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Thread: OBD2 LT1 XDF $EE EEX creation

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  1. #11
    Fuel Injected!
    Join Date
    Mar 2013
    Posts
    1,478
    We will separate the response in 2 parts. 1st ones are comming from the main comm loop, The second ones coming from the write,erase code.

    from write,erase code we have

    8085, there is error writing erasing the requested data.
    8086, success send next block on write
    8086, erase completed with success

    7678, erase progress message.

    From the main loop there is bunch more

    7441 submode out of range
    7443 upload size out of range
    7442 upload address out of range
    7444 mode34 success, upload enabled

    7677 block checksum not good, resend
    7678 upload good, will execute code now[for upload and execute]
    7673 upload good, send next block[for upload only]

    AAE0 on mode a0 request

    Some more hint on using IDA.

    You can open hex view and synchronize with ida view-a. You can edit the hex data in hex view. You can edit the input file and reload it in ida. It will take into account the mods. You can write code in hex in hex view and disassemble it and check for errors.
    You can copy hex data from hex view.

    Press space and it will switch the graph view. Extremely handy to trace code flow.

    The file that have no extension in the archive I have uploaded is the hex file being disassembled. That is the load file, You can modify it and reload in ida from file/load file/reload the input file/
    Last edited by kur4o; 05-10-2020 at 02:11 PM.

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