D4: Suspension will raise once system cooled message

[Tikka7mm08]

A friend's 2011 Disco 4 is locked in access mode (might even be on the bump stops) with this message coming on. Checked the fuses and AOK, relay looks ok (but can't tell for sure).

Put the OBD dongle on and the ECU shows no faults.

Searched few some threads here and elsewhere but no real success. Compressor was replaced in October so is new, and fault happened over night.

Any thoughts on what to look out?

Cheers
Bob

[Bytemrk]

Has he left it to cool?

Only times I have seen this on mine was immediately after lots of height changes ( showing someone what it could do :angel: )

Seems too much change in a short period can bring it on... otherwise mines been fine.

[LRD414]

When you say "happened over night", do you mean it occurred at night without multiple uses of the system to do height changes frequently (which normally triggers that message)?

If so then something is not right. Not sure how temp is detected but that would be a potential fault point.

Not sure if the OBD dongle mentioned is a LR specific product. A generic tool will not read much and almost certainly won't read the suspension ECU.

Scott

[BMKal]

Only time I've got that message was when driving up the highway with a flat tyre. Suspension was attempting to compensate for difference in vehicle ride height.

Stopped and pumped up tyre and everything returned to normal (had to replace tyre next day though). The suspension fault message was the only way that I knew there was something wrong. The D4 continued to drive on a flat tyre with no unusual "feeling" in the vehicle at all.

I have since installed a decent TPMS ...................... ;)

[LRD414]

Actually it could also be a leak that is causing the compressor to run for too long.

[Tikka7mm08]

Actually it could also be a leak that is causing the compressor to run for too long.

"Overnight" was a figure of speech, although it literally was fine when parked up that night and then "out of the blue" (another figure of speech) the next morning it would not adjust the suspension. So the compressor couldn't be hot (120DegC) to hit the too hot cut-off point.

[DazzaTD5]

The system is designed to prevent excessive running of the compressor, while I've not seen that message on a customers vehicle, I assume thats what it is.

Remove the plastic cover (or bash plate if it has one fitted) on the compressor and see if its full of mud, clean it all out if it is.

Regards
Daz

[Tikka7mm08]

Well in true Landy fashion it self-corrected! Friend shifted it a few meters in the driveway and the suspension popped up to normal height. He the cycled it through the settings no problem. Go figure.

[LRD414]

Well in true Landy fashion it self-corrected! Friend shifted it a few meters in the driveway and the suspension popped up to normal height. He the cycled it through the settings no problem. Go figure.
Worth removing the plastic cover as suggested and have a look.
Mud/sand builds up under there and may be impinging on the compressor temp sensor.

Scott

[LandyAndy]

I suspect you have a puncture in one of the air bags.
When the vehicle was shifted it has moved the fold in the bag sealing the leak.I suggest he gets soapy water and tests for leaks.Raise it to off-road height.
Andrew

[Tikka7mm08]

Yes good advice. Thank you. My D90 on NYE would not work the full beam in the always on position only manual. Next night worked perfectly. Landys keep you guessing sometimes.

[Grentarc]

I suspect you have a puncture in one of the air bags.
When the vehicle was shifted it has moved the fold in the bag sealing the leak.I suggest he gets soapy water and tests for leaks.Raise it to off-road height.
Andrew
It should detect a leak as it will realise it is not building pressure in the line and throw a suspension component failure fault and drop to bump stops before the compressor overheats.


For future reference though, the temp probe is bolted to the compressor head with a M6 torx screw.

A lot of people see this fault just after they install Llams, as they play with it for the next half hour.

[DiscoJeffster]

I saw this fault whilst trying to inbox myself on the beach in Esperance. Lowered to normal to get it to bottom and trigger extended but it came up with that. I'd only just raised to to off-road height a bit beforehand mind, but it does seem to not take much to overheat.

[Grentarc]

I saw this fault whilst trying to inbox myself on the beach in Esperance. Lowered to normal to get it to bottom and trigger extended but it came up with that. I'd only just raised to to off-road height a bit beforehand mind, but it does seem to not take much to overheat.
When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.

[DiscoJeffster]

When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.



Oh cool, didn't even think to monitor its temp with my iidtool. Mines a 2009 with 228k on it, second owner. It's never been touched so I might get in there and give it a good clean. Cheers for the tip.

[Oztourer]

I suspect you have a puncture in one of the air bags.
When the vehicle was shifted it has moved the fold in the bag sealing the leak.I suggest he gets soapy water and tests for leaks.Raise it to off-road height.
Andrew

Safety First - always, always, always take precautions when working under a vehicle. Especially one with variable height air suspension if you suspect a leak! There is no clearance under a disco when it's sitting on its bump stops and if it decides to let go on you when you're under there it won't be a nice outcome!! My neighbour has a friend that was crushed under a car whilst working on it. They survived but received substantial injuries and took many months to recover.

Enough of the morbid stuff and back on topic, when I first took ownership of my D3, my compressor overheat on a trip back from SA to Sydney due to a faulty ride height sensor. Needed to get towed from Gundagai - NRMA platinum saved me $2100!! The good new was that it cost me $150 for a new sensor to get fitted and LR also replaced my compressor for free under an outstanding voluntary recall campaign - the car was 10 years old!!

[DazzaTD5]

Oztourer brings up a excellent note, always and I mean always use an axle stand on any air suspension vehicle while under it, regardless if its all working correctly or not, while I do it second nature, others might not....

This happened to my bro inlaw a while back, his mates Discovery 4 had an issue and on the side of the road they were under the vehicle, I pointed out the potential for disaster and he admitted it didnt even cross their minds.

Regards
Daz

[PTCAAR]

When I installed my new compressor, I watched the temperature through my IID Tool of its first run - my reservoir and springs were all empty at this time - it got to 117?C by the time it got the D4 up to normal height and the reservoir up to pressure. This took about 5 minutes in total.
If a compressor is older, the plastic cover is filled with mud/dirt/sand and the inlet filter hasn't ever been cleaned (or replaced with a better, serviceable filter like I have) then it is going to take longer to build up pressure, have less cooling capacity and therefore more likely to hit thermal cut out.Sorry to resurrect this old post, but I've just had my compressor fail in my disco 3. I'm in the process of getting a replacement sent over from the UK. In your post you said you have replaced the inlet filter with a serviceable one. I was wondering what you have used? As I searched and can't find anything about servicing the factory inlet filter. Any help would be much appreciated. Thank Peter

[Grentarc]

Hi Peter,
I fitted this air compressor filter which has a 3/8 male BSP thread, and attached is an 8mm push fit to 3/8 female adapter. The air filter elements are replaceable paper ones used on a lot of small workshop compressors, and cost about $1 each online. The whole cost I think was under $15 and as you can see on one of the photos, not a speck of dust on the clean side of the filter, unlike on my OE one.https://uploads.tapatalk-cdn.com/20190501/aa2d4e90ff927afebb472d71b5951dd9.jpghttps://uploads.tapatalk-cdn.com/20190501/7bd3cf83d06738a11cea528f0dc4f571.jpghttps://uploads.tapatalk-cdn.com/20190501/3b68642bf91198e54d73a61e4c52cfa9.jpghttps://uploads.tapatalk-cdn.com/20190501/1008a2dd6add28a864b8c16ff0eb49ba.jpghttps://uploads.tapatalk-cdn.com/20190501/ff18f52cd8c3eee0181780b2c143f005.jpghttps://uploads.tapatalk-cdn.com/20190501/8e425a03ca47723298936e67c7f49380.jpg

[PTCAAR]

Hi Peter,
I fitted this air compressor filter which has a 3/8 male BSP thread, and attached is an 8mm push fit to 3/8 female adapter. The air filter elements are replaceable paper ones used on a lot of small workshop compressors, and cost about $1 each online. The whole cost I think was under $15 and as you can see on one of the photos, not a speck of dust on the clean side of the filter, unlike on my OE one.https://uploads.tapatalk-cdn.com/20190501/aa2d4e90ff927afebb472d71b5951dd9.jpghttps://uploads.tapatalk-cdn.com/20190501/7bd3cf83d06738a11cea528f0dc4f571.jpghttps://uploads.tapatalk-cdn.com/20190501/3b68642bf91198e54d73a61e4c52cfa9.jpghttps://uploads.tapatalk-cdn.com/20190501/1008a2dd6add28a864b8c16ff0eb49ba.jpghttps://uploads.tapatalk-cdn.com/20190501/ff18f52cd8c3eee0181780b2c143f005.jpghttps://uploads.tapatalk-cdn.com/20190501/8e425a03ca47723298936e67c7f49380.jpg

Thanks Justin, for the very quick response and photo's. That looks like a great replacement and easy to service, unlike the factory filter. I'll track down the required parts and install ready for the new compressor. Thanks again. Peter[smilebigeye]

[Eric SDV6SE]

That's cool, so my plan is to service existing compressor with the std X8R or 4x4Airseals kit, then retrofit one of these extended breathers, should see me through the next 100 000km