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Thread: Open source GM OBD2 flash tool using a ELM327 device

  1. #1
    EFI GearHead ! EagleMark's Avatar
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    Open source GM OBD2 flash tool using a ELM327 device

    http://pcmhacking.net/forums/viewtopic.php?f=4&t=1566

    Heres the HYPERTERMINAL setup, putty of course is the same. User beware this can be tricky also don’t bother messing with this unless you have your seed/key and are totally prepared to buy a new PCM. If your new to this I highly suggest you read ELM327DS

    Baud 38400
    parity none
    Data bits 8
    Stop Bits 1
    Flow control none

    Here’s the supposed procedure for a upload from the 411 PCM to a device (but it doesn’t work) any suggestions? Also not sure what PCMs this works on.

    AT RV — CHECK VOLTAGE (MAKE SURE ITS 12 VOLTS. MULTIMETER AND CAL. IF NEEDED)
    AT SP2 — SET ELM TO J1850
    AT H1 — SET HEADERS ON

    AT SH 6C FE F0 — SET HEADER
    3F — TEST DEVICE PRESENT RX(NO DATA) why no data?

    AT SH 6C F0 10 — SET HEADER TO
    27 01 — GET SEED RX(6C F0 10 67 01 66 7E 52) your seed will be different
    27 02 14 E7 — SEND CORRECT KEY RX(6C F0 10 67 02 34 4B) your key will be different

    AT SH 6C FE F0 — SET HEADER
    3F — TEST DEVICE PRESENT RX(NO DATA) why no data?

    AT SH 6C F0 10 — SET HEADER TO
    A1 — REQUEST HIGH SPEED MODE

    You only have a short time before it returns to normal speed automatically <5 sec.

    AT SH 6D 10 F1 –
    36 00 00 80 FF 80 00 — (eg. 128 bytes, start loc FF8000)

    after failure or success make sure to do this

    AT SH 6C F0 10 — SET HEADER TO
    A0 — RETURN TO NORMAL MODE
    AT D — RESETS ELM

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  2. #2
    EFI GearHead ! EagleMark's Avatar
    Join Date
    Feb 2011
    Location
    North Idaho
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    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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