altered up or down as the vehicle moved over various bumps. However under the diagnostic section you can also see how much each corner deviates from the set height of zero. Each corner deviated up or down against zero except for the front right which showed no deviation whatsoever and stayed at zero. I swapped over the front sensors to check if it was this but the same thing happened with the right corner only. I also checked the three wires from the EHC module to the front right sensor but could find no faults or grounds. The live only shows 5 volts when live but I not sure if this is right.
My thoughts are now either five volts is an error, there is a problem with the module, or I might get more success setting each corner with textbook or another diagnostic tool. Sorry for the long post and any help would be much appreciated.
 
Depending on the year of your car the All Comms is great for diagnosing and clearing faults and can also calibrate the air suspension heights
 
Thanks I will see if I can track one down. I see your in Kent but do you happen to know anyone around either Leicester or Exeter who might have one? Cheers.
 
The Allcomms works on the 04 plate which is what i have also, by textbook i guess you mean the landrover T4 testbook which is fine if you have £100 / hr to spare. The Allcomms has been designed specifically for your model by a computer genius who also had the misfortune of owning one. They come from the states direct from RSW solutions, anywhere else is a fake unless it's being sold second hand potentially.
If you are planning on keeping the vehicle for a while and you can spare the cash you will save yourself days of heartache and lots of cash by purchasing one.
if you are lucky there maybe somebody nearby that may help you out who already has one
Anything else in my opinion you are weeing in and mainly towards the wind with the L322.:)
 
holidaychicken said:
The Allcomms works on the 04 plate which is what i have also, by textbook i guess you mean the landrover T4 testbook which is fine if you have £100 / hr to spare. The Allcomms has been designed specifically for your model by a computer genius who also had the misfortune of owning one. They come from the states direct from RSW solutions, anywhere else is a fake unless it's being sold second hand potentially.
If you are planning on keeping the vehicle for a while and you can spare the cash you will save yourself days of heartache and lots of cash by purchasing one.
if you are lucky there maybe somebody nearby that may help you out who already has one
Anything else in my opinion you are weeing in and mainly towards the wind with the L322.:)
Click to expand...
 
Thanks. It would probably be a good way to go but I am not sure at this point if I will keep it. You are right about the landrover rip off prices and so I do not want to go this way just out of principle. I am however running out of options as the only thing I can think to do now is check the voltage on the left sensor and if that is the same as the right then it must either be the ECU or the programming of it. Do you happen to know if the Allcomms has lots of extra diagnostics from the air suspension module? Cheers
 
Thanks. It would probably be a good way to go but I am not sure at this point if I will keep it. You are right about the landrover rip off prices and so I do not want to go this way just out of principle. I am however running out of options as the only thing I can think to do now is check the voltage on the left sensor and if that is the same as the right then it must either be the ECU or the programming of it. Do you happen to know if the Allcomms has lots of extra diagnostics from the air suspension module? Cheers
 
TheDoctor said:
Thanks. It would probably be a good way to go but I am not sure at this point if I will keep it. You are right about the landrover rip off prices and so I do not want to go this way just out of principle. I am however running out of options as the only thing I can think to do now is check the voltage on the left sensor and if that is the same as the right then it must either be the ECU or the programming of it. Do you happen to know if the Allcomms has lots of extra diagnostics from the air suspension module? Cheers
Click to expand...
We heard you first time, no need to repeat yourself.:D Surely there must be a R/R Indy garage close to you? Shop around before paying Main Stealer prices.;)
 
Just out of interest, the front height sensors aren't back to front as they fit in two positions and can give strange results if somebody has had them off before
 
Great thanks and good shout on the sensors but I have had the RR for a good number of years and the error has only occurred after I changed the struts and was fine before then. Unlike a lot of owners mine has been pretty good. I could hardly complain that the struts went when I had done138k miles. I'll see if I can find an independent with a different drag tool first and see if that clears it. It throws a massive wobbler when you put it in off road mode as three corners raise up by 30mm odd but the right front goes to max as it is reading no deviation so thinks it has not gone up. Then when you try to lower it the three corners come down the rf stays up because it already thinks it is at Thorpe right height. Cheers
 
i think if you have swapped the height sensors and get the same result then its worth checking the voltage but download rave manuals and have a read as there is a massive amount of information.
i think diagnostics are going to be the key to your success. i have attached a page from the rave manual and there is also the workshop manual that tells you how to fix it that comes with the download.

I have read a couple of other posts and similar issues have been resolved by calibrating the heights using allcomms and others have had problems after removing the height sensor and putting it back on the wrong way around as we said already.

Download rave from here - http://www.landroverresource.com/


suspension.jpg
 
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Brilliant. Thanks. I will download and read through. Looking at the Allcomms specs you sent me it would seem it does a lot more diagnostics than the unit I have. As you say I can probably only check the voltages on both side at the sensor and at the ECU output. Barring that it must be inside the ECU which is either a reset or another unit. Not heard of many failing and I can see no water or damage of any kind around mine.
 
i am certainly no expert, there are others on here with more knowledge than me by a mile but there is also a load of info on this site and the net in general as these little darlings do like to go wrong a lot.
i have said it many times, the pleasure from owning these is when you finally work out whats wrong with it and put it right, until the next fault comes along and you start all over again ....;)
 
Thanks for the advice and I am looking forward to the pleasure when I sort this one out. Have now checked the voltages and there is 5v on both sides at sensor and ECU so that is not it. Managed to find a friendly independent with a landrover diagnostic kit. He put it on and put it through a full reset, programme and test of all parts and it went up down etc and worked perfectly. Because it still threw the rf plausibility error again he suggested that the diag equipment was somehow overriding the sensor fault during the test. As soon as I drove it back half a mile it threw the code again. So it would seem it is not the Diag equipment. This leaves me a little confused. Still it can only be sensor, wiring or ECU or possibly the wiring plug where it meets the sensor as I have noticed they are selling repair kits on eBay which must mean these fail. I think I am going to bite the bullet and get a new sensor and see what happens.
 
i know sometimes you can have an error somewhere else that causing strange symptoms on other areas as a lot of the systems are linked by the same canbus, things like abs sensors etc.
you will get it sorted, i always run a complete fault check through all the systems using the allcomms as its odd how somethings can be related.
keep the faith :)
 
Thanks for both replies. I did clean the plug and spray it when I switched the sensors over. Also when I checked wiring continuity I was doing it through the plug so it seems unlikely that is the cause unless somehow the connection to the sensor pins is not as Google as my testing probe but that is possible. I will go back and give it another clean and inspection just in case. Well worth a check for other faults just in case. Thanks for the support and although my problem might be annoying at least it is drivable.
 
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