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Post Info TOPIC: Something different: Kokusan denki 2 stroke EFI ECU


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Something different: Kokusan denki 2 stroke EFI ECU


Hi Folks.

Since it's my first post in here, I will start with a very few words about myself.

I'm average Joe from Norway. I'm not into motorcycles at all, but I have done file writing in cars and trucks as a hobby for a few years. I've become confident with my hobby, so now I'm trying to expand my knowledge.

Just to say, am not close to the knowlegde you guys present in here. I would say years on the university before I would be close. But that is not a reason to give up, atleast not for me. So here I am, searching help from fellows that are willing to share a bit of their passion.

Just found this site some weeks ago searching the big space for information about my own little project.

So, my project is a Kokusan denki ECU, made for Arctic cat for use on their 800 2 cylinder 2 stroke EFI engines.

I have made steps, and put up my own goals. First step is to find a tool wich can read and write the ecu.

Step 2 is to eather manage to change parameters my self, or get help to change it. My prior interest is to be able to change ignition tables, but if I manage that, I should be able to do fueling aswell. I'm a bit unsecure if I'm aiming for the skys with this one, but if you don't have faiht and belive in your self, you are left at status que.

Back to the ecu.

I have cut it opend, soaked it in Aceton for a few days, and peeled out what I could of the silicon mass. I have found the processor, and here are the numbers on the processor:

64F2646FC20V

H8S/2646

RJ 0619

BD15443

My good fellow, google, tells me that this is the datasheet for the proz: http://documentation.renesas.com/doc/products/mpumcu/rej09b0257_2646hm.pdf

www.renesas.com

With my limited knowledge, it seems like there is a flash memory in the proz, which is a good start.

So, I also have manufactures wiring diagram, and it shows comunication ports with KWP 2000 protocol.

I know 100% sure that this ecu is possible to flash from the outside, since dealers are reflashing updates from manufacturer.

Attached is pictures of ecu, wiring, proz etc.

Is there anyone who know what tool would be able to read and write this ecu, I will higly appreciate a positive respond.

With regards from Norway:)



-- Edited by isanfa on Monday 4th of June 2012 08:50:12 PM

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So, 20 has been loocing, but no answears yet. Just have to have faith that the right one has not been in here yet.

Well, today I tried to power up the ECU according to the scheeme. Succed? I don't know, but there where noting that caught fire or smoking, so not bad eather.

Hmm, been reading as much as my stupid head can handle last days. Got smarter? Nah, don't think so. But, more I read, more I belive this should be possible, if someone would chime in with a good idea, everything is possible.

So what I'm thinking, need a tool that can ask the cpu for an answear. Humm, any ideas. Having a really smart collegue on visit next week. Have him study the manual.  But the tool used for reading the BUSA ecu, is that possible to adapt to use for my project?

Any insight?

Snaps from the CPU datasheet.



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You got enough snow up there yet?

Quick look in manual i think your ways in are: PBC, HCAN, SCI and K-Line (Artic Cat specific probably). Guessing CAN is not used either.
So start by identifying programming pins, (FWE, RX, TX) at least for serial. Trace them from processor and see where they are in main connector. 
Maybe MD pins for setting "modes" is needed, so look for them also. 

Also see attached image, is it a rogramming port? PBC Debugger? To small and bad quality to see.
If it is pads trace them to the processor and main connector also. 

Renesas FDT seems to work for this processor with FTDI-USB cable.
But read up on if there are any security before you connect, so its not auto-erase on connect like SH7052.
If i have not missed too much its seems to be pin and register settings... 

Can you upload good quality/resolution ECU pinout and Wiring diagram for snowmobile the ecu is from?
 



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here is a good copy of the wire diagram:

https://dl.dropbox.com/u/91506814/800%20wire%20diagram.pdf

I also have the dealer reflash harness it is pinned out:
6 white (jumper to pin 24)
7 red/blue
15 yellow
16 red/black
20 green
24 white (jumper to pin 6)
25 black

2strokeflashharness.jpg




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back TTT



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Does anyone have a sugestion on how to capture the file as it is being flashed to the ecu?

I have limited access to the dealer flash tool, but it is online based, and will only flash when there is an update for the specific VIN number of the machine, and only do it once per VIN.

I'm looking for ideas or methods to record or capture the file as it goes down the wire to the ecu, from the pc.

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Any one know how to re-flash these ECU's?



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Normally Kokusan ECUs are done through TTL level communication. Did you try to use a HTTP sniffer to get the data once it is been transferred to your PC?

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you can use a usb to TTL cable, but make sure to wire the CTS to RTS cables together, otherwise it won't work. The original cable from Kokusan uses a box to do the RS232 to TTL conversion. For flashing, you would need Renesas FDT

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Ahh, I gave up on this project on my own. It was way over my head I realized. I got to start reading the manual of the renesas processor, and stopped there:)
I should still have the ecu I made picture of lying around somewhere. Shall try to look for it again, now that there is some interest in the theme.



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Very interested in doing the same thing you want to do. I have a 2002 ECU mostly de-potted also. Last time i plugged it in it was still working. There is still no solutions available for these systems.



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Might help if we had some higher resolution pictures of the de-potted board and wiring diagram...



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I will post ut high res pics when I get home from work in couple weeks. I did not get to do it before I left.

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Here is what i have in my notes already. The wiring diagram leaves alot to be desired. I can take some better close ups of the ECU this evening. Looks like the pads next to the chip i took a picture of maybe of importance?

800 Wiring Diagram.jpg

 



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lancelarson156 wrote:

Here is what i have in my notes already. The wiring diagram leaves alot to be desired. I can take some better close ups of the ECU this evening. Looks like the pads next to the chip i took a picture of maybe of importance?

800 Wiring Diagram.jpg

 


 

This ecu is most likley not flashable, since it is that old. I would guess it is eprom based.  

 

 

 



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Twice wrote:

You got enough snow up there yet?

Quick look in manual i think your ways in are: PBC, HCAN, SCI and K-Line (Artic Cat specific probably). Guessing CAN is not used either.
So start by identifying programming pins, (FWE, RX, TX) at least for serial. Trace them from processor and see where they are in main connector. 
Maybe MD pins for setting "modes" is needed, so look for them also. 

Also see attached image, is it a rogramming port? PBC Debugger? To small and bad quality to see.
If it is pads trace them to the processor and main connector also. 

Renesas FDT seems to work for this processor with FTDI-USB cable.
But read up on if there are any security before you connect, so its not auto-erase on connect like SH7052.
If i have not missed too much its seems to be pin and register settings... 

Can you upload good quality/resolution ECU pinout and Wiring diagram for snowmobile the ecu is from?


 

 



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