He stated in two separate posts that the fault sets immediately, even before the engine has a chance to start. Even if the fault didn't set immediately, running the compressor when the compressor isn't commanded on, will likely set a fault anyway.

 

Thanks for this. I noticed when I got the compressor running that no air was going into the bags, so figured the valves were somehow closed.

Early on, I did try a hard reset to clear faults hoping I could get the suspension aired up, but the fault kept reoccurring immediately, so no luck there. I've got it scheduled to get into the stealership next week so hopefully get a handle on what's happening shortly. I'll update the post when I get some new info.

Thanks again for the insight.

 

So quick update. I ordered the 4DCan Diag tool from RSW Solutions to see if I could read/clear the faults and get the system working again. The first read reported "Compressor circuit" and then "rear height sensor mechanism" for both left and right. I went ahead and cleared the faults, only to see the red EAS fault trip almost immediately again. When I re-red the codes, the "compressor circuit" fault did not reappear, but the "height sensor mechanism" faults did. So, apparently as I let my ride sit for about 3 weeks, the rear height sensors failed? I have a hard time believing this and curious if anyone else has any ideas on testing the height sensors?

Thanks for all the input so far.

 

One final update that has the solution.

Was reviewing other threads discussing failure of two or more height sensors and came across the answer on a Defender forum somewhere. I run Johnson Rods which are shorter than the stock rods and trick the LR into raising an additional 2". Apparently, if you run the J rods and the LR goes down all the way to the stops, then the height sensors are out of range, throws the red EAS fault and disables the EAS. The trick was to simply jack the rear of the LR up a few inches to get the height sensors back in range, and voila, no more faults and the EAS aired up as supposed to (well I had to cycle the engine a few times as it thought it was in extended mode, then access, and then back to normal). AT any rate, problem solved and hope this helps anyone with similar issues in the future. Also, thanks to all who weighed in on the thread; the contribution by members here is invaluable.

 

If that diag tool also lets you calibrate the EAS and save settings, you might consider creating a modified height setting and using it in lieu of the shortened rods, unless you really want to run the rods full time.

Also, your description of the solution doesn't account for how your LR3 got down to the bumpstops in the first place. The rest makes sense and I've seen that once before.

 

I think it was a wise choice to purchase the diagnostic tool, because I'd be willing to bet a dealer would have sold you two rear sensors and likely discarded your J-rods.

I also agree with houm_wa. Check with the tool and see if it will let you modify suspension settings. J-rods are OK, but I'd rather just let the car do the work, if available.

 

Thank you for coming back and telling us the solution, needed it today.

 

Had the same issue today - left the LR4 for several weeks and it settled on the stops. Went to start it - got the suspension fault with no compressor action at all. Jacked up the rear and tried it - the compressor started, but only raised the rear axle. Jacked up the front of the truck and everything leveled out normally. I also run Johnson lift rods, so this is exactly what is going on. Thanks to wayoutwest for the tip.

 

It's worth trying even if you don't have Johnson rods-seems that if the sensors get too far out of range the EAS gives up. EAS is a great servant but a horrible master.