experimental MAF reset switch: which circuit to interrupt? more complications

[BimmerBreaker]

Originally Posted by workingonit

I read about problems with the barometric sensor in the DME causing problems (on E46, E90, E92s), but no solutions or fixes other than a repaired DME.

And Happy, I've looked carefully at the wiring all the way back to the DME, and nothing looks worn or torn. The DME still looks untouched.

So, I don't want to be the guy who opens up a perfectly sealed and working DME, if nothing is amiss inside, so I'll try my Android app "BimmerTool" to see if it will give me data on the baro pressure ( it has a PID on the live data list for it). My other Android apps, Torque Pro and OBDLink, have a similar PID, but don't show data.

I haven't seen anything on my Foxwell about baro pressure, and I'm so far out of practice using Inpa, that I will have to learn all over how to use it, that I might not be able to verify if there's a baro pressure problem causing the MAF to read incorrectly. Also, the O2 readings look good, no matter what MAF sensor I'm using (wouldn't they show a baro problem as well?).



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It will only throw barometric sensor codes if the sensor fails. Often times they don't fail, they just report the wrong data.


I really think this whole thing is pretty crazy. The system is designed to report a problem when something is out of tolerance. Fooling the sensor into thinking it is within tolerance is completely missing the point of why these sensors exist in the first place. It's not hard to imagine causing other problems as a result of this tinkering - the least of which may be other engine codes; and could quite easily also cause engine damage.