Air suspension and/or Fuses 101?

[Clutch]

More thanks again Ricky Bobby; I appreciate the advice and encouragement. Yep, I’ll keep going a little further. I had eyed those rebuild kits before and I bookmarked “bagpipingandy”’s website. I read some success stories here in the forums with these rebuilds. It will take me several weekends to get the free time, but I will report back on the progress.

Question though – you mentioned that even with a newly-healthy compressor, “that you 100% need dealer software to reset the module, or equivalent. Unplugging the battery will not reset the faults in the SLS module”. Being frugal, I hate to spend a huge some to simply flip a flag. (or is it more complicated than that?) Can you recommend the least expensive software tool that will get this job done? I have read many a posting on the general subject, and my cost-digging shows CDs ranging from $50 to full blown hardware computers rushing $800!! I realize I may be able to use the more complete software packages for a variety of things, but frankly I want to fix this problem and sit tight budget-wise for a while. Now is not the time I can shell out more big bucks on this. Any suggestions?

[TwinTurboGTR]

IMHO before you do anything, confirm the faults for yourself. The EHCII is a very complex system. While the dealer techs should be educated in this field, the education provided on the system from what I have heard was not very in depth.

With that said, it is worth your while to purchase the diagnostic software on your own to determine the failure point. Within the program, you are able to calibrate the system and run through certain test patterns to start checking items off of the list. Most people who have the software use a Virtual machine to run the dealer software. A popular one is from a Romanian Seller from fleabay. The software can be a challenge to install and get to work properly, but when it does, it can provide a lifeline to diagnosing a problem.

I would first reverse engineer the problem, beginning with getting the software to scan for the faults. From there it can help you decide what to do.

Although I agree with RB about the compressor, it doesn't hurt to find this info out for yourself.

[Ricky Bobby]

x2 to what TTGTR said, the Romanian suite for $50 will allow you to scan the faults in the module and reset them when necessary. I would confirm you are throwing the "EHC 74 accumulator filling requested pressure remains constant" code prior to buying the rebuild kit.

If that is the code and the only code you are throwing however, I can say with 100% certainty your compressor needs a rebuild, and then reset the faults and your air suspension should be working properly again.

[Clutch]

Interim update – well, after getting the software and cables from Romania, I spent several HOURS trying to configure my laptop to run this virtual machine software, reassign COM ports, update IP addresses, turn off firewalls, etc., etc., etc. My god, I didn’t realize this was going to take a degree in IT to run this package. What an unexpected unpleasantness. There are DAYS of reading one can do on the Internet forums on this software, so I guess I have that in front of me. Frustrations galore and most of the time the software would not see the car. The only piece of the software suite I could make work was the INPA (the simplest).

However, the good news is that with INPA alone I was able to pump up all 4 corners without the compressor overheating, and I was also able to level them out and put the reservoir at 50% capacity. So, if the bags continue to hold, I will be riding smooth and looking like I should, even if I have not yet cracked the other software to do a thorough troubleshoot/fix and reset the SLS Inactive message. I have not found the error codes yet but I expect as RB does that I will end up doing a compressor rebuild. I will report back as I find time to conquer the beast. I really would like to eradicate that message.

Thanks again for all the help and tips.

[HDUB]

Hello all, this is probably the most relevant thread I could find to ask this questions.
My 2001 4.4i is acting up and I can't figure it out to save my life. The Air suspension deactivates sometimes and the rear driver side drops. I know it's not a leak because the car doesn't deflate over night. even when the car is locked. I've checked all the fuses and non are blown. When i turn the car off and then on or take the fuses out and back in, the compressor kicks on and the inflates the bags. Any thoughts on where to look for problems? thanks,

[Ricky Bobby]

Scan the module with DIS to see if there are any soft faults in the module

[fourpoint8]

Hey bud, found your post whilst tearing my hair out over my air suspension on my 4.8is. I have the exact same issue as you reservoir filling remains constant, at the moment my car is sat on the floor and drives like sh*t. I have a friend with INPA and we want to try filling the bags as you did, do you have any guidelines on how to do this? Also did you get to the bottom.of the issue? Thanks for the help in advance this is driving me mad!!

Bryan (UK)

[EODguy]

Originally Posted by fourpoint8

Hey bud, found your post whilst tearing my hair out over my air suspension on my 4.8is. I have the exact same issue as you reservoir filling remains constant, at the moment my car is sat on the floor and drives like sh*t. I have a friend with INPA and we want to try filling the bags as you did, do you have any guidelines on how to do this? Also did you get to the bottom.of the issue? Thanks for the help in advance this is driving me mad!!

Bryan (UK)

Have you been messing around with an NT-510 or NT-520 or something similar? If so check to make sure you didn't start a ride height calibration or similar and ended up with it all the way down and in transport mode, and don't forget to check your level sensors and make sure the arms are positioned correctly.

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[fourpoint8]

Thanks mate, don't think it's in transport mode, only the front is down. Do you have any pics of what the ride height sensors should look like? Thanks

[EODguy]

Oh ok, when you posted that it was dropped I thought you meant all four corners.

These pics were posted on here before but I can't remember who it was or I'd give them credit.

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