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Joined: Dec 2003
Posts: 487
GTS2003BLK
Senior Member
GTS2003BLK Nov 18, 12:40am - #329280 

Senior Member
2003 Toyota Celica

Joined: Dec 2003
Posts: 487
Portland, Oregon
What dose the ECU remember and 4 how long?

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?
Joined: Oct 2003
Posts: 2,030
RevMonster
Masta OC
RevMonster Nov 18, 12:42am - #329281 

Masta OC
2003 Toyota Celica

Joined: Oct 2003
Posts: 2,030
Orange County, Ca
Our car's ECU knows all and sees all.





Ok really, I have no idea. rofl

I'm just a crosshair
I'm just a shot away from you
Joined: May 2004
Posts: 2,979
RookieGTS
Boobie Vision
RookieGTS Nov 18, 1:16am - #329282 

Boobie Vision
2000 Toyota Celica

Joined: May 2004
Posts: 2,979
925 Nor Cal
Umm wouldnt resetting the ECU elimate what gear you last shifted at ???
Joined: Dec 2003
Posts: 487
GTS2003BLK
Senior Member
GTS2003BLK Nov 18, 1:23am - #329283 

Senior Member
2003 Toyota Celica

Joined: Dec 2003
Posts: 487
Portland, Oregon
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.
Joined: May 2004
Posts: 2,979
RookieGTS
Boobie Vision
RookieGTS Nov 18, 1:26am - #329284 

Boobie Vision
2000 Toyota Celica

Joined: May 2004
Posts: 2,979
925 Nor Cal
yeah then im just as clueless as you are...
Joined: Oct 2003
Posts: 955
00GTShope
Senior Member
00GTShope Nov 18, 11:48pm - #329285 

Senior Member
2000 Toyota Celica

Joined: Oct 2003
Posts: 955
Eastern Ontario, Canada
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". thumbsup
Joined: Sep 2004
Posts: 756
FastCelicaGT22
Senior Member
FastCelicaGT22 Nov 18, 11:55pm - #329286 

Senior Member
2000 Toyota Celica GT

Joined: Sep 2004
Posts: 756
Columbus, Ohio
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"
Joined: May 2004
Posts: 528
renfield90
Senior Member
renfield90 Nov 19, 2:50am - #329287 

Senior Member
2001 Toyota Celica GT

Joined: May 2004
Posts: 528
Tempe, AZ
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.
Joined: May 2004
Posts: 2,979
RookieGTS
Boobie Vision
RookieGTS Nov 19, 2:56am - #329288 

Boobie Vision
2000 Toyota Celica

Joined: May 2004
Posts: 2,979
925 Nor Cal
anyone else got an answer for us?? because i wanna know too?
Joined: Nov 2004
Posts: 12
Matt007
Member
Matt007 Nov 19, 4:06am - #329289 
2000 Silver Toyota Celica GT
Member
2000 Toyota Celica GT

Joined: Nov 2004
Posts: 12
Maryland
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. smile
Joined: Oct 2003
Posts: 1,154
Larry_GTS
Specialist
Larry_GTS Nov 19, 4:10am - #329290 
2003 Yellow/Red Toyota Celica
Specialist
2003 Toyota Celica

Joined: Oct 2003
Posts: 1,154
Texas
Originally Posted by Matt007
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. smile




Thats right thumbsup
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