Honda Civic (2001 - 2005) Coupe / Sedan / Hybrid (Includes Acura EL)

ECU Reset and Idle Relearn

 
Old 07-27-2011, 06:37 AM
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Default ECU Reset and Idle Relearn

Can I get the proper procedure to reset the ecu and do the idle relearn?
Does the car have to be cold at the start of the procedure?
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Old 07-27-2011, 09:47 AM
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Default Re: ECU Reset and Idle Relearn

I've usually done it after the engine/coolant was already warm, but either way will work. (I've done it both ways)

Remove fuse #6 from the fuse box under the hood. Wait a minute, then reinstall it. (or just disconnect the battery)
With everything electrical turned off (radio, wipers, heat/ac, etc.) - Start the car and hold the idle at 3,000 RPM until the radiator fan comes on.
Release the accelerator and let the car idle for five minutes. (not including the radiator fan run time)
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Old 07-27-2011, 10:13 AM
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Default Re: ECU Reset and Idle Relearn

Thanks again.

Is there a procedure for setting the throttle stop screw properly? Upon inspection I found that it had been tampered with by previous owner (backed off completely to fully close throttle valve, probably as a half *** attempt to fix for the high idle)
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Old 07-27-2011, 03:55 PM
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Default Re: ECU Reset and Idle Relearn

To be honest, I don't know if they calibrate it somehow or just do it by eye. I've never had to do it, never asked about it, and never fooled with mine.
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Old 04-26-2014, 05:34 PM
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Default Re: ECU Reset and Idle Relearn

Originally Posted by It Wasn't Me View Post
I've usually done it after the engine/coolant was already warm, but either way will work. (I've done it both ways)

Remove fuse #6 from the fuse box under the hood. Wait a minute, then reinstall it. (or just disconnect the battery)
With everything electrical turned off (radio, wipers, heat/ac, etc.) - Start the car and hold the idle at 3,000 RPM until the radiator fan comes on.
Release the accelerator and let the car idle for five minutes. (not including the radiator fan run time)
how long remove the battery post
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Old 04-26-2014, 06:29 PM
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Default Re: ECU Reset and Idle Relearn

Originally Posted by jorge75 View Post
how long remove the battery post
A few minutes is more then sufficient.
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Old 03-19-2019, 07:25 PM
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Default Re: ECU Reset and Idle Relearn

So do I have to keep it at a steady rpm or not cause when I'm doing it it doesn't stay at 3k
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Old 03-20-2019, 08:47 AM
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Default Re: ECU Reset and Idle Relearn

PCM Idle Learn Procedure

For the PCM to learn the engine idle characteristics, this procedure must be done.
Procedure:
1. Make sure all electrical items (A/C, audio, rear
window defogger, lights, etc.,) are off.
2. Start the engine, and hold it at 3,000 rpm with no
load (in Park or neutral) until the radiator fan comes
on, or until the engine coolant temperature reaches
194F (90C).
3. Let the engine idle for a minimum of 5 minutes with
no load.
NOTE: If the radiator fan cycles during this time, do
not include its running time in the 5 minutes.
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Old 03-21-2019, 02:42 PM
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Default Re: ECU Reset and Idle Relearn

I have had the battery out or disconnected plenty of times, and never did this. Seems unnecessary. My car has always idled just fine.
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Old 03-27-2019, 12:05 PM
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Default Re: ECU Reset and Idle Relearn

Originally Posted by jorge75 View Post
how long remove the battery post
2-5 minutes.
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