N63 Stock Data Log - Troubleshooting 0x310B

[borderm3]

E R R O R M E M O R Y
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Date: 10.12.2016 17:00:58
ECU: MSD85
JobStatus: OKAY
Variant: MSD85
-------------------------------------------------------------

RESULT: 1 error in error memory !
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310B 0x310B Ladedruckregelung 2, Plausibilit‰t

Druck zu niedrig
Testbedingungen erf¸llt
Fehler momentan nicht vorhanden, OBD-entprellt
Fehler verursacht kein Aufleuchten der Warnlampe (MIL)

Error code: 31 0B 28
================================================== ===========

Translated to English via google

E R R O R M E M O R Y
---------------------------------------

Date: 10.12.2016 17:00:58
ECU: MSD85
JobStatus: OK
Variant: MSD85
-------------------------------------------------- -----------

RESULT: 1 error in error memory!
-------------------------------------------------- -----------

310B 0x310B Load pressure control 2, plausibility

Pressure too low
Test conditions
Error currently not available, OBD debounted
Fault does not cause the warning light (MIL)

Error code: 31 0B 28
================================================== ================================================== ===========


I get the above code. Here is the thing, it happened when I towed for the first time. I got a notice on the dash regarding an engine malfunction and potential power decrease. Seemingly, there was no change in power. After I unhooked, I romped on it and no problems, no notifications. I hooked back up, pulled it, got the same code.

I speculate that there is a target boost pressure bmw expects and if you do not reach that within some threshold in time and amplitude, this code is thrown?

I ordered 2 new boost control solenoids. I am hoping this fixes it, if not perhaps a diverter valve is leaking? I don't suspect it to be a steady state vacuum leak since it never happens unless it is under the load of towing.

Can anyone think of anything else that could cause this under extreme load only?

I was hoping someone might have a 'stock' n63 datalog that I could use as a control and compare it to my car. I am using the bmw logger.

Thanks
Chris

[borderm3]

I replaced both of the pneumatic solenoids for boost control, they did not fix the issue.

I am going to try to smoke test it to see if there is a boost leak.

[borderm3]

As far as I can tell it looks like BMW's wastegates operate the opposite of a traditional wastegate, vacuum pulls the flap shut.

I am starting to think my problem is with the waste gate actuator not shutting under proper vacuum.

[525DA_touring]

And now ?

[Sophisticated Redneck]

Originally Posted by 525DA_touring

And now ?

Looks like this thread is super old but I will add some notes here in case anyone else gets this code:

On the N63, you can adjust the wastegates actuator arm fairly easy as they become worn with time. From the factory the wastegates are set to be firmly closed at -10psi. You can set this with a simple hand held vacuum pump like they use for brake changes.

Also check your Crank Case Ventilation lines. They will crack right around 70-90k. They also have a special check valve in them that is known to go bad too, if this happens boost pressure will leak into the crankcase.

This alone will solve most under-boost codes. Then go on to the pressure converters, diverter valves, etc. if the codes still occur.