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#1
12-10-2011, 12:37 PM
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New owner here, need help with 4-corner air suspension!
The car rode fine for a few days, normal ride height and all, until this morning. It was parked at my girlfriends overnight and this morning my front end is slammed, basically a one finger gap to the fender. The rocker switch just blinks 3 times, I have checked the 2 fuses in the cargo area and the one in the glove box, as well as gone under the cargo area to inspect the pump, which visually looks fine. However, I don't hear it switching on or operating. Can someone help me do a bit of self diagnosis, I know there is a fuse to check in the spare tire well "high amp fuse" area, I think it is #7 and it's a 50 amp, and also I would like to check the relay for the compressor itself before I start going to the dealer. I have read almost all the threads on this site about it and although they are great and all I need some pictures or other help to try and get this car back to normal height, thanks! UPDATE 8/28/12: I just want to update that the compressor replacement and clearing of the fault EHC 74 - Accumulator Filling Requested Pressure Remains Constant (which was my only error) with no other programming or testing has fixed my air suspension and now I am proud to say that my air ride and ride height control works, for the first time since I bought the car in December. I did not need to program my control module since it was done by the previous owner before I bought the car. I can't thank Neil and his GT1 (neilrmp), Papa13 and his used but perfectly working compressor I bought for half the price of a new Arnott unit, and the forums for their direction to use Arnott to replace my front air struts back in december when I found they were leaking. Xoutpost is a wonderful place and I look forward to it for the years to come as I own this car. Last edited by Ricky Bobby; 08-28-2012 at 11:34 AM. 
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#2
12-10-2011, 02:20 PM
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Also just to add, under the dome where my air compressor is there is NO relay there, I guess because I have a different compressor compared to guys with only rear air susp.
In my relay panel in the trunk there are only 5 slots, 1st is left blank, 2 green relays, then 2 blue relays.
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#3
12-10-2011, 02:21 PM
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Pretty good chance you shocks are shot. Just did mine. If the from end will rise do the test of the bags to see if they are leaking. I could not see mine leaking but the pass front would drop 2.5 inches overnight and the drivers would drop 1 inch overnight new bags hold it perfectly overnight.
__________________
2003 540i Mtech 6 speed 1989 335is 20 psi.
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#4
12-10-2011, 04:36 PM
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How can I get my compressor to run?
I had everything open before and couldnt hear the compressor running, even when i started the car up, no rising at all from the front. The rear suspension height is just fine, but both fronts are slammed (one is slightly lower), and I turned the car off and although I couldnt see the front end rise up at all I heard a quick "hiss" from the front end somewhere. Also, the EHC2 module has been replaced already, don't know if I mentioned that so I am hoping that I won't have to do that again!
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#5
12-11-2011, 01:11 PM
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OK Update from yesterday:
I went for a drive and voila, the front raised up to it's normal operating height, but I went out this morning and the front seems a bit lower again, not completely slammed like yesterday morning, so I'm assuming since it pumped up last night that the compressor works! which is good..... question is why overnight is my front suspension sagging, is it leaky struts (both), or one of the sensors on the suspension sending the wrong signal to the EHC module?
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#7
12-12-2011, 07:08 AM
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It sounds like you have a leak from that front airbag. If the system pumps-up to the correct height then it would seem that the pump and related electronics are functioning, as are the level sensors otherwise it would not self level.
Looks like you will be buying a new air spring soon! Gerry.
__________________
Black E53 V8 on 20's, lowered, drilled discs and poly bushes, strut brace and adjustable sway bars.
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#8
12-12-2011, 11:35 AM
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Quote:
http://www.xoutpost.com/articles/x5/...e53-years.html Ricky Bobby, The problem could be another component of the EHC2, like the pressure acummulator/valve, but its a high probabilty its one or both of your front air struts. I'm sorry but currently I can't tell you how to distinguish if its one, the other or another thing altogether. You can replace one or both air struts as you like. When I had this problem, I had a shop check for leaks and found one leaked but not the other. At first, I was going to replace only one but in the end decided to replace both. You can get replacements from Arnott Industries. My main point is that I would just double-check and make sure you in fact have a leak.
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#9
12-12-2011, 11:59 AM
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Quote:
Thanks X5girl and twins, i did read about the replacements from Arnott, thankfully they are there for us owners, and was one of the reasons I would like to have an idea before I bring to a trusted shop instead of just going to the dealer! I will hopefully have time to get to a shop sometime this week, and have them do a leak test on my air struts, thank you for also mentioning the accumulator/valve, is there a separate one for front and rear? if there is one for the front and one for the rear I will have that checked as well, especially if they find no leaks on the front. So, just to understand the system better, if I did have leaks at my air struts, the system would register a leak and that is where my "selflevel susp inact" message comes from, and would also be why the ride height control on my dash does not work? I just want to be sure I understand the system, if one component is off the whole system is off?
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#10
12-12-2011, 12:22 PM
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Quote:
RealOEM.com * BMW E53 X5 4.8is LEVELLING DEVICE/PRESSURE ACCUMULATOR See attached for more information about the EHC2 (two axle air suspension). There are sensors that "know" you are out of range on the leveling. It doesnt' really know you have a leak in your air struts per se.
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