me7.1 2.7t mafless error solution

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Snow Trooper

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	me7.1 2.7t mafless error solution « on: October 12, 2015, 12:18:43 AM »

For some reason this is treated as guarded info. Ironically I only sought out a solution because of this lack of info. I have run mafless on my shop car off and on for various reasons for years yet never done it without faults and losing cruise control/esp/etc as well as less than stellar fueling plus limp mode so you have to stay off an n75. The fueling thing is easy to sort with throttle mapping as documented on this site. Thanks to masterj (http://nefariousmotorsports.com/forum/index.php?topic=531.msg73910#msg73910), he got me thinking at looking at it again in an effort to solve just because it shouldnt been an unknown at this point 15 years into our platform.

Im not saying this is the only way to do this, the best way or without any possible fault. I have tested it in a limited capacity but it seems to work perfect to achieve my goal. If you have a better way, don't post and just say that (looking at you prj), tell us what you do and why.

mbox:
1b9e2 - KFMLDMN threshold for B_minflr diagnosis HFM/HLM change entire map to 0
10d69 - CWBGMSZS change from 2 to 0
1819c - CDEHFM maf code word change from 1 to 0
18802 - CWDHFM maf code word change from 0 to 1
and finally, the one map you can change alone to simply remove the illusive p0102 fault and sensor error limp but will not have cruise and esp without the other 4 changes...
10716 - CLALM maf voltage signal error class change from 3 to 1

With a 5120 setup and properly calibrated throttle maps, I really like how smooth the car is on this setup, for the first time ever with very simple changes.


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adam-

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	Re: me7.1 2.7t mafless error solution « Reply #1 on: October 12, 2015, 12:42:11 AM »

[applaud]


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Lost

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	Re: me7.1 2.7t mafless error solution « Reply #2 on: October 12, 2015, 12:44:54 AM »

Thanx for sharing.


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vwaudiguy

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	Re: me7.1 2.7t mafless error solution « Reply #3 on: October 12, 2015, 10:58:44 AM »

Very nice info. Thanks!


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fknbrkn

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	Re: me7.1 2.7t mafless error solution « Reply #4 on: October 12, 2015, 12:24:03 PM »

in me7.5 i change a few bytes to prevent sending this b_error to CAN and zeros CLALM
doesnt know if its right way but ASR/ESP working good, no issues at all.


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Snow Trooper

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	Re: me7.1 2.7t mafless error solution « Reply #5 on: October 12, 2015, 01:17:14 PM »

Masterj seems to have found the solution on 7.5 and it's a little different. This combo was the only one I found via trial and error with referencing the FR that accomplished getting boost control and cruise to work. My car also isn't standard at all, but I tried to remove other possibly influencing variables, delects and hacks. I will test this on a ko4 or ko4 car asap and report back.


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ddillenger

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	Re: me7.1 2.7t mafless error solution « Reply #6 on: October 12, 2015, 02:05:30 PM »

Quote from: Snow Trooper on October 12, 2015, 01:17:14 PM

The same hack for ME7.5 can be used here. It's just a TDMLMN hack IIRC.


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Snow Trooper

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	Re: me7.1 2.7t mafless error solution « Reply #7 on: October 12, 2015, 02:44:43 PM »

Quote from: ddillenger on October 12, 2015, 02:05:30 PM

The same hack for ME7.5 can be used here. It's just a TDMLMN hack IIRC.

I tried his exact hack and on my car I didn't have cruise or boost control. What do you see that I could do without?


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ddillenger

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	Re: me7.1 2.7t mafless error solution « Reply #8 on: October 12, 2015, 03:49:50 PM »

I never looked much into mafless on narrowband.

I have nothing constructive to say-haha.


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prj

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	Re: me7.1 2.7t mafless error solution « Reply #9 on: October 14, 2015, 01:33:09 PM »

Quote from: fukenbroken on October 12, 2015, 12:24:03 PM

in me7.5 i change a few bytes to prevent sending this b_error to CAN and zeros CLALM
doesnt know if its right way but ASR/ESP working good, no issues at all.

This is the best way to do this hack. Good job.
Proper way is sensor in inlet manifold Wink


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fknbrkn

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mk4 1.8T AUM

	Re: me7.1 2.7t mafless error solution « Reply #10 on: October 14, 2015, 02:15:09 PM »

Quote from: prj on October 14, 2015, 01:33:09 PM

This is the best way to do this hack. Good job.
Proper way is sensor in inlet manifold Wink

ok maybe im asking a stupid questions but why we need a load calculation by map sensor in the manifold?
seems that all working good - load calc, trims, o2 reg etc
and what a good point to start from? dissasembling some of 1.4 ECUs like AXP or BCA which uses map sensor to calc load?


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prj

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	Re: me7.1 2.7t mafless error solution « Reply #11 on: October 14, 2015, 04:17:31 PM »

Quote from: fukenbroken on October 14, 2015, 02:15:09 PM

ok maybe im asking a stupid questions but why we need a load calculation by map sensor in the manifold?

Because on part load there are several inaccuracy issues with load calculation via throttle plate.
Also the secondary load signal is not terribly accurate in all weather conditions.
Transients are not picked up as well either.

You are basically running alpha/n multiplied by pressure pre-tb... It's no substitute for speed density or mass-flow.


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seat20vt

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	Re: me7.1 2.7t mafless error solution « Reply #12 on: October 27, 2015, 08:11:43 AM »

Quote from: fukenbroken on October 12, 2015, 12:24:03 PM

in me7.5 i change a few bytes to prevent sending this b_error to CAN and zeros CLALM
doesnt know if its right way but ASR/ESP working good, no issues at all.

Is this can message error prevention done by cwmsrcan?
What is the exact name of b_error signal?


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mightemouce

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	Re: me7.1 2.7t mafless error solution « Reply #13 on: November 07, 2015, 04:48:24 PM »

I was messing around with this for a little bit tonight
When setting CLALM from 3 to 1 I was still getting p0102, setting it to 0 instead eliminated this.


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gt30avant

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	Re: me7.1 2.7t mafless error solution « Reply #14 on: November 08, 2015, 08:18:42 PM »

Is there anybody willing to give up the address of CLALM and location of B_error for ME7.5 (518AK). Or even just a simpler explanation of this process. thanks in advance


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