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Old 03-01-2021, 08:38 PM
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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.
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Old 03-01-2021, 10:49 PM
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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)


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Old 03-02-2021, 01:54 AM
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Quote:
Originally Posted by EODguy View Post
I'd check heck to make sure your ride height sensors haven't been flipped from an over extension.

That happens regularly on xo. At least quarterly somebody has this problem.
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Old 03-02-2021, 02:08 AM
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Quote:
Originally Posted by andrewwynn View Post
That happens regularly on xo. At least quarterly somebody has this problem.
+1
Hopefully he won't Zamboni his ride with a pregnant wife in the car like that one poor bastard..

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Old 03-02-2021, 08:59 AM
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Quote:
Originally Posted by EODguy View Post
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)


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Is that really a thing? Ride height sensors flipping?
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Old 03-02-2021, 09:13 AM
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Quote:
Originally Posted by cmbenedict View Post
Is that really a thing? Ride height sensors flipping?
Yes it's really a thing.

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.

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Old 03-02-2021, 09:27 AM
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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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Old 03-02-2021, 09:50 AM
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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.

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Old 03-02-2021, 12:40 PM
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Quote:
Originally Posted by cmbenedict View Post
Is that really a thing? Ride height sensors flipping?


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
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Old 03-07-2021, 07:58 PM
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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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