Thread: Air suspension fault with disco 3

Gday Noel and welcome to the forum

Many things can cause the suspension to fault , it would be handy if you had access to a code reader so we could get an idea of the fault codes.

I assume you are saying that it can run fine for days then all of a sudden it faults and you are on the bump stops . Any message's come up on the message centre like compressor running to long or anything like that ?
For the car to drop to the bump stops all of a sudden it would have to be a major leak , but then you state it stays up for a period of time so that hints that its not a major leak.

I had issue's with my car dropping at random times whilst driving and after much searching it was a faulty battery. I also had similar issue's with a bad earth connection on the 2 small studs on the passenger side in front of the starter battery. Have you fitted a dual battery or anything like that recently ?

There are a couple of far more experienced people than me when it comes to the suspension but I wouldn't have thought the ride height sensors would have caused the issue's you speak of.

I assume you get the "bong" and the dash lights up when this happens.

Cheers Ean

Dropping to the bump-stops will occur for various reasons such as not being able to change heights within the allowed time or if more than 1 height sensor is misbehaving.

If you have owned the vehicle for only a short time then do you know if it has a Llams kit fitted?

Originally Posted by Graeme

Dropping to the bump-stops will occur for various reasons such as not being able to change heights within the allowed time or if more than 1 height sensor is misbehaving.

If you have owned the vehicle for only a short time then do you know if it has a Llams kit fitted?

Gday Graeme,

So does that have to be 2 ride height sensors at the same end, or same side , or just any 2 of the 4 sensors ?

Noel posted me a reply but as a PM , but it seems that turning the car off then restarting sometimes fixes it , but its possible the compressor may be hot and doesn't re-start, he is unsure. It seems if he does the restart procedure and the car goes to the bump stops , the car doesn't always Bong and throw up fault lights afterwards. He needs to do it about every km or so when its happening.


Cheers Ean

Thanks Graeme I don`t have llams 3 height sensors have been replaced so far and the mechanics analyser says cross articulation fault thanks for your interest regards Noel

Originally Posted by Ean Austral

So does that have to be 2 ride height sensors at the same end, or same side , or just any 2 of the 4 sensors ?

The system can reasonably well establish and maintain desired heights with only 3 sensors (presumably because the chassis can't significantly bend) but can't with any less.

Cross-articulation faults suggests signals from all sensors are within range and therefore valid but in combination they indicate an impossible situation (eg the body is twisting) so perhaps the 4th sensor is a dud or is simply loose on its mount. Some diagnostic tools, eg the IIDtool, can monitor and graph sensors values which could be very useful in finding the culprit.

You could try unplugging 1 sensor at a time to see if the problem doesn't occur when a particular sensor is unplugged.