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Joined: Dec 2003
Posts: 487
Senior Member 2003 Toyota Celica
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Senior Member
2003 Toyota Celica
Joined: Dec 2003
Posts: 487 |
What dose the Celica's ECU remember and for how long?
Hypothetical example:
If I go to the dealer with a transmission problem, can the dealer read the ECU's memory and find out that several months ago I shifted past redline, and then say that I abused the car and refuse to fix the problem under warranty?
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Joined: Oct 2003
Posts: 2,029 Likes: 1
Masta OC 2003 Toyota Celica
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Masta OC
2003 Toyota Celica
Joined: Oct 2003
Posts: 2,029 Likes: 1 |
Our car's ECU knows all and sees all. Ok really, I have no idea. 
I'm just a crosshair
I'm just a shot away from you
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Joined: May 2004
Posts: 2,971
Boobie Vision 2000 Toyota Celica
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Boobie Vision
2000 Toyota Celica
Joined: May 2004
Posts: 2,971 |
Umm wouldnt resetting the ECU elimate what gear you last shifted at ???
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Joined: Dec 2003
Posts: 487
Senior Member 2003 Toyota Celica
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Senior Member
2003 Toyota Celica
Joined: Dec 2003
Posts: 487 |
That's what I thought too, but many months ago I read something on this site to the effect of the ECU had a permanent memory, not sure if it's true or not and I can't find the post.
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Joined: May 2004
Posts: 2,971
Boobie Vision 2000 Toyota Celica
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Boobie Vision
2000 Toyota Celica
Joined: May 2004
Posts: 2,971 |
yeah then im just as clueless as you are...
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Joined: Sep 2003
Posts: 955
Senior Member 2000 Toyota Celica
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Senior Member
2000 Toyota Celica
Joined: Sep 2003
Posts: 955 |
when I had a problem the service manager at my local dealer said that pulling the ECU fuse would reset all the codes. Then once the CEL came on to come in and it would only read the codes since the reset. So I'm gonna say NO, it doesn't have a "forever memory". 
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Joined: Sep 2004
Posts: 754
Senior Member 2000 Toyota Celica GT
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Senior Member
2000 Toyota Celica GT
Joined: Sep 2004
Posts: 754 |
It recets when you turn the car off if it cannot compensate for a change in a perameter. You can unplug the battery and leave it sit for 15min insted of pulling the fuse. This will cause a reset. Cant do shit about it, unless you go aftermarket with the ecu
"If your not the lead Dog the View never Changes"
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Joined: May 2004
Posts: 528
Senior Member 2001 Toyota Celica GT
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Senior Member
2001 Toyota Celica GT
Joined: May 2004
Posts: 528 |
I've heard (on this site) that every CEL is permanently stored in the ECU, and cannot be reset. Resetting the ECU will erase the tuning maps your car has made, but not the CELs.
Conceivably if you had enough CELs some of the earlier ones might get deleted, or the new ones would not be stored, but I'm sure that would take a lot of CELs.
Correct me if I'm wrong.
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Joined: May 2004
Posts: 2,971
Boobie Vision 2000 Toyota Celica
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Boobie Vision
2000 Toyota Celica
Joined: May 2004
Posts: 2,971 |
anyone else got an answer for us?? because i wanna know too?
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Joined: Nov 2004
Posts: 12
Member 2000 Toyota Celica GT
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Member
2000 Toyota Celica GT
Joined: Nov 2004
Posts: 12 |
Every ECU has to at least comply with the OBDII standards and EPA laws. This means it has to keep MIL's (or CEL's) between 40 and 80 warm up periods following the shut-off of the CEL, depending upon the cause of the CEL. You can manually erase any of the trouble codes in its memory with a diagnostics scanner or by disconnecting the battery. I suppose it's possible that a manufacturer could make an ECU that permanantly stores data, but I don't see why if they don't have to by law. 
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Joined: Oct 2003
Posts: 1,154
Specialist 2003 Toyota Celica
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Specialist
2003 Toyota Celica
Joined: Oct 2003
Posts: 1,154 |
Every ECU has to at least comply with the OBDII standards and EPA laws. This means it has to keep MIL's (or CEL's) between 40 and 80 warm up periods following the shut-off of the CEL, depending upon the cause of the CEL. You can manually erase any of the trouble codes in its memory with a diagnostics scanner or by disconnecting the battery. I suppose it's possible that a manufacturer could make an ECU that permanantly stores data, but I don't see why if they don't have to by law. Thats right
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celly01
2001 Toyota Celica GT
San Antonio, Texas
Joined: August 2003
Thank you.: EverythingCelica.com, Vision Quest, Random: I am keeping my car after all!!! I finally made up my mind after our SA meet...
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