ECU reset after Break-In - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

paros28 · 10-06-2012, 01:05 PM

Is it a good idea to reset the ECU (disconnect/reconnect battery) after break-in (at 1000 miles/1600 Kms)?

CBR600RR · 10-06-2012, 01:25 PM

Ya sure why not.

zoomzoomers · 10-06-2012, 01:28 PM

My 2 cents here, but I don't see why people keep wanting to reset the ECU. The ECU is supposed to keep varying different variables of the vehicle based on the parameters set at the factory. Such as fuel/air ratios and other things. I'm no expert, but reseting will only just restart the process of it doing what it does. Reseting it won't change the parameters set at the factory.

Dunno maybe an expert can chime in here...

lordtakuban · 10-06-2012, 03:13 PM

Quote:

Originally Posted by zoomzoomers

My 2 cents here, but I don't see why people keep wanting to reset the ECU. The ECU is supposed to keep varying different variables of the vehicle based on the parameters set at the factory. Such as fuel/air ratios and other things. I'm no expert, but reseting will only just restart the process of it doing what it does. Reseting it won't change the parameters set at the factory.

Dunno maybe an expert can chime in here...

That's mostly right and I'm not necessarily an expert, but I do know quite a bit about ECU's.

Resetting the ECU will have it re-learn its parameters for things like how much fuel at what RPM and load can it run without causing knock within tolerances of the stock base maps.

I don't think you'll gain much benefit out of resetting your ECU after an oil change. It shouldn't cause much harm though. FWIW, I did not reset my ECU after doing an oil change.

jpit · 10-06-2012, 03:43 PM

Toyota and Subaru have said that the ECU learns during the first 100 miles and not all that much after that. They said that the reason for the rough idle and stalling that some drivers are experiencing is the result of the ECU trying to operate outside its original learning curve. Toyota is replacing ECUs and Subaru is reflashing theirs.

What I don't understand is if they tell you to keep the rpms under 4000 for the first 1000 miles how can the ECU accurately learn your driving habits?

http://www.motorauthority.com/news/1...stalling-issue

paros28 · 10-06-2012, 08:18 PM

Thanks all for your comments. Let me clarify. I don't have the CEL/Idle problem. And my rationale for ECU reset (not reflash) is that my driving pattern will change after break-in. I will be routinely going past 4000 rpms. So I'm thinking a reset would help the ECU re-learn my new driving pattern and adapt engine parameters accordingly.

jpit · 10-07-2012, 12:02 AM

If you read that article it appears that resetting the ECU will not do that much. It is why Toyota is replacing theirs and Subaru is reflashing theirs.

boead · 02-19-2013, 06:07 PM

Quote:

Originally Posted by jpit

Toyota and Subaru have said that the ECU learns during the first 100 miles and not all that much after that. They said that the reason for the rough idle and stalling that some drivers are experiencing is the result of the ECU trying to operate outside its original learning curve. Toyota is replacing ECUs and Subaru is reflashing theirs.

What I don't understand is if they tell you to keep the rpms under 4000 for the first 1000 miles how can the ECU accurately learn your driving habits?

http://www.motorauthority.com/news/1...stalling-issue

I wasn't afraid to rev the motor the first 100 miles. The pros do!
Ive had ALOT of cars in my time (showing my age!)

Ranatsu · 02-19-2013, 06:41 PM

Quote:

Originally Posted by jpit

Toyota and Subaru have said that the ECU learns during the first 100 miles and not all that much after that. They said that the reason for the rough idle and stalling that some drivers are experiencing is the result of the ECU trying to operate outside its original learning curve. Toyota is replacing ECUs and Subaru is reflashing theirs.

What I don't understand is if they tell you to keep the rpms under 4000 for the first 1000 miles how can the ECU accurately learn your driving habits?

http://www.motorauthority.com/news/1...stalling-issue

Usually after a certain RPM when the engine changes from closed to open loop, there is limited learning the ECU can do and compensate for. At that point it can really only add/pull timing and add/remove fuel based on the long term learning etc..

The ecu probably goes into open loop at 4000 rpm.

10-06-2012, 01:05 PM	#1
paros28 Member Join Date: Mar 2012 Drives: 2007 Toy Corolla, 2012 Subaru BRZ Location: Melbourne, Australia Posts: 54 Thanks: 129 Thanked 119 Times in 53 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	ECU reset after Break-In Is it a good idea to reset the ECU (disconnect/reconnect battery) after break-in (at 1000 miles/1600 Kms)?

10-06-2012, 01:28 PM	#3
zoomzoomers Senior Member Join Date: Nov 2011 Drives: 2013 Subaru SWP BRZ Limited 6AT Location: Darkside Posts: 1,862 Thanks: 526 Thanked 305 Times in 207 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	My 2 cents here, but I don't see why people keep wanting to reset the ECU. The ECU is supposed to keep varying different variables of the vehicle based on the parameters set at the factory. Such as fuel/air ratios and other things. I'm no expert, but reseting will only just restart the process of it doing what it does. Reseting it won't change the parameters set at the factory. Dunno maybe an expert can chime in here... __________________ Man Law#17:A man in the company of a hot, seductively dressed, woman MUST remain sober enough to fight! MODS: AVO tubes + filter, Cusco (F) strut brace w/ MC brace, Perrin CBE, Subaru OEM trunk tray, Grimmspeed front license re-locator & hood struts and Beatsonic rear cam.

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10-06-2012, 01:25 PM	#2
CBR600RR Senior Member Join Date: Jul 2012 Drives: Raven Black Location: Ottawa, Canada Posts: 1,343 Thanks: 451 Thanked 563 Times in 276 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Ya sure why not.

10-06-2012, 03:43 PM	#5
jpit Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Location: Port Angeles, WA Posts: 338 Thanks: 24 Thanked 234 Times in 86 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	Toyota and Subaru have said that the ECU learns during the first 100 miles and not all that much after that. They said that the reason for the rough idle and stalling that some drivers are experiencing is the result of the ECU trying to operate outside its original learning curve. Toyota is replacing ECUs and Subaru is reflashing theirs. What I don't understand is if they tell you to keep the rpms under 4000 for the first 1000 miles how can the ECU accurately learn your driving habits? http://www.motorauthority.com/news/1...stalling-issue

10-06-2012, 08:18 PM	#6
paros28 Member Join Date: Mar 2012 Drives: 2007 Toy Corolla, 2012 Subaru BRZ Location: Melbourne, Australia Posts: 54 Thanks: 129 Thanked 119 Times in 53 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks all for your comments. Let me clarify. I don't have the CEL/Idle problem. And my rationale for ECU reset (not reflash) is that my driving pattern will change after break-in. I will be routinely going past 4000 rpms. So I'm thinking a reset would help the ECU re-learn my new driving pattern and adapt engine parameters accordingly.

10-07-2012, 12:02 AM	#7
jpit Senior Member Join Date: Jun 2012 Drives: Subaru BRZ Location: Port Angeles, WA Posts: 338 Thanks: 24 Thanked 234 Times in 86 Posts Mentioned: 22 Post(s) Tagged: 1 Thread(s)	If you read that article it appears that resetting the ECU will not do that much. It is why Toyota is replacing theirs and Subaru is reflashing theirs.

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