ECU Reset (Without Disconnecting Battery) - Page 2 - Scionlife.com


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Old 08-06-2005, 05:36 PM   #21
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Quote:
Originally Posted by toastbox
Quote:
Originally Posted by Tito_Cruz
Oh, thanks! Although, I was actually looking for some kind of "landmark" that I could look for after reseting it to assure me that I did it right. I'm installing a CAI so I'm guessing a power gain would be something to lookout for. I'm guessing that If the engine doesn't run well anymore or my gas mileage dramatically drops...I can tell the ecu didn't reset....???
There really isn't any kind of landmark or anything. But trust me, if you pull that fuse at the beginning, and leave it out until you are done, the ECU will be reset.

Just remember to let the car idle for 5-10 minutes before you drive it. Regarding Gas mileage....most likely your first two tanks are gonna be significantly lower...I say that because when you hear how aggressive the new intake is, you're gonna jamming the gas all the time, and winding it up. I typically averaged about 23-24 or so in town, prior to the intake. MY first two tanks after wards were 20.x But that's because I was shifting at 4-5000 rpm's, not 2800. Once I got over the noise/aggressiveness, the gas mileage went back up to 23 ish.
Thanks! GREAT FEEDBACK!
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Old 08-07-2005, 07:08 AM   #22
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Glad to be of help
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Old 08-13-2005, 06:49 PM   #23
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Default YAY INTAKE!

I installed mine the other day and used this method to reset the ecu. If I had done it wrong and it didn't reset for any reason the CEL would've lit up right?
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Old 08-13-2005, 07:47 PM   #24
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I'm pretty sure, yes.
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Old 08-15-2005, 09:12 PM   #25
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Default wooopieee!

It worked like a charm...it's been running great! I was a little sceptic at first. Now, if there would be a diagram for the tc, I'm sure that would help out future installers alot. THANKS FOR THE HELP EVERYONE!
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Old 10-09-2005, 05:35 AM   #26
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can some explain why it's the EFI fuse and not the ECU-B fuse on the tC?
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Old 02-18-2006, 06:38 PM   #27
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Good info, i've tried before but never noticed a difference...but trying it after doing a few more things - def a difference. Good write up!!!
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Old 05-11-2006, 03:43 AM   #28
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well i just want to know what EFI fuse # for tC??

other than that very helpful info
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Old 05-13-2006, 05:55 PM   #29
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Aewsome post! I just changed to a K&N drop in filter and it caused a CEL. I knew there was a way to reset the ECU without loosing the clock, radio settings and such.

Thanks!!!
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Old 05-13-2006, 09:32 PM   #30
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cool i'll have to pull the fuse when i put in my CAI

good write up
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Old 07-02-2006, 11:15 PM   #31
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I have a tC and I did this twice. I looked at the back of the fuse box for the efi fuse. There are only two 20 fuses so you have to make sure you look at the fuse chart on the top where you got the fuse clips from. Then I took the fuse out and put it back in 20 seconds later. When I turned my car on it did not fix the cel issue. The second time I took it out I cleaned my car and then put it back in. Either it takes a few times to take it out or it has to be out longer. Someone that has a tC I would give it 10-15minutes then put it back in. See if that fixes the problem the first time.
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Old 07-03-2006, 01:26 PM   #32
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Default Re: ECU Reset Without Disconnecting Battery

Quote:
Originally Posted by mikochu
Here is how to reset your ECU without disconnecting your battery...
On the xA, the EFI fuse is #4:
On the xB, the EFI fuse is #12:
...
That is from the first post of this thread, and I think the fusebox diagrams are switched (interchanged). The first fusebox is the really xB's and the second fusebox is really the xA's. I don't think anyone has noticed this error yet.

I think the post would be correct if the diagrams were left in the same place and only this change was made:

On the xB, the EFI fuse is #4:
On the xA, the EFI fuse is #12:

Otherwise, my xB has an xA fusebox ;-)
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Old 07-03-2006, 01:59 PM   #33
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Default Re: ECU Reset Without Disconnecting Battery

Quote:
Originally Posted by vintage42
[

On the xB, the EFI fuse is #4:
On the xA, the EFI fuse is #12:

Otherwise, my xB has an xA fusebox ;-)
It's #4on my 2005 xA RS1.0. I had to reset the ECU 6 times after installing a K&N filter.
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Old 07-03-2006, 02:56 PM   #34
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Default Re: ECU Reset Without Disconnecting Battery

Quote:
Originally Posted by Epitrochoid
Quote:
Originally Posted by vintage42
[

On the xB, the EFI fuse is #4:
On the xA, the EFI fuse is #12:

Otherwise, my xB has an xA fusebox ;-)
It's #4on my 2005 xA RS1.0. I had to reset the ECU 6 times after installing a K&N filter.
Yes, I was not correcting the fuse numbers for either car. I was noting that the diagrams were transposed.

How did you know that you needed to reset the ECU even one time??

After I reset my ECU by pulling the #4 fuse, I just started up, warmed the engine for a mile, and then started winding it out in each gear at full throttle. To let the ECU educate itself about 93 octane, supposedly.

It accelerated so violently in 2nd I couldn't find the little tachometer in time to avoid 6000 rpm LOL.
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Old 07-03-2006, 03:20 PM   #35
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Default Re: ECU Reset Without Disconnecting Battery

[quote="vintage42"]

How did you know that you needed to reset the ECU even one time??

Itquote]

When I added the K&N it would throw a CEL (check engine light) which also deactivates the VSC abd ABS. Because the K&N is oiled the oil gets on the MAF and causes the CEL. After about 5 resets and spraying electronic cleaner on the MAF sensor the CELs went away.

Anytime you add an engine, intake or exhaust perfromance part you should reset the ECU.
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Old 08-28-2006, 01:53 PM   #36
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My VSC, Trac Off and Check Engine lights came on today for no apparent reason. I pulled the fuse for one minute replaced it and started the car and all is well. Great write-up.
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Old 08-28-2006, 02:39 PM   #37
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I have to agree it was a good write up. Does anyone know what makes the car do this though??
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Old 09-08-2006, 09:30 PM   #38
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can someone clarify what fuse to take out for the tc? after installing my CAI, my car still feels the same as stock... will pulling out the fuse help fix it?
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Old 10-20-2006, 04:47 AM   #39
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yes please verify what fuse # it is that you pull out of the tc
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Old 10-20-2006, 06:45 AM   #40
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ive also heard that if you have your stock headers cat, to knock out a piece of the catalyst and put it between the 2 antifowlers, but sense i dont have the cat, would there be anything else that could work just as well as the catalyst?
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