how to reset ecu? - Honda Prelude Forum

Zelude · 01-31-2003, 05:32 AM

can someone tell me how to reset ecu? i just installed a jdm h22 into my si.. and i ran into a lot of problems..the car wont' even start now..no spark.

Satan_SRV · 01-31-2003, 06:10 AM

reset the ecu by disconnecting the battery, waiting a bitm and then reconnecting

19924ws · 01-31-2003, 06:37 AM

Quote:

Originally posted by Satan_SRV
reset the ecu by disconnecting the battery, waiting a bitm and then reconnecting

yup back to no spark huh?

sporttheimport · 01-31-2003, 07:40 AM

I have heard that to reset the ECU u want to disconnect the battery and then hit the brake so that all the brake lights come on. This makes sure that there is no power left in the car or something like that and truely resets. Can anyone clarify this for me?

thanks,
tim

willmbrk · 01-31-2003, 07:44 AM

Dunno, I was told to pull the 2 fuses and wait for about 30 seconds. Then put the fuses in, and start the car and let the car idle for 10-15 minutes. I would appreciate clarity, too

blahblahblah · 01-31-2003, 12:55 PM

I just disconnect the battery for like 10 minutes and then start the car and let it idle for about 10 minutes. I assume this works because when i let the car idle i can see the rpm go up and down as the ecu tries to recalibrate itself.

Zelude · 01-31-2003, 01:18 PM

thanks guys.. do you guys know why my car isn't getting spark? can it be the dist..or coil? any suggestion? sometimes the car can start. but after i give a little bit gas..the car starts to stall like slowly..

brendon2k · 01-31-2003, 01:42 PM

Quote:

Originally posted by Zelude
thanks guys.. do you guys know why my car isn't getting spark? can it be the dist..or coil? any suggestion? sometimes the car can start. but after i give a little bit gas..the car starts to stall like slowly..

i would check the cap and rotor to make sure that it is in working order. on my dads car i guess it wasnt tightened down enought when it was replaced and it came lose so the car wouldnt run. as far as testing the coil and distributer that is do-able. if all those things are working i wouldnt know.

LudedudeSi · 01-31-2003, 01:44 PM

Hmm i noticed there are 2 fuses for the ecu inside the car. i have the top one but the bottom one isnt there. whats that one for anyways??

concLude · 01-31-2003, 02:49 PM

can you reset your ECU by pulling the fuses? also do you disconnect the negative or positive terminal, or does it even matter, i'm just wondering if it will ground somewhere else.

dflipmode · 01-31-2003, 07:47 PM

in the service manual...it says you just have to pull the fuse for clock/radio in the underhood to reset the ecu..but not really sure if its correct..but thats what it says....pull it out for 10 secs...

and for your problem, is the car cranking at least and it just wont turn over ?....if that was the case, i had to replace the icm inside the distributor for mine...but i'm not really sure for the jdm h22 coz the one i had is for h23..

dennis

Zelude · 02-01-2003, 02:21 PM

my car can start sometimes like when the car been sitting over night, the next day it starts, as soon as car warmsup, i hit the gas pedal a few times, then the car starts to stall slowly(the engine sounds queit..queit.......stall), when i try to start it again, it won't start until the next day..what's wrong? anybody knows?
we checked the spark wire, there's no spark..why?

concLude · 02-02-2003, 08:43 AM

moisture under the distributer cap or somewhere else?

vipastyle · 02-02-2003, 08:57 AM

yea but dont touch certain spots on the distributor, it shox the fuk outta you, i kno from experience, it really hurts!

Ludesmurf · 02-02-2003, 10:25 AM

Check out this link about reseting the ECU.

http://www.landspeedracing.com/insta...4&displayDoc=1

irishpilot · 02-02-2003, 06:26 PM

to reset pull the

clock/radio fuse.

and to be sure also disc the battery???

I always reset the ecu by the fuse!