Project: ECU Database

Well, I'm a dick. :Owned2:

I don't know why but this PJ0 ECU didn't like the 27C512 ROM that I used for the PK2 code.

I tried it with the original PH3 ROM (256k) and I didn't get a solid CEL. Instead, I got a code 15 (Ignition output signal)

No surprise here since the PJ0 doesn't have any output for this..... YET :D

This means the PJ0 isn't a hopeless platform, at least the cali emissions. I have yet to figure out about the Matsushita one. With slight mods, the PJ0 could maybe use the same code as a PM6, PH3 or PK2


Stay tuned.

alright, now it's getting interesting! glad you finally got the ecu.

Well, I noticed that one of the 2 wires for the crank, cyl and TDC sensor are all wired together on the PK2 and PH3 ecus and they are just not connected to anything on the PJ0 !! This is pin B12, C2 and C4.

The wire is there, it's present on the dizzy, it goes to the ecu but the ECU just doesn't use them. They are basicaly a ground. My question is, WHY?!? why would they take the time to put a wire if it's to ground it anyway.

This leaves me with only 1 wire to add for the crank sensor on a PJ0 tough. It sure has alot of stuff connected to it so I don't know if I'll ever be able to add it but who knows.

Carotman look what's on Ebay http://cgi.ebay.com/ebaymotors/JDM-H...QQcmdZViewItem

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Originally Posted by carotman

Well, I noticed that one of the 2 wires for the crank, cyl and TDC sensor are all wired together on the PK2 and PH3 ecus and they are just not connected to anything on the PJ0 !! This is pin B12, C2 and C4.

The wire is there, it's present on the dizzy, it goes to the ecu but the ECU just doesn't use them. They are basicaly a ground. My question is, WHY?!? why would they take the time to put a wire if it's to ground it anyway.

This leaves me with only 1 wire to add for the crank sensor on a PJ0 tough. It sure has alot of stuff connected to it so I don't know if I'll ever be able to add it but who knows.

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sorry, i'm not quite following you. the pjo makes use of the cylinder and TDC sensor, right? so which wire are you talking about that is only a ground? and is pin B12 connected to the ecu circuitry on the pjo?

Nice PH3 on Ebay. I wonder if it's any different from the one I have. If no one buys it, I gues I'll get this one too and compare both electricaly and also the Code. This way, we can be 100% sure if there'S a difference between the auto and the manual ECU.

Strugglebucket, I wanted to add a crank sensor to the PJ0 (if it's even possible) and I noticed that one of the 2 wires for the crank sensor is connected to ground on the other Honda ECUs. In fact, the Crank,Cyl and TDC sensor all have one lead connected to ground.

hmm. maybe the timing is more precise with a common ground on an equal path as the switch?

Carotman check this out http://cgi.ebay.com/ebaymotors/ws/eB..._BIN_Stores_IT

Hmmm, the guys says it's not a simple rechip. However, the ECU looks just too OEM to me. I mean, the sticker is a OEM Honda. I'm sure this part number matches one at the US Honda dealer.

I sent him a message asking him for more pictures. If he's legit, we'll have pictures. If not... well you know what to do.

He send out the ecu out to reprogram the stock rom with the mugem program so the ecu looks stock.

Well, that's exactly what I'm talking about. This "Mugen" program (if it's really from Mugen) can be bought for dirt cheap on ebay. There's no point in asking 200 bucks for this.

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Originally Posted by carotman

Well, that's exactly what I'm talking about. This "Mugen" program (if it's really from Mugen) can be bought for dirt cheap on ebay. There's no point in asking 200 bucks for this.

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where did you get your rom reader from i will buy one and the ecu off ebay to .

Yeah i'm kinda interested in a rom reader now too.... since all this talk converts to 2nd gen prelude ecus too....

carotman, i'm still looking into how long those 4 similar pieces of code are. They are the same for the 25 bytes they take up. I'd be curious also what they stand for. I'm going to keep on looking into how long they are similar for... I'd imagine it has more to do with sensors that have similar functions, or it's a reference to something that has the same address in memory.

ok well i've compared the first 2 sections you've mentioned. They are both preceeded by 32 bytes of 255 (FF) the next 374 bytes have the same code. I'm not too sure what it does, I'd be curious as to what has the 2 same codes, unless it's a checker of sorts. guess i'll keep looking my self.


Now one thing i did kinda notice is from section 65F4 to 708A, i'm curious if that isnt' the fuel curve. I dont know much what these particular chips control, nor do i know how it address each of it's own pins, but if we can find a way to find how it differentiates between it's pins, or what address it's at, then this project would be a bunch easier cause then i could just search for that particular screen... deassembling is a very slow and hard process...never did like it much... what ever happened to the good olll.....new days of visual this and that!.... can you imagine a visual basic version of this chip...hmm me either.

Immeraufdemhund, if you wan to dissassemble the chip, you can try this program

http://www.pgmfi.org/twiki/bin/view/Library/PgmfiD51

This is a dissassembler program for the Intel 8051 chip.

If you guys want a ROM reader, I know of a few good ones but a basic ROM reader for the Honda ECUs would be the Willem Burner. You can get this one on Ebay or simply at www.mcumall.com

You can get the enhanced or dual power. I got the dual power and it does everything I need so far.

Now, for that PK2 Mugen ECU, the seller told me that it's a stock ECU shipped with the Mugen rom..... This rom sells for 10 bucks on Ebay and I'm not even sure it's a real Mugen ROM. Asking 200 bucks for this ECU should be considered as fraud IMO.

Wow great work guys!! Keep on it!

This is really exciting to see... keep up the good work!!

i finally got analyze.exe to open the bin but i have no idea what i'm looking at.:rolleyes:

what should i set the columns and precision at?
*edit* 15 and 1, yay.

Great job, carotman, and all of you guys. this is very exciting. I would, more than anything, like to make my pj0 let me hit closer to 8000rpm (at least 7400++), and you guys are on the road to unlocking that.

I've toyed with going obd1, and/or finding a real ph3 ECU, but this is what I think I would like to go for the best.

Wish I had any way of helping.. good luck

ok this is what i got out of the 4 pages.

The California Emissions kl pj0 fomr 88-89 made by denshigen (however its spelled) with OKI are the best bet for chipping. Every sensor you need is there, but a crank sensor, and there is even a wire for it, at pin b12, but it only functions as a ground.

basically you are very close, but hit a wall? keep up the good work, and let me know if i can help any. I just found out that my car is a Cali SE-i, just let me know.

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Originally Posted by carotman

Oh, you guys can work on this too huh!. Use the analyse.exe tool found on www.pgmfi.org

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Is that what it's called... where on PGMFI is it? I got to their home page then looked under software but only saw uberdata programs.
Do you have a direct link to the download?

here's the link to analyze.exe. it's at the bottom of the page.

http://www.pgmfi.org/twiki/bin/view/Library/NicoAnalyze

Is it supposed to be in a different language. :) oh well I think I figured it out.
Thanks for the link.

aqnalyse.exe basicaly helps you to find where the fuel tables might be. It can do nothing by itself unfortunately.

If the fuel tables setup can be worked out, we can modify them easily as needed.

hey carotman, do you know where the fuel tables are located in the pk2? if i could take a look at those i think i'd have a better idea of what to look for.