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Thread: PFL 7201 ecu successfully read and flashed

  1. #1
    kinkyafro's Avatar

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    PFL 7201 ecu successfully read and flashed

    As per the subject having removed the eprom chip from a pfl ecu I've managed to read the data off it (see attached file) I've also sucessfully tested writing to another eprom...

    I've not really looked at the rom in detail yet as I only just removed it 15 mins ago but I think it follows the same format as others I've seen.

    Next step for me is to solder a socket onto the ECU I currently have in bits and see if it still works with the original map before applying a new map if I'm really lucky i may manage this over the weekend.

    can a ecu mapping expert give me a second opinion on the attached rom - is it the same format as the 7202 roms?

    assuming that it is has anyone got a good generic map (more boost please) for an unmodded VR4?

    Cheers
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    Was the ECU only flashable by removing the chip, or was it just easier that way? I suspect a few people might not be too keen to take a soldering iron to their ECU, and if it can be flashed without the chip being taken off the board, that would be great

    But definitely good news for us PFL owners have some rep!

  3. #3
    kinkyafro's Avatar

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    Quote Originally Posted by wintertidenz
    Was the ECU only flashable by removing the chip, or was it just easier that way? I suspect a few people might not be too keen to take a soldering iron to their ECU, and if it can be flashed without the chip being taken off the board, that would be great

    But definitely good news for us PFL owners have some rep!
    I aquired a spare before i did it and it is fair to say it's not something for the feint of heart - I just hope I didn't cook the ecu mainboard in the process of removing it as i have yet to check it still works.

    It probably is possible to do it without removal unfortunately the question of how hasn't been answered.

  4. #4
    scott.mohekey's Avatar

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    Great work! This will probably end up being a service that some of us can do for others, unless a solderless method can be found.

    REP!

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    Hope this all goes well, well done, does this mean it may be poss with evoscan cable??
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    Well, that's not a total loss, there's nothing stopping you making a "daughterboard" that you can adjust / reflash whenever you want (but I think I remember reading that the changes are only read once per start-up or power-up and then kept in RAM)
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    Quote Originally Posted by Louis
    Hope this all goes well, well done, does this mean it may be poss with evoscan cable??
    Nope, not yet. This is more physically desoldering the storage chip of the ECU, programming it in a dedicated programming device, and then resoldering it into the ECU.

    I hope one day it's just as simple as an OpenECU cable.

  8. #8
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    Quote Originally Posted by foxdie
    the changes are only read once per start-up or power-up and then kept in RAM)
    Ugh hope your wrong on that as I was planning to try switchable maps next and having to disconnect the battery every time you switch the map would be a bit rubbish.

  9. #9
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    Quote Originally Posted by kinkyafro
    Ugh hope your wrong on that as I was planning to try switchable maps next and having to disconnect the battery every time you switch the map would be a bit rubbish.
    If you're going to have switchable maps, you'll probably have a switch of some sort, and I would also think that switching maps while the engine is running is a no no. So why not wire it up so that when the engine is off, you switch maps and it also resets the ecu.

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    I will have a chat with you at the weekend Rich about some idea on how you can do this without de-soldering the chip

    But Mucho rep from me for doing this


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    Wonder if it is possible to pull the code within the actual processor and modify it so that switchable maps are possible?

    There could also be a routine in there that prevents any changes to a particular area of the EPROM, which is why EvoScan and ECUFlash don't work... guess the only way to really tell is to check out how the other ECU's have been flashed and what they did to allow writing to memory.

  12. #12
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    I'm sure I mentioned this in the other thread, but a daughter board with an inverted plcc socket on the bottom would do the trick. They used to do it in the Amiga days for various expansion options. I've attached two images showing what I mean. The first shows the daughter board installed, the second is a bit small, but shows the bottom of the daughter board.
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    This is similar to what the older evo and the DSM guys do. Desolder the main EPROM chip, put in a ZIF socket and burn new chips for the ecu, or use an emulator to do live mapping etc.

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    kinkyafro's Avatar

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    Quote Originally Posted by aboo
    Anymore news on this?
    Yeah it seems that the rom I pulled is not yet understood - there are definitely tables present but they need to have there location, size and purposes identified. I just posted on geekmapped to see if any of the ecu gurus there can make sense of it.

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    Have you managed to solder a socket on and put the ROM back in for testing the ECU yet?

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    Quote Originally Posted by wintertidenz
    Have you managed to solder a socket on and put the ROM back in for testing the ECU yet?
    Yep although I won't be testing it for a few weeks (no reason to rush as I don't have a modified rom to put on it).

  17. #17
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    You could always just modify a couple of null bits at the end and see if they write okay?

  18. #18
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    Hi There,
    i would have thought you would want to see if the fitting of the chip back in to the socket and removing of it casued any problems before you go modifiying the rom.
    get to a safe stable point where you can put a peg in the ground, in terms of design robustness. so you are confident you can pull the chip programe it and put it back in without worrying about the design falling apart. the last thing you would want is to do a load of testing, only to find out you have a intermitant dry solder joint some where thhat has bee screwing up your results and have to repeat everything again as no longer have reliable results.

    Bye for Now!

  19. #19
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    What is the part number of the ROM chip please? I am an electronics/software engineer.

  20. #20
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    It's an atmel device - it's mentioned earlier in this therad I think - or another thread on flashing. theres only 2 or 3 of them about.

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