Idle Relearn Procedure | Honda S2000

I finally figured out the flickering issue when using GoPro clips so I should have that solved in future videos: )

Hey everyone, today I’m going to show you how to perform the idle relearn procedure on a Honda S2000. This can be useful to do after disconnecting the battery or cleaning the IACV. When I performed this myself I ran into some issues so I just want to make this clear for anyone that tries to do this.

Steps
1. The first thing you want to do is erase the ECU memory. The most common ways to do this are to disconnect the battery or to remove the back up fuse from the fusebox underneath the dashboard.
2. Once the battery is connected or the fuse is replaced you have to warm up the car. Before you start the car make sure there is no electrical load on the system. Make sure your headlights are off, the stereo is off, and any accessories are unplugged.
3. The shop manual suggests starting the car and pegging the car at 3000 RPM until the engine comes to operating temperature. I’m guessing this is suggested as the safest and most efficient way for a Honda technician to warm up the car in the repair bay. It is possible for the electronic power steering light to come on during this step as the system can think a fault exists in the system if the engine sustains a higher RPM without any steering input. Don’t be afraid of this. As soon as you take the car for a spin the light should disappear and the electronic power steering should come back.
4. Once the engine is warm, let the idle for about 5 minutes. This is when the ECU is actually relearning how to idle the car properly.
5. Once enough time has passed make sure the idle is operating normally. Rev the car a few times and ensure that the idle does not drop below roughly 800 RPM. Take the car for a spin to get rid of any potential electronic power steering lights..

[redtvme]

thanks, just bought my first s2000, and noticed every time I let the throttle off i️t bogged down to around 400-500 RPM. This fixed my car, thanks guys!!

[ryanott]

i just bought a s2k and have watched and loved all your videos, you are the chris fix but for s2k owners, thank you!!!

[robertbessette]

This was terrific. Idle was racing all last season but I endured it because I didn't go out much with the pandemic. This year i was determined to do something about it. I was even thinking about taking it to a shop. Fortunately, I came across this video! While watching the video, I had an epiphany - Crap! this was a self inflicted problem. I swapped out the battery at the beginning of last season and never properly reset the ecu! Thanks to you it is now properly rest!

[justink]

Thank you for the very well made and short video. Got my girl running strong again from a bunch of your how tos. Saved me big time. Keep up the amazing work, your the s2k owners best friend :)

[zpzp]

thank you for the simple and nice video! I need to clean my ICV and probably do this. Mine sometimes dips too low.

[kimlevi]

Please keep doing these videos. They're beyond helpful. Thanks

[TheWhiteAfghan]

Got ready to clean the iacv after some work on the S since idle was horrible then I came across this... You sir save me lots of time and headache 👍

[adrianarteaga]

Little late to the party but came across this issue with my ap1 and this solved It 👌🏼 big ups my brotha!

[redkobe]

worked like a charm, thanks for helping fixing my idling issues

[chrisjay]

Thanks yet again for coming to the rescue 🙂

[mistaanime]

wow.. this is awesome. wish this was done long time ago hah. i just hated resetting my car because it would throw the revs off.

[anthonyjanelle]

Lately my AP1 s2000 has been stalling when I’m driving and push in the clutch to shift gears … the funny thing is I have no actual Idle problems when the car is parked/ stationary, idles at 800ish rpm’s smoothly … I had cleaned the MAP sensor and it was good for about 2 weeks … now it stalls again when driving

[richardmahood]

You got a name brand for that cluster lol it’s sexy as hell

[simonicktoretto]

Ciao. Ti seguo dall’Italia, complimenti per il video. Ho provato a fare la procedura, ma il relearning non si avvia.

[loganmilks]

It’s not helping my idle still, I just cleaned the IACV and after that the revs just started bouncing rapidly from about 1600 to 1700 RPMs, and it won’t stop even after doing all this.

[skevo]

Every time i disconnect my battery in 2006+ the idle re learn must do it again????

[jaspervillejo]

Hey diy person, i have a code p0505 for the iacv, i tried cleaning it but its still idling weird, my idle keeps going up and down every second like its revving itself, should i just replace the iacv?

[stephanopapadimitriou]

Is this relearning process only for Honda or can it work for other makes and models?

[FBBYLEE]

I'm a noob, can someone tell me why this is needed? Is it only for AP1's?

[rightfight]

Does this work with aftermarket ECU’s like Haltech?