2006 E53 4.8is Self Leveling Suspension issues and codes
I know this is an extremely common topic but I can't seem to find enough info in other threads to know what to do next. Please let me know if you need additional information.
Self Leveling Suspension issues in past (2016) resolved by installing piston rebuild kit by bagpipingandy. Came back recently so I figured installing a new kit would resolve but no luck. Every time I take X to tech he clears code and compressor comes back on. A day or two later fault reappears. After 6 trips to reset I bought PA Soft to be able to reset myself until I figured it out. The good news is that the airbags must be in good shape as the vehicle doesn't sag even after 2 weeks in cold weather so the problem must be elsewhere. I checked the connections in the rear and no obvious leaks/hissing. Ran PA Soft again today to reset and came up with following codes/error messages: 1) Under Light Check Module, I get a shadow code of 57[087] Level control system (not sure if this means anything but included anyway) 2) EHC -> 74/68 - Reservoir pressure remains constant, when filling of reservoir is requested 09/24 - Reservoir-valve 3) ABS* -> 60AF/A0 - RPA-Error: detection deflation system: RPA inactive, difference of the level of the front axle_air suspension is to big 60B0/A0 - RPA-Error: detection deflation system: RPA inactive, difference of the level of the rear axle_air suspension is to big Other pertinent info: - Vehicle sits at correct height - at least visually - the system does not appear to be leaking. Doesn't sag with pump fault for weeks at a time - When I clear fault and the compressor runs I can't change the ride height in either direction (can't raise or lower vehicle) yet green indicator lights are on and will flash. It seems that when the compressor kicks on the pressure tank is either not getting fed or is not recognizing the increased pressure. Not sure how to interpret the errors listed above. What is the "reservoir valve?" Any ideas on what I should be looking for? Bad sensor? Clogged line? Thanks in advance. |
I'd check heck to make sure your ride height sensors haven't been flipped from an over extension.
Now if you're unlucky like me it could be your controller dying which for me led to the replacement of the air bags with coils because the 6 controllers I tried showed as junk. (Possibly something on the White Witch was killing them and they were good when I started) Sent from my SM-A730F using Tapatalk |
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That happens regularly on xo. At least quarterly somebody has this problem. |
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Hopefully he won't Zamboni his ride with a pregnant wife in the car like that one poor bastard.. [emoji28][emoji28] Sent from my SM-A730F using Tapatalk |
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Ride height sensors are basically a rheostat and at a deep flex of the suspension can move into a negative position making the controller think you're driving with a major difference between front/rear. Happens a lot after deep potholes, etc. Sent from my SM-A730F using Tapatalk https://uploads.tapatalk-cdn.com/202...849e709bfc.jpghttps://uploads.tapatalk-cdn.com/202...eec1b5a4a2.jpg |
Thanks again. I’ll have to take a look. Not sure if PA Soft gives the height measurements for reading/resetting them. I guess I’ll have to upgrade. Any record? INPA? Fox well? Autel?
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I use a Foxwell NT-510 and it'll show heights and everything else.
Just don't mess around too deep changing settings or you could end up locked into transport mode. Sent from my SM-A730F using Tapatalk |
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At least 3x a year there is a thread on xoutpost from it happening. Often after a service that there front of the car is lifted. Apparently just with wheels dangling it's possible to bump the arm and flip it |
UPDATE
OK I got the Foxwell NT-510 finally and pulled some info. I was able to raise and lower the vehicle with no issue. Here's what I got.
These were figures before I tested compressor and air bags a few times - car off. Deviation, ride level, from specified value Ride level, front left: 3MM Ride level, front right: -10mm Ride level, rear left: 0mm Ride level, rear right: 6mm After lifting and lowering a couple times these were the numbers - car on: Ride level, front left: 0mm Ride level, front right: -1.4mm Ride level, rear left: -9mm Ride level, rear right: -5mm How do I interpret this? Also some voltages if they mean something. Before starting car: Voltage terminal 30: 11.50V Voltage, ride level sensor Front left: 3.30V Voltage, ride level sensor Front right: 2.11V Voltage, ride level sensor Rear left: 2.19V Voltage, ride level sensor Rear right: 2.70V Also some compressor and accumulator info. Before starting car or running compressor: Accumulator pressure: 13.10 bar, Compressor temp. 3C After raising and lowering car: Accumulator pressure: 1.30 bar, Compressor temp. 37C After starting car and lifting and lowering a few times: Accumulator pressure: 15.60 bar, Compressor temp. 98C (that's 208.4F to me. Seems pretty hot) OK does any of this make any sense? Thanks in advance. |
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