never done it...whats it actaully do?

 

Sometimes clears your CEL....

 

meaning what? does it give u any adavnatge?

 

It puts your ecu into a "learn mode"..
it establishes new fuel mixture and timing curves based on various sensors input..
It should be done after any modification IE: timing,fuel pressure,intake air velocity..
{Or something to that effect}

 

resets your ****, duh.......jkjk makes it so your computer starts from zero and feels your motor out again so it knows where things are

 

wow didnt know to do that after every mod, cool

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by misfithamster &raquo;</TD></TR><TR><TD CLASS="quote">wow didnt know to do that after every mod, cool</TD></TR></TABLE>

u dont HAVE to but every bit helps. Just make sure not to touch the gas pedal for a while after you turn it on...i forget how long it takes the ECU to learn... Anyone know?

 

From what I have read, After you reset it,
You should let it run until the fans come on without touching the gas pedal.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88DXCRX &raquo;</TD></TR><TR><TD CLASS="quote">From what I have read, After you reset it,
You should let it run until the fans come on without touching the gas pedal.</TD></TR></TABLE>

wow, thats mean a long long time?

 

I believe it's about 20 mins after warmup, from what I've heard.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88DXCRX &raquo;</TD></TR><TR><TD CLASS="quote">It puts your ecu into a "learn mode"..</TD></TR></TABLE>

If I am not mistaken I believe obdII even goes as far as to actually learn your driving habits. So grannies get good gas milage, teenagers get bad.jk

thats my dumbass post for today

 

Also if it is OBD 0 then it does not learn so no reason to "reset" other than to clear stored codes that are no longer valid (you fixed what was broke).

 

I believe there are still long term fuel trim corrections are there not?

 

Your supposed to do it with the engine already warmed up. So the fans would already be on. Pull the hazard fuse. Wait 10 seconds. Plug it back in. Start the car, let it run for 10 minutes, turn it off. Next time you turn it on it should be good to go.

 

Resetting the ECU clears your codes. But if something is still wrong than a code will re-appear. The ECU is programmed once when it was made, it doesnt "learn" at all, thats bullshit. If it doesnt like a mod or or something than it will keep throwing codes.

 

As far as I know... There is no learn mode on a CRX. It uses a base timing map that's stored in the ecu's ROM chip.

With the o2 sensor, tach, and TPS, the ecu will adjust the fuel mixture on the fly, a little bit to compensate for different temps and altitudes.

It will aslo use the cooant temp, crank position, etc to go from open loop (cold) mode, to closed loop (hot running) mode.

So after you reset it, it'll start using the base timing, and fuel maps it has stored. As you drive it'll adjust on the fly. No learning time, or warm up and down. That's B.S.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ef ***** &raquo;</TD></TR><TR><TD CLASS="quote">The ECU is programmed once when it was made, it doesnt "learn" at all, thats bullshit.</TD></TR></TABLE>

Funny, Hondata disagrees with your statement

Hondata closed loop vs open

Over the longterm the ECU adjusts the lambda multiplier factor for the injector firing duration. That's how it modifies the fuel maps - at least on OBDI, which is what the Hondata site is talking about. Again, I'm not sure about OBD0 but I know for a fact it happens on OBDI.

 

*I* never said anything about OBD-1.

 

I didn't say anything about your post.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tpr &raquo;</TD></TR><TR><TD CLASS="quote">Also if it is OBD 0 then it does not learn so no reason to "reset" other than to clear stored codes that are no longer valid (you fixed what was broke).</TD></TR></TABLE>


Thats exactly what I need to do. How do I reset my ECU?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by raene &raquo;</TD></TR><TR><TD CLASS="quote">

Funny, Hondata disagrees with your statement

Hondata closed loop vs open

Over the longterm the ECU adjusts the lambda multiplier factor for the injector firing duration. That's how it modifies the fuel maps - at least on OBDI, which is what the Hondata site is talking about. Again, I'm not sure about OBD0 but I know for a fact it happens on OBDI. </TD></TR></TABLE>

Guess what? He's talking about a stock ECU, not Hondata. Stock ECU's cannot learn, maybe Hondata. Not once was Hondata mentioned so why even bother bringing that up. Hondata is one thing I know nothing about....someone explain a little?

 

Hondata was referring to the function of a stock ECU in that article, which is why I mentioned it.

I don't see why a multiplicative lambda value in the Honda ECU is so hard to believe. Your computer that you're using to view H-T is far more complicated, sure, but it can store lambda values that vary over time. Even my wristwatch can store 50 pages of information.

Hell, even a microwave has an ECU that runs off of program code. If you've got program code and you've got a set of rewriteable registers, it's EASY to create a lambda multiplier. (BTW, I majored in CompSci).