re-learning ecm? - Toyota Yaris Forums

peewee1 · 06-13-2013, 12:00 PM

Am I to understand that there is a way to make my ecm (the cars computer) re learn my driving habits? My 2009 Yaris S is a used vehicle and I have no idea how it was driven by the previous owner. I would like to have my car react to my habits not some lead foot!!!

CTScott · 06-13-2013, 01:06 PM

The ECM can be made to re-learn the short term fuel trims, by simply disconnecting the negative battery terminal for a couple of minutes. As far as re-learning shifting patterns relative to your driving style - That requires resetting the automatic transmission control within the ECM via the Toyota TechStream tool. I did that on my 09 about two weeks after I installed my Blitz Supercharger and noticed that once I did so the tranny shift points seemed better relative to the extra boost from the S/C.

caineroad · 07-17-2013, 09:30 PM

Quote:

Originally Posted by CTScott

The ECM can be made to re-learn the short term fuel trims, by simply disconnecting the negative battery terminal for a couple of minutes. As far as re-learning shifting patterns relative to your driving style - That requires resetting the automatic transmission control within the ECM via the Toyota TechStream tool. I did that on my 09 about two weeks after I installed my Blitz Supercharger and noticed that once I did so the tranny shift points seemed better relative to the extra boost from the S/C.

Can we use the same tool to create a 'sport mode' type of thing, where it will keeps the rev high?

CTScott · 07-17-2013, 10:48 PM

Quote:

Originally Posted by caineroad

Can we use the same tool to create a 'sport mode' type of thing, where it will keeps the rev high?

To some extent yes. If you reset the ECM's tranny control and then drive it like you stole it the ECM should learn that shifting behavior.

caineroad · 07-17-2013, 10:59 PM

I see... I wonder if is it possible to individually set each gear shift point using the techstream tool? or the minimum speed for cruise control?

CTScott · 07-18-2013, 06:04 AM

Quote:

Originally Posted by caineroad

I see... I wonder if is it possible to individually set each gear shift point using the techstream tool? or the minimum speed for cruise control?

No

jcboy · 07-18-2013, 11:33 PM

curious question CTScott, is it good for a manual tranny? I drive normally, but because of inconsistent fuel economy figures sometimes on a drive it like a stole it manner (some nights/highway).

I still can't figure out the best shifting points that will keep fuel economy figures high. the manual states the best shift points but they're usually on 3k rpm point. are those accurate? or should i unplug the negative terminal then drive normal 100% (or for most of the time)?

CTScott · 07-19-2013, 08:14 AM

Quote:

Originally Posted by jcboy

curious question CTScott, is it good for a manual tranny? I drive normally, but because of inconsistent fuel economy figures sometimes on a drive it like a stole it manner (some nights/highway).

I still can't figure out the best shifting points that will keep fuel economy figures high. the manual states the best shift points but they're usually on 3k rpm point. are those accurate? or should i unplug the negative terminal then drive normal 100% (or for most of the time)?

The tranny related reset is purely for the AT. If you do a throttle body and/or MAF cleaning, doing the battery disconnect reset is a good idea to reset the fuel trims.

jcboy · 07-20-2013, 02:45 AM

oh i see. so i guess it's the inconsistent city traffic that i don't notice anymore (been living and driving in the city for more than a decade). sigh.

thanks a bunch scott! i wish there was a filipino version of you here. :)

06-13-2013, 12:00 PM	#1
peewee1 PEEWEE1 Drives: 2009 yaris s sedan Join Date: Apr 2013 Location: New York Posts: 55	re-learning ecm? Am I to understand that there is a way to make my ecm (the cars computer) re learn my driving habits? My 2009 Yaris S is a used vehicle and I have no idea how it was driven by the previous owner. I would like to have my car react to my habits not some lead foot!!!

06-13-2013, 01:06 PM	#2
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The ECM can be made to re-learn the short term fuel trims, by simply disconnecting the negative battery terminal for a couple of minutes. As far as re-learning shifting patterns relative to your driving style - That requires resetting the automatic transmission control within the ECM via the Toyota TechStream tool. I did that on my 09 about two weeks after I installed my Blitz Supercharger and noticed that once I did so the tranny shift points seemed better relative to the extra boost from the S/C. __________________

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07-17-2013, 10:59 PM	#5
caineroad Drives: 06 Yaris HB CE Join Date: Aug 2009 Location: Toronto Posts: 501	I see... I wonder if is it possible to individually set each gear shift point using the techstream tool? or the minimum speed for cruise control?

07-18-2013, 11:33 PM	#7
jcboy Drives: Sedan 07 Join Date: Oct 2012 Location: Asia Posts: 478	curious question CTScott, is it good for a manual tranny? I drive normally, but because of inconsistent fuel economy figures sometimes on a drive it like a stole it manner (some nights/highway). I still can't figure out the best shifting points that will keep fuel economy figures high. the manual states the best shift points but they're usually on 3k rpm point. are those accurate? or should i unplug the negative terminal then drive normal 100% (or for most of the time)?

07-20-2013, 02:45 AM	#9
jcboy Drives: Sedan 07 Join Date: Oct 2012 Location: Asia Posts: 478	oh i see. so i guess it's the inconsistent city traffic that i don't notice anymore (been living and driving in the city for more than a decade). sigh. thanks a bunch scott! i wish there was a filipino version of you here. :)