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    Mode $19 is "Read DTC Information", so it should...

    Mode $19 is "Read DTC Information", so it should return status of every specified DTC. I'm not sure exactly...

    I've made a huge progress last couple of days! E-side SPI comms are finally working...
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    For 1X fallback, you need to check for "break...

    For 1X fallback, you need to check for "break received" on the DLC, I've extracted it from 98 "black box" PCM code. Anyway, SPS code always goes back to 4X, but if you skip the 4X switch it will work...
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    Thank you very much! It is working now :)

    Thank you very much!

    It is working now :)
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    LT1 OBD2 Seed / Key algorithm

    Hello everyone!

    I'm writing a program to reflash OBD2 LT1 PCMs and I'm having trouble reverse engineering OBD2 LT1 PCM seed/key algorithm. OBD1 is simple, key is just one's complement od the seed....
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    Wow, I see I'm not the only one to reverse...

    Wow, I see I'm not the only one to reverse engineer OBD2 LT1 PCM :) Nice work, but it's a shame we are doubling up... I started working on this PCM over a year ago, now I have full E-side and partial...
  6. That's great! Are you using some kind of...

    That's great! Are you using some kind of compression in transmission?
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    Right, I removed all the breaks as I prefer...

    Right, I removed all the breaks as I prefer category view.



    Yes, increase that but also adjust the surrounding cells to smooth the table.
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    Not true, I'm using Dimented's flasher to tune...

    Not true, I'm using Dimented's flasher to tune cars on a regular basis and it works great. You can change OS without problems. There's one bug that prevents PCM to be reflashed again, but I have...
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    Right, the fueling can change due to humidity and...

    Right, the fueling can change due to humidity and temp, but I suspect you are hitting a weird transition on the VE table when this stumble occurs. Are your VE tables smooth? Try increasing the TPS AE...
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    I have checked the log, you are running a little...

    I have checked the log, you are running a little rich with BLMs around 120, and the moment you tap the throttle it gets momentarily lean from what I can see. Check your fuel pressure and have a look...
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    There you go, bin fresh from SPS reflash :)

    There you go, bin fresh from SPS reflash :)
  12. It's nice to see that you are progressing! I've...

    It's nice to see that you are progressing! I've been away for a while and didn't have time to participate, but I got some stuff cleared out of my way and I'd really like to take part in this and...
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    OK, I made some progress on this 96 dissassembly....

    OK, I made some progress on this 96 dissassembly.
    Reflash is done by OBD2 VPW protocol, ALDL line is mainly used for communication with Vette CCM, there are datalog messages, but very limited. Most...
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    Hi kur4o, can you export those databases to .i64...

    Hi kur4o, can you export those databases to .i64 format? My IDA doesn't like the .idb files :( Thanks!

    [EDIT]
    Nevermind, I managed to open those :)
  15. So I guess someone have done this software faster...

    So I guess someone have done this software faster than I could :) I'm in the middle of work to create my own OBD2 reflash tool, I've had good progress with cheap ELM327 compatible hardware, I see no...
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    I've found a little bug that causes the EEHack to...

    I've found a little bug that causes the EEHack to crash.

    When you go to any "user parameters" selection window, type a name that is not on the list and press ENTER, the program crashes. Not a big...
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    I'm using AVT-842 cable, but just for seraching...

    I'm using AVT-842 cable, but just for seraching PIDs any ELM327 interface is enough.
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    Glad I could help :) When you place data in...

    Glad I could help :)


    When you place data in program (flash) memory (PROGMEM attribute), you have to inform the code that tries to read it, that the data is in fact in flash, not in RAM. That's...
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    There you go, I tweaked the code a bit, but I...

    There you go, I tweaked the code a bit, but I don't have the arduino at hand to try and debug it, so no guarantees here.
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    I see your point with the DIY-friendly side of...

    I see your point with the DIY-friendly side of Arduino, and probably can agree. You are also right not to make this topic a discussion about pros and cons of different IDEs, so I won't. I just...
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    I'm using Excel 2010, don't know about the older...

    I'm using Excel 2010, don't know about the older ones, but all newer versions should work.
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    I've looked through your code, and I have a few...

    I've looked through your code, and I have a few suggestions.

    First of all, consider loosing Arduino IDE in favor of raw C code in Atmel Studio. I know that INO is easier at first, but has many...
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    From my experience, those are overpriced and not...

    From my experience, those are overpriced and not reliable, one leaked right out of the box, the other started losing pressure after a few weeks...
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    I've made a little spreadsheet to interpolate...

    I've made a little spreadsheet to interpolate between the injector data, it hurts me to read that you had to do it all manually ;)

    Fill the tables with data from LS calbration on LSx Data tab, and...
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    LT1 PCMs have separate Tach output, so don't...

    LT1 PCMs have separate Tach output, so don't worry about that function.
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