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Home > User Content > DIY / Install Guides > HOW TO: Reset ECU without battery disconnect

HOW TO: Reset ECU without battery disconnect

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hvtopiwala
Winter Park
Florida, US
  • Godlike Advisor
 Here is how to reset your ECU without disconnecting your battery. This is a solution for those who install new parts and do not want to risk losing their trip meter mileages, radio presents, and so on. Make sure the car is off and that the key is not in the ignition.
Open the hood and locate the "Engine Room Relay Box." This is the fuse/relay box in the engine bay. On the xA/xB, it is the black top box to the right of the engine bay.
Take the black cover off and flip it over to read the embossed diagram. You want to look for the EFI fuse (not RELAY). On the xA/xB, the EFI fuse is 15 Amps. On the tC, the EFI fuse is 20 Amps.
On the xA, the EFI fuse is #4:


On the xB, the EFI fuse is #12:

Using the fuse-puller (white piece of plastic in the box), pull the EFI fuse out and let it sit for 10-30 seconds.
Pop the fuse back in the EFI fuse socket. Make sure it is properly seated and is uniform with the other fuses.
Put the black cover back on.
Cross your fingers, start up the car, and hope you don't pull another CEL (Check Engine Light).
If you are successful in not pulling a CEL, I recommend you let the car for 5-10 minutes for good measure.

CREDIT SCIONLIFE
http://www.scionlife.com/forums/viewtopic.php?t=33062

[#] May 08, 2007 07:40pm
SquallLHeart
  • The Techie
 now since this is kinda a uhm... tC site...

how about you say which fuse number it is for us??

it's #14 for the EFI fuse, btw

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[#] May 09, 2007 12:19am
cmv138
Jamaica
New York, US
  • Tire Changer
 isnt the ECU fuse a 7.5 AMP which is located under the the dash?

[#] Dec 02, 2007 12:16am
SquallLHeart
  • The Techie
 that particular 7.5A fuse is for the ECU-IG..

which is for the fuel injection system, shift lock (a/t), electric cooling fan, the moonroof, abs....

yea.... it's something else.

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There's Strong, and then there's RETARD Strong.
Decelerate your life.
The Few, the Proud... (they never really tell you what they're really "proud" of, eh?)
Below All (USAF - Uncle Sam's Academic Failures)
[#] Dec 02, 2007 02:25pm
ShadowtC
  • Detailer
 Ok, I see it in the xA and the xB, now where is it on the tC?? Help...

[#] Jan 18, 2008 08:48am
tc1stgen
Killeen
Texas, US
  • Scion Guru
 Unless by xB he is reffering to the tC as well. The new xB's have the same engine so maybe it is the same fuse?!

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[#] Jan 18, 2008 10:08am
VIP_tC08
Fort Lauderdale
Florida, US
  • Godlike Advisor
 To reset the ECU on a tC, it's the 20amp fuse, maybe this diagram will help:





2008 // Flint Mica // tC
[#] Jan 22, 2008 04:17am
cubano5611
El Paso
Texas, US
  • Window Washer
tC_Whip08 wrote:
To reset the ECU on a tC, it's the 20amp fuse, maybe this diagram will help:



i only see a red X


[#] Feb 09, 2008 04:33am
tCdreamer87
New York
New York, US
  • Scion Guru
 here we go again, you guys know everything about these cars lol its great tho the help is definetly appreciated

[#] Feb 09, 2008 05:25am

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