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What dose the ECU remember and 4 how long? #329280 Nov 17, 5:40pm Nov 17, 5:40pm
Joined: Dec 2003
Posts: 487
Portland, Oregon
GTS2003BLK OP
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2003 Toyota Celica
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2003 Toyota Celica

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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?

Re: What dose the ECU remember and 4 how long? [Re: GTS2003BLK] #329281 Nov 17, 5:42pm Nov 17, 5:42pm
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Orange County, Ca
RevMonster
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RevMonster

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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
Re: What dose the ECU remember and 4 how long? [Re: RevMonster] #329282 Nov 17, 6:16pm Nov 17, 6:16pm
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Umm wouldnt resetting the ECU elimate what gear you last shifted at ???

Re: What dose the ECU remember and 4 how long? [Re: RookieGTS] #329283 Nov 17, 6:23pm Nov 17, 6:23pm
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Portland, Oregon
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GTS2003BLK OP

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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.

Re: What dose the ECU remember and 4 how long? [Re: GTS2003BLK] #329284 Nov 17, 6:26pm Nov 17, 6:26pm
Joined: May 2004
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925 Nor Cal
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RookieGTS

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yeah then im just as clueless as you are...

Re: What dose the ECU remember and 4 how long? [Re: RookieGTS] #329285 Nov 18, 4:48pm Nov 18, 4:48pm
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Eastern Ontario, Canada
00GTShope
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00GTShope

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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

Re: What dose the ECU remember and 4 how long? [Re: 00GTShope] #329286 Nov 18, 4:55pm Nov 18, 4:55pm
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Columbus, Ohio
FastCelicaGT22
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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"
Re: What dose the ECU remember and 4 how long? [Re: FastCelicaGT22] #329287 Nov 18, 7:50pm Nov 18, 7:50pm
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Tempe, AZ
renfield90
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2001 Toyota Celica GT
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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.

Re: What dose the ECU remember and 4 how long? [Re: renfield90] #329288 Nov 18, 7:56pm Nov 18, 7:56pm
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anyone else got an answer for us?? because i wanna know too?

Re: What dose the ECU remember and 4 how long? [Re: RookieGTS] #329289 Nov 18, 9:06pm Nov 18, 9:06pm
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Maryland
2000 Silver Toyota Celica GT Matt007
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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

Re: What dose the ECU remember and 4 how long? [Re: Matt007] #329290 Nov 18, 9:10pm Nov 18, 9:10pm
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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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