Remove weird from my text and read the rest.

OBD functions with Haltech?

 

Yup, it is just a piggyback.

 

Great, didn´t know about that. Good stuff? Any members here using it?

 

I personally don't know what it is like, but yes there is someone running it.

https://www.s2ki.com/forums/index.php?showtopic=753559

 

Here is a link showing how to chip an OBD2 ECU. It states it'll work on '96-01 ECU's. That covers OBD2A and OBD2B ECU's.
http://www.autoserve.8m.com/OBD2Emu2.html

Seems OBD2 ECU's use WORM (write-once read many) chips.
This was because there was no external prom for the fuel/ign tables. It was burned right into the main processor and this had to be done when the chip was burned, and could only be done once.

 

Interesting... I think Nissan S14 use the same technique and that´s why that extra PCB and chip needed to be added to the ECU.

The problem is to read the information when you´re in there.

 

Techtom provides the chips I believe. Don't see a Honda application, but that doesn't mean there isn't one.
http://www.technosquareinc.com/index.html

Yoshio @ Japanese Automotive use to provide Toda chipped OBD2A ITR ECU's. They used a Techtom chip I believe.
http://www.japanese-auto.com/tuning.htm

May be worth inquiring with one of them.

 

Honda went cheap on the AP1 ecu and used a non-flashable processor. The processor can be jumpered to read an external ROM, but rewriting the entire code externally is tricky with no notes. There is some interest in it on PGMFI right now, but it's a small group of people on that ECU. There is a 96k dump of the firmware, but it's binary code, and will take quite a while to crack. The current way of mounting the rom is a pogo board over the processor.

 

I´ll ask my buddy if he want to try it, he´s doing many other car brands.

 

i was thinking about converting an s2000 to obd1 hahaha its cheap and works good.