Suspension Fault Question Again!!!!

[theh33d]

Sorry in advance

I'm sure this has been asked a thousand times already.

Ok my D3 has in the past thrown up the suspension fault warning once in a while (once every six months or so) but recently the old girl is having a bit of go of it right now where I have seen the fault warning thrown up 3 times over the last week.
Now I don't have suspension sag, well at least not noticeable but sometimes if I've been away to work for a few weeks she sometimes will take a little drop.
The warning will clear itself after turning the car off and restarting it.

Any ideas as to what is throwing the warning up?

Also can someone advise on how long their compressor runs for during car start up, just want to see if my car has an air leak as this maybe what is throwing up the warning.

Last question, does anyone have a PDF of the air lines routing to allow me to check the whole system for any potential leaks.

As always thanks in advance.

[Graeme]

I suspect that the compressor isn't working well, possibly due to a blocked dryer or a failing compressor. Reading the stored fault codes is a good starting point, which can be done by any IIDtool setup for a D3 or later Disco and other later LRs.

[SeanC]

My D3 will settle evenly if left for a while and I don’t have any leaks. Put the car into off-road height pull the 5 amp eas fuse leave it for a few days to see if there is any height drop. If so then you have a leak.

I found this quite useful.

https://www.disco3.co.uk/gallery/albums/userpics/15405/Land%20Rover%20factory%20D3%20air%20suspension%20d escription.pdf (https://www.disco3.co.uk/gallery/albums/userpics/15405/Land%20Rover%20factory%20D3%20air%20suspension%20d escription.pdf)

[SeanC]

Just a note. The reservior valve block diagram has the rear valve block and front valve block connection pipes mixed up. 7 should be the front valve block connection and 8 should be the rear valve block connection. The front of the vehicle is to the right the rear to the left.

[Graeme]

Put the car into off-road height pull the 5 amp eas fuseThe 5A EAS fuse in the engine bay fuse box is in the feed-back circuit from the compressor relay to the suspension ecu so that the suspension ecu knows when the relay contacts are closed in order to monitor for a stuck relay. The correct fuse is the 20A engine bay EAS fuse as that supplies power to the suspension ecu's electronic switches (FETs) that operate the various valves.

[loanrangie]

The 5A EAS fuse in the engine bay fuse box is in the feed-back circuit from the compressor relay to the suspension ecu so that the suspension ecu knows when the relay contacts are closed in order to monitor for a stuck relay. The correct fuse is the 20A engine bay EAS fuse as that supplies power to the suspension ecu's electronic switches (FETs) that operate the various valves.


Number 26 i believe.

[CanadianRyan]

Mine did exactly the same. Started off with a light every few months, but became more frequent. It's likely a sign of a dying compressor and the fault is filling the reservoir too slowly. I rebuilt mine with new piston ring, dryer beads etc which gave me a few extra months i reckon, but in the end it had to be replaced. If you don't have any sag after a day or two of sitting you probably don't have a leak bad enough to cause a fault.

[theh33d]

The D3 is currently on it's second air compressor with 124,000km and a full log book history.
Not sure what compressor the D3 has right now but I'll check.
So I thought that surely the second compressor cant be o n it's way out and this is why I was looking at other options for my faults.

Ok how long should your compressor run for on start of the car in the morning?

[Graeme]

As an indication, the fault that is posted when the reservoir pressure is rising too slowly usually occurs about 5 minutes after starting. A good compressor will raise a vehicle from access height to normal height then refill the reservoir in 1-2 minutes, assuming that the reservoir was full when the engine was last run. The reservoir will hold enough air to raise the rear and partially raise the front of an unloaded vehicle, only requiring the compressor to finish the task, after which the compressor refills the reservoir.