Self leveling suspension question
 

Hey guys, first off thanks for all your help on other issues. As you know I picked up a 4.8is and have a few bugs to work out..

Bluetooth..another thread

Now the self leveling inactive message....

So last night I work with my friend who is a BMW tech...my car is not losing air, the car stays at the same position overnight..we tested the values on the sensors all looked good, 3-4volts, Except for the right front which was at 1:09.. I thought that was odd, also with the car up in the air we noticed that same arm was basically flipped backwards..we thought that was the issue. We reset every thing, we manually filled each corner, with success, and calibrated the suspension. All was great, I drove about 39 miles, and boom it popped back on..called my tech back he is stumped ( we are going to keep at it) but wanted to see what was going on. I hooked up my BMW 1.4 scanner and I did read a fault, we didn't see last night.--- "RESERVOIR PRESSURE REMAINS CONSTANT WHEN FILLING OF RESERVIOR IS REQUESTED"

So my question to the experts here...what does that mean? The accumulator had 14 bar of pressure,again everything seemed to operate correctly?

And yes I have searched, and I have done all my du dillegence, we are just stuck..car rides good, doesn't loose air, the ride height button blinks when I tried to raise or lower the car....:dunno::dunno::dunno::dunno:

Please help if you can...thanks

Seems like your pump is weak. Does it seem to run a lot? It should not run normally.

Also, this and your ULF module causing issues, have you really checked your battery and alternate. Strange shit happens to our cars with bad alt and or battery. Read my sic to unlock your obc and monito voltage.

Ok I will check...I just went out again..cleared the codes took the pump out of dome. It is coming on. But when I press the lift button or the lower button, the pump runs. But the car doesn't do anything???:dunno:

Last night we were able to lift each corner manually...wtf? This SLS sh*t is for the birds..if I had leaks wouldn't my car sag, some where? I took measurements and will measure again in the morning to see...

27.5 inches rear

27.25 inches front. Measuring from bottom of rim...

I am stumped..

Yea pump seals might be shot. There is a rebuild kit on eBay. Search here for air pump rebuild links.

But why could we lift the car manually last night? If the lump was shot...it was slow...

Ive programmed a bunch of different E53s with 4 corner leveling, if everything isnt working right you can get finicky issues as the one your having.

Ive delt with 2 having the same issue as yours. It most likely is a weak pump and on one of them this "workaround" worked, on the other it threw error 2 days later and was out of spec again.

Program the ride height to where you want it and dont mess with the offroad mode and access mode on the button by leaving it be. As long as your bags arent leaking a bunch if you program it and the system maintains the correct level then your good for a while or until you get a chance to rebuild the compressor. From the one it did work on its been maintaining the height fine (been a few months now) since i calibrated it cause it was all off after a shop had it and couldnt get it level all around.

Because lifting one is not like lifting all 4. Temperature swings can close up leaky seals too. Who knows why. But seems your pump is limp.

That exact code is the pump seals being shot - you need a rebuild kit for the compressor or a new compressor - was my same issue I chased for 6 months about 4 years ago - EHC 74 right?
It will pump up manually but be slow - the module needs to see it working within a specific time frame/pressure, if its too low it will throw that code and deactivate.

Rebuild or replace the compressor, clear the codes, and have working air suspension. Period.

:iagree:

What everyone's says.....and everyone of us had that "SLS" issue.

You're compressor needs attention.

Simple and easy fix.

Sweet! And yes correct code. Anyone in Atlanta have a working pump they want to part with? I would love to fix today!!
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