ECU adaptation

[dave330i]

If I have a code ...CEL light..., and I have AA software on my ECU since the SC install, if I have to reset the code, A) do I need to have it done on a GT1...my hand OBDII didi not seem to clear it...also b) will it ruin my AA software for the SC? I need to resett a code that I have had for so long I cannot remember.

[MachRc]

it wont ruin your software if your clearing a code, if your doing a some bulletin update at the dealer then you shouldn't

are you using a universal scanner?

[dave330i]

Yes, My friend has a little $60 hand held code reader...I can also go to a Midas and have another friend try on his reader, its a little better than the $60 one...its a MAF code I have been trying to get help with but my posts have gotten no response...P0102 is the code, low voltage input MAF...changed it with a new one and still there, car is running a little worse all the time, I have a new one coming , I just put this one in like 2 weeks ago...cannot get rid of the light...I would like to have the car checked but I am worried about the ECU losing its AA reprogramming, this is my first BMW and I am still trying to learn how it works as far as things like the computer..

[dave330i]

When changing any electrical parts,I.E. MAF sensor, is the car supposed to recognize it and clear a code or do I have to reset the adaptation if it is still lit up? if so , how is it done...more or less..

[TxZHP04]

When changing any electrical parts,I.E. MAF sensor, is the car supposed to recognize it and clear a code or do I have to reset the adaptation if it is still lit up? if so , how is it done...more or less..

Since you are still learning (as are most of us, actually)...

Once a code is stored, it will not go away until it is cleared. Diagnostic trouble codes are in no way related to the adaptations used by the fuel system's feedback control loop.

Since you have a stored code, you need to clear it out at this point and see if it returns. To be clear, you need to clear the trouble codes not reset your adaptations as this means something else entirely.

[dave330i]

Since you are still learning (as are most of us, actually)...

Once a code is stored, it will not go away until it is cleared. Diagnostic trouble codes are in no way related to the adaptations used by the fuel system's feedback control loop.

Since you have a stored code, you need to clear it out at this point and see if it returns. To be clear, you need to clear the trouble codes not reset your adaptations as this means something else entirely.

Thanks, I appreciate the info very much...my problem was the MAF p0102 (low voltage input)and I cleared it, no good, so I replaced it, and I did a check of the voltage and it was .30V/dc with the new MAF..I was told by AA that it should be 1.0V/dc at idle ( had to check the wires between the HFM Calibrator? and the MAF....I have another MAF on the way from the vendor since this new one is still throwing a code. When we tried to clear the code on the $60 OBDII jobber...it would not give a "green light" saying that it was cleared, just a "yellow" light, I for the life of me cannot get this resolved on my own, I am contemplating taking it somewhere, but I am not sure what they will do as not to ruin any programming done by AA when the ECU was sent back, I have contacted AA but only get 2-3 word answers back...was not too informative...I had other posts with no replies so I am trying to change my question as to be more "understood" ...if you will. The wires that connect the little black box (hfm?) between the MAF and the (DME?) are crimped connections and look OK, not sure if they would cause a voltage drop ....:hmm: They did tell me to remove the black box and hook the MAF up directly again to do something with the adaptation, but not to drive over 3500 RPM, i asked why and for how long but received no response from them....wires are not long enough..not sure what it would do either or for how long...

[MachRc]

its funny i made a thread about the code in 2004, but dont remember why it was thrown..

but definately was not the maf itself, but something else...

i highly recommend getting a better code reader like a peake research tool..im trying to remember what i did in 2004..other then cleaning the maf sensor with spray, checking all connections and fittings and resetting the code..but positive i didnt buy a new maf sensor.. istill have the stock one... maybe a plastic trim inside the maf broke casuing turbulence...i have the front mesh and plastic screen but the rear one was breaking so i ditched it..

[TxZHP04]

Thanks, I appreciate the info very much...my problem was the MAF p0102 (low voltage input)and I cleared it, no good, so I replaced it, and I did a check of the voltage and it was .30V/dc with the new MAF..I was told by AA that it should be 1.0V/dc at idle ( had to check the wires between the HFM Calibrator? and the MAF....I have another MAF on the way from the vendor since this new one is still throwing a code. When we tried to clear the code on the $60 OBDII jobber...it would not give a "green light" saying that it was cleared, just a "yellow" light, I for the life of me cannot get this resolved on my own, I am contemplating taking it somewhere, but I am not sure what they will do as not to ruin any programming done by AA when the ECU was sent back, I have contacted AA but only get 2-3 word answers back...was not too informative...I had other posts with no replies so I am trying to change my question as to be more "understood" ...if you will. The wires that connect the little black box (hfm?) between the MAF and the (DME?) are crimped connections and look OK, not sure if they would cause a voltage drop ....:hmm: They did tell me to remove the black box and hook the MAF up directly again to do something with the adaptation, but not to drive over 3500 RPM, i asked why and for how long but received no response from them....wires are not long enough..not sure what it would do either or for how long...

Short of completely reflashing your DME, there's really nothing a shop will do that would impact your AA tune. Clearing codes and standard diagnostic procedures won't impact your tuning. As long as the shop knows about your custom software, everything will be fine. Besides, you have a hardware issue so there should be no reason to reflash. Welcome to AA customer support.

[dave330i]

Short of completely reflashing your DME, there's really nothing a shop will do that would impact your AA tune. Clearing codes and standard diagnostic procedures won't impact your tuning. As long as the shop knows about your custom software, everything will be fine. Besides, you have a hardware issue so there should be no reason to reflash. Welcome to AA customer support.

Well I have to say I have been dealing with a company called aboveallmotorsports.com and they have been extremely great as far as the MAF, I told them I still had a code, they are sending me a new one with a call tag on the old one, no hassles, 2 questions though, if I did not clear the code, would the car still act as if it had the problem, also the MAF voltage being .30Vdc instead of 1.0Vdc per AA, would that be the failing MAF?

[TxZHP04]

2 questions though, if I did not clear the code, would the car still act as if it had the problem, also the MAF voltage being .30Vdc instead of 1.0Vdc per AA, would that be the failing MAF?

I can address the first question. A stored code means that either there is or was a problem. The computer detected it and kept a record which will remain there until cleared. The presence of a stored code has no impact on the current operation of the vehicle. The car will only act as if it still has the problem if it still has the problem. I can't address MAF voltages, especially in the context of an AA SC.

[dave330i]

I can address the first question. A stored code means that either there is or was a problem. The computer detected it and kept a record which will remain there until cleared. The presence of a stored code has no impact on the current operation of the vehicle. The car will only act as if it still has the problem if it still has the problem. I can't address MAF voltages, especially in the context of an AA SC.

Thanks for clearing the code question up....this is a frusrating issue for months now...

[dave330i]

its funny i made a thread about the code in 2004, but dont remember why it was thrown..

but definately was not the maf itself, but something else...

i highly recommend getting a better code reader like a peake research tool..im trying to remember what i did in 2004..other then cleaning the maf sensor with spray, checking all connections and fittings and resetting the code..but positive i didnt buy a new maf sensor.. istill have the stock one... maybe a plastic trim inside the maf broke casuing turbulence...i have the front mesh and plastic screen but the rear one was breaking so i ditched it..

I treid to find your od thread with no luck, any chance you remember some of it?

[performancenut]

Talk to AA; sometimes the "black box" that changes the MAF voltage signal to compensate for higher air flow can malfunction. I'd consider a swap of that item if all the connections are secure.

[dave330i]

AA has been a dead end, not very informative....they do not seem to care to much...