how do you properly reset the ecu - Honda Civic Forum



7th Generation Civic In the years from 2001 to 2005 Honda released it's 7th Generation Civic. Chassis codes: EM2, ES1, EP3, EU1

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Old 06-22-2009   #1
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how do you properly reset the ecu

ive looked at multiple sites and have gotten multiple answers like disconnect the battery and pump the brakes ten times then connect the battery and let idle till warm, connect battery and go to 3000rpms for 2 minutes ,drive on roads and highway for half an hour while turning on all electrical accessories . plus many more so what's the proper way ????
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Old 06-22-2009   #2
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Re: how do you properly reset the ecu

1. drive car til its warmed up.
2. turn car off, disconnect battery or pull FI ECU fuse out.
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 10 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.

this is basically how the honda service manual says to do it. and its only done to correct idle problems caused by tinkering and taking apart intake throttle body and related sensors. this really is called "idle learn" procedure, which is essentially what you are doing by relearning the idle speed of 700 rpms.

heres the fuse

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Old 06-22-2009   #3
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Re: how do you properly reset the ecu

1. drive car til its warmed up.
2. turn car off, disconnect battery or pull FI ECU fuse out.
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 10 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.

this is basically how the honda service manual says to do it. and its only done to correct idle problems caused by tinkering and taking apart intake throttle body and related sensors. this really is called "idle learn" procedure, which is essentially what you are doing by relearning the idle speed of 700 rpms.

heres the fuse

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Old 06-22-2009   #4
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Re: how do you properly reset the ecu

what kind of gas should i use does it matter much ???
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Old 06-22-2009   #5
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Re: how do you properly reset the ecu

whatever you normally use. our cars were meant for 87 octane anyways. you don't want to "idle learn" your car for 91 when you pump 87 in it everyday.
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Old 06-22-2009   #6
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Re: how do you properly reset the ecu

the motor runs best on 87 octane and makes more power while operating cleaner. using the wrong octane will cause the ecu to adjust the timing and you will get worse power and mileage while clogging the engine with carbon buildup since 89-93 is too hard for our low compression motor to burn properly.
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Old 06-22-2009   #7
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Re: how do you properly reset the ecu

once again gearbox comes threw with the info . very much appreciated .
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Old 03-18-2013   #8
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Re: how do you properly reset the ecu

why ia their so many ways
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Old 03-18-2013   #9
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Re: how do you properly reset the ecu

Quote:
Originally Posted by lowlife9 View Post
ive looked at multiple sites and have gotten multiple answers like disconnect the battery and pump the brakes ten times then connect the battery and let idle till warm, connect battery and go to 3000rpms for 2 minutes ,drive on roads and highway for half an hour while turning on all electrical accessories . plus many more so what's the proper way ????
WOW like crazy man
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Old 03-18-2013   #10
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Re: how do you properly reset the ecu

4 year thread revival...
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Old 11-21-2015   #11
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Re: how do you properly reset the ecu

Quote:
Originally Posted by gearbox View Post
1. drive car til its warmed up.
2. turn car off, disconnect battery or pull FI ECU fuse out.
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 10 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.

this is basically how the honda service manual says to do it. and its only done to correct idle problems caused by tinkering and taking apart intake throttle body and related sensors. this really is called "idle learn" procedure, which is essentially what you are doing by relearning the idle speed of 700 rpms.

heres the fuse

That Fuse is F6, not F1, on my 2001 7th Gen Civic EX.
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Old 11-21-2015   #12
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Re: how do you properly reset the ecu

Quote:
Originally Posted by gearbox View Post
1. drive car til its warmed up.
2. turn car off, disconnect battery or pull FI ECU fuse out.
3. put fuse back, start car, close hood
4. make sure all accessories are off, do not press any gas or brake
5. just let the car idle for 10 mins by itself
6. turn car off, then back on, and go for a drive like you normally do. it will take usually one tank of gas to completely relearn the fuel trims.

this is basically how the honda service manual says to do it. and its only done to correct idle problems caused by tinkering and taking apart intake throttle body and related sensors. this really is called "idle learn" procedure, which is essentially what you are doing by relearning the idle speed of 700 rpms.

heres the fuse

You need to let it sit overnight, or hold the brakes until the light goes out. Just pulling it and putting it back in will not erase anything. I have always been told to pull the battery cable not the fuse.
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Old 11-21-2015   #13
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Re: how do you properly reset the ecu

Quote:
Originally Posted by gearbox View Post
the motor runs best on 87 octane and makes more power while operating cleaner. using the wrong octane will cause the ecu to adjust the timing and you will get worse power and mileage while clogging the engine with carbon buildup since 89-93 is too hard for our low compression motor to burn properly.
False: High octane gas is not harmful to a low compression engine, it is a waste a money though. Just use what the manual says and you will be good.

Wow this thread is 6 years old.
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Old 11-21-2015   #14
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Re: how do you properly reset the ecu

6 years old ang going strong lol dam i have learned so much since posting that thread that was one of my first.
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Old 04-03-2016   #15
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Re: how do you properly reset the ecu

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6 years old ang going strong lol dam i have learned so much since posting that thread that was one of my first.
So what is the correct method of resetting the ecu or which method did you end up using? i know this is an old tread but i just made the mistake of buying a 2001 civic lx as an emergency "temporary" but end up having to keep it
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Old 04-06-2016   #16
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Re: how do you properly reset the ecu

i did gearboxs method just disconnected the battery for about 60 min. either way your car will eventually learn itself,this method just takes less time for the computer to re-learn.
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Old 07-22-2016   #17
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Re: how do you properly reset the ecu

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i did gearboxs method just disconnected the battery for about 60 min. either way your car will eventually learn itself,this method just takes less time for the computer to re-learn.
So you are saying that all you gotta do is disconnect the whole battery and leave it off for 60 minutes and that will reset it
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Old 07-26-2016   #18
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Re: how do you properly reset the ecu

Just pull the fuse, wait 10 mins put it back in, then do the re-learn. done... much easier than pulling battery cables
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Old 07-27-2016   #19
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Re: how do you properly reset the ecu

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Just pull the fuse, wait 10 mins put it back in, then do the re-learn. done... much easier than pulling battery cables
Should i have the key in at all
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Old 07-27-2016   #20
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Re: how do you properly reset the ecu

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Should i have the key in at all
Nope.. Just car off, pull fuse wait 10 mins or so till the computer capacitors are out of juice and then plug it back in. and follow the steps of the diy
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Old 1 Week Ago   #21
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Re: how do you properly reset the ecu

Pdf guide to perform an idle relearn.
Attached Files
File Type: pdf Idle relearn AII25460.pdf (201.3 KB, 37 views)
File Type: pdf idle relearn.pdf (80.3 KB, 24 views)
File Type: pdf Honda Relearn procedures.pdf (1.23 MB, 43 views)
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