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Thread: '06 Ford Focus CAN Data Errors on ELM327 1.2a

  1. #1
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    '06 Ford Focus CAN Data Errors on ELM327 1.2a

    I'm getting "DATA ERROR" while listing all received CAN Traffic on my '06 Focus using a (probably generic knock-off?) ELM327 1.2a. Is my ELM so out of date that it's not understanding the data from these certain modules on the network? This is after changing my baud-rate to 115200, so the buffer didn't fill up quite so quickly, turning on headers, and running the AT MA command.

    231 00 <DATA ERROR
    3E9 00 <DATA ERROR
    4B0 27 10 27 10 27 10 27 10
    200 27 61 26 F7 27 60 80 00
    205 00 <DATA ERROR
    231 00 <DATA ERROR
    250 00 <DATA ERROR
    4B0 27 10 27 10 27 10 27 10
    200 27 61 26 F7 27 60 80 00
    205 00 <DATA ERROR
    231 00 <DATA ERROR
    3E9 00 <DATA ERROR
    200 27 61 26 F7 27 60 80 00
    205 00 <DATA ERROR
    231 00 <DATA ERROR
    433 00 <DATA ERROR
    4B0 27 10 27 10 27 10 27 10
    200 27 61 26 F7 27 60 80 00
    205 00 <DATA ERROR
    231 00 <DATA ERROR

    4B0 & 200 are the only two modules I can ever seem to get any data from. Can someone shed some light on my obvious misunderstanding about how this is supposed to work?

    Also, anyone know any sources for on-going reverse engineering of CAN data from these vehicles? I'm just getting into it, wondering if there was any place besides the bottom to start from.

    Thanks!
    Dave

  2. #2
    VENDOR - ScanTool Vitaliy's Avatar
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    ELM327 expects the DCL to always equal 8, hence the error. Newer versions (IIRC, v1.3 and above) don't have this problem.
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  3. #3
    Low Bitrate remus08's Avatar
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    Hi,

    I do the same experiment than dmcglynn and I've got some "Data error" (with a 1.4 version)

    Code:
    201 11 B9 7B 58 27 10 00 7D
    230 00 01 66 00 64 00 0F 80
    360 00 00 00 00 00 00 00 99
    080 27 10 75 30 01 30 24
    090 47 08 57 08 07 F7 17 D0 <DATA ERROR
    210 FF FE 3C A4 40 00 24 <DATA ERROR
    ELM327 datasheet talk about CAN auto formating with expect ISO 15765 CAN message, but I'm sure to understand.

    Somebody has an idea? Thanks

  4. #4
    VENDOR - ScanTool Vitaliy's Avatar
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    Can you guys turn on display of the DLC? "AT D1"

    remus08, I think your problem may be unrelated. Notice how dcmglynn's <DATA ERRORs follow only the short frames. <DATA ERROR in that position may point to an actual CRC mismatch.

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
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  5. #5
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    Thanks for the response.

    DLC commands, both "AT D1" & "AT V1" are apparently unsupported on the version 1.2a ELM327 that I have. Both just return the familiar "shoulder-shrug" response of "?".

    Thanks for the info though.

    Dave

  6. #6
    Low Bitrate remus08's Avatar
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    Right my problem is not the same. I didn't notice that actually I use my interface @230400 baud and it's a 1.3a version.

    I will try to enable DLC, disable CAN auto formatting and make another measurment

  7. #7
    Low Bitrate remus08's Avatar
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    Hi,

    Ok, I've done the test again
    This time, I've disabled CAN automatic formatting (command AT CAF) and enable DLC option

    Code:
    362.319922 > ATCAF0
    362.340576 < OK
    362.340611 < 
    362.340634 < >
    371.825821 > ATD1
    371.857177 < OK
    371.857211 < 
    371.857233 < >
    394.824137 > ATMA
    395.109342 < 43078A005746800000
    395.110296 < 200701E701E801E810
    395.110475 < 20181BA87DC53D74007C
    395.110651 < 23080500570064000080
    395.111521 < 3608000000000008002F
    395.113160 < 0807266B74BC0133AC
    395.113340 < 0908C6CFD6E907451795
    395.113504 < 2107FFFE3CA44000AC
    395.114220 < 4B083D893D603D7D3D4E
    395.114386 < 200701E801E801E810
    395.114565 < 23080500570064000080
    395.115299 < 3608000000000008002F
    As you can see, everything woks well, so think to disable CAF option

    PS: Now, I'm looking for to understand the data, if someone has some clue, that would be great!!

  8. #8
    VENDOR - ScanTool Vitaliy's Avatar
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    No clue, except that the first three nibbles are the 11-bit CAN ID, and the fourth nibble is the DLC.

    I would approach the problem thus:

    1. Make a list of all IDs that you see.
    2. Set up the filters to receive one ID at a time.
    3. Tweak things (open/close doors, turn switches on/off, vary RPM, etc), and see if the data changes.

    Best regards,

    Vitaliy
    OBDLink MX: world's smallest, fastest, most advanced OBD/Bluetooth adapter with SW and MS CAN support. Read the review to learn more.
    Need to look up a diagnostic trouble code? Try the most up-to-date, free DTCsearch.com!

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