Anatomy of the Honda ECU (or What makes your Honda

[Hondata]

The Honda ECU, like your Honda engine is a very well designed piece of equipment made to work in many cars under many varying conditions of temperature and altitude. This tech article looks at the functions of the ECU and and what makes it work so well.

*** Warning *** This article is technical in nature and may cause you to learn something.



http://www.hondata.com/techecuanatomy.html

Doug

[SuperTeg]

Thanks! That's good to know. [img]smile.gif[/img]

[JT98CivicEX]

Hey, that looks like a socketed P28. Thanks for the info.

<font color="#a62a2a" size="1">[ March 25, 2002 11:14 AM: Message edited by: JT98CivicEX ]</font>

[Hondata]

Our theory is that an educated person makes better tuning decisions for themselves - even if it is not using our product. So an important focus of our web site is education.

Doug

[rjaffey]

Doug,

From your description of the operation of the backup processor, am I to assume that "limp" mode is effectively an alpha-n system?

<font color="#a62a2a" size="1">[ March 25, 2002 09:50 PM: Message edited by: rjaffey ]</font>

[hypa]

Doug, that's beautiful!
And great timing, since I did my first datalog run on Saturday and finally saw the inside of a Honda ecu on Friday [img]smile.gif[/img]

[93SleepR]

You guys ROCK! no other company i'm aware of takes the time to really go into the technical side of things. They are far more interested in just selling you stuff. While i'm far more interested in learning something.

To be honest though you had me with your comment about idle speed and chaos theory. Describing a mis-calibrated TPS sensor as "a good example of a Lorenz attractor" just floored me. Most people wouldn't know a "lorenz attractor" if it was blowing them and i just know the barest outlines of chaos theory.

I'm impressed, Really really impressed! I just need to scrape toghether the cash to buy a stage 2B.

Come to think of it, My life is a pretty good example of Chaos Theory (or maybe Chaos Practice would be more accurate)

Mike

[Hondata]

We have not been able to completely verify it, but it seems that the only one sensor - TDC (top dead sensor ) is needed.

I unplugged virtually everything I could except the distributor - and it still ran, although badly.


Doug

[schwett]

so does this mean, in theory, that a car with no problems other than a fistful of bad sensors (and a good tdc sensor) would start up?

<BLOCKQUOTE><font size=2 face="Verdana, Helvetica, sans-serif">quote:</font><table border="0" width="90%" bgcolor="#333333" cellspacing="1" cellpadding="0"><tr><td width="100%"><table border="0" width="100%" cellspacing="0" cellpadding="2" bgcolor="#FF9900"><tr><td width="100%" bgcolor="#DDDDDD"><font size=2 face="Verdana, Helvetica, sans-serif">Originally posted by Hondata:
We have not been able to completely verify it, but it seems that the only one sensor - TDC (top dead sensor ) is needed.

I unplugged virtually everything I could except the distributor - and it still ran, although badly.


Doug</font></td></tr></table></td></tr></table></BLOCKQUOTE>

[rjaffey]

Doug,

What I was getting at related to the passage stating that the backup processor uses TPS and TDC only. Specifically, I'm concerned about the effect of the boost activated "TPS mod" or "TPS hack" that many folks are using to overcome tip in and part throttle driveability problems. The modification works well during normal operation, but if limp mode relies on TPS at all to determine fueling or timing, folks ought to be aware of it. Folks should definitely not be boosting in limp mode, but if it were to happen, TPS signal would go to WOT suddenly. Do you think this is an issue?