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How to conduct an ECU relearn?

Tiny
KOUBEAR
  • MEMBER
  • 2018 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 20,000 MILES
Does anyone know how would an ECU would take to relearn things after replacing a car battery and is there a way to confirm it?
Monday, October 25th, 2021 AT 1:11 PM

19 Replies

Tiny
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Hello,

After the battery is replaced, there are two procedures need to be performed.

1.Perform steering sensor zero-point calibration
2.Memorize steering angle neutral point

I have attached the both of those procedures below.

Please let me know of any questions.
Thank you.

https://www.2carpros.com/articles/how-to-replace-a-car-battery
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Monday, October 25th, 2021 AT 5:19 PM
Tiny
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Hi, what others procedure do I need to do or relearn? Will I still be able to get dtc code on my obd scanner even though I changed the battery because I did it and it says I got none?
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Thursday, October 28th, 2021 AT 3:10 AM
Tiny
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According to Toyota those are the two relearns needs to be done after a battery change.
As for the codes, if any issues still exist it will get triggered again and you will be able to read them.
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Thursday, October 28th, 2021 AT 8:51 AM
Tiny
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Okay, thanks. I read it should have cleared all existing code and I didn't use a memory saver or anything. I got the obd on Amazon and it says it was compatible but when I looked it up on their website it wasn't.
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Friday, October 29th, 2021 AT 5:21 AM
Tiny
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Curious what type of code reader was it? For just reading the codes, just about any of the OBDII readers will do that task. Unless you want to read live data or other programing function, which will require specific kind.
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Friday, October 29th, 2021 AT 6:37 AM
Tiny
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It's a Innova 3100rs Fixassist.
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Friday, October 29th, 2021 AT 11:39 AM
Tiny
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This is compatible with all the OBDII vehicles (1996 and newer).
So, it should work. I know this one can also do live data as well as airbag and ABS codes.
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Friday, October 29th, 2021 AT 12:39 PM
Tiny
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I thought so, maybe it's just me.
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Friday, October 29th, 2021 AT 1:34 PM
Tiny
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It is possible that the scanner itself has a bad cable or defective.
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Friday, October 29th, 2021 AT 1:36 PM
Tiny
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It's possible. Maybe.
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Friday, October 29th, 2021 AT 1:54 PM
Tiny
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Ran my obd scanner and this is what I founded:
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Friday, October 29th, 2021 AT 2:05 PM
Tiny
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Hey.
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Friday, October 29th, 2021 AT 8:51 PM
Tiny
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So those are historical codes. Are you currently having any specific issues?
Inactive code can be stored in the computer but that will not impact the drivability.
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Sunday, October 31st, 2021 AT 12:44 PM
Tiny
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I have no codes when I run my obd2 test, but I know it just doesn't feel the same I know there is an issue.
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Monday, November 1st, 2021 AT 11:13 AM
Tiny
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I have attached the reset procedure for the hybrid ECU below. Let me know if you are able to run through those steps.
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Tuesday, November 2nd, 2021 AT 5:58 PM
Tiny
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Hey, my car is not a hybrid? Will the same process still work? FYI my car is in the auto shop to fix my rear bumper damage.
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Friday, November 5th, 2021 AT 4:44 PM
Tiny
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Well, the code showed to be for the Hybrid Camry. And that procedure is for the ECU of the Hybrid system.
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Saturday, November 6th, 2021 AT 8:04 PM
Tiny
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Hmm, that's so weird.
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Friday, November 12th, 2021 AT 5:55 AM
Tiny
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So, is the check engine light currently illuminated? If so what are the codes?
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Friday, November 12th, 2021 AT 8:37 AM

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