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Thread: CAN Mode 0x02 Freeze Frames

  1. #1
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    CAN Mode 0x02 Freeze Frames

    Greetings, I have a doubt with the mode 2 of the freeze frames. When I receive a package 7DF 8 02 02 00, where 02 is the number of bytes, 02 is the mode 2 and 00 pids supported in the response of the ECU 7E8 06 42 00 00 58 18 00 where 58 and 18 0101 1000 0001 1000 stating that supports the pids 2, 4, 5, C and D. But What does the previous 00 to 58 byte?
    Why is it used?

    Thanks!!!

  2. #2
    Constant Bitrate joeyoravec's Avatar
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    Quote Originally Posted by proyectanteATE View Post
    Greetings, I have a doubt with the mode 2 of the freeze frames.
    You should. Something's goofy here.

    Quote Originally Posted by proyectanteATE View Post
    When I receive a package 7DF 8 02 02 00, where 02 is the number of bytes, 02 is the mode 2 and 00 pids supported
    Consult SAE J1979 -- that doesn't look like a valid request. In my copy (Apr 2002) this would be Section 6.2.2.1 "Request Powertrain Freeze Frame Data Request Message Definition (Read Supported PIDs)". The request would have 3 bytes like:

    02: Request powertrain freeze frame data SID
    xx: PID Supported PIDs = {0x00, 0x20, 0x40 ....}
    yy: Frame #

    Your request with only 2 bytes seems too short to be valid.

    Quote Originally Posted by proyectanteATE View Post
    in the response of the ECU 7E8 06 42 00 00 58 18 00 where 58 and 18 0101 1000 0001 1000 stating that supports the pids 2, 4, 5, C and D. But What does the previous 00 to 58 byte? Why is it used?
    Again, this response looks short. In my copy Section 6.2.2.2 "Request Powertrain Freeze Frame Data Response Message Definition (Report Supported PIDs)" it would look like:

    42: Request powertrain freeze frame data response SID
    xx: Echo of the Supported PID
    yy: Frame #
    AA: Data A (see appendix A)
    BB: Data B (see appendix A)
    CC: Data C (see appendix A)
    DD: Data D (see appendix A)

    Since your request is too short, and your response is short, I don't think it's possible to interpret what you've provided as a SID 0x02 request or response on CAN.

  3. #3
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    Thanks you Joeyoravec for the info but my question is yy(Frame). What does the frame? What data must be put there?


    42: Request powertrain freeze frame data response SID
    xx: Echo of the Supported PID
    yy: Frame #
    AA: Data A (see appendix A)
    BB: Data B (see appendix A)
    CC: Data C (see appendix A)
    DD: Data D (see appendix A)

  4. #4
    VENDOR - ScanTool Vitaliy's Avatar
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    Quote Originally Posted by proyectanteATE View Post
    Thanks you Joeyoravec for the info but my question is yy(Frame). What does the frame? What data must be put there?


    42: Request powertrain freeze frame data response SID
    xx: Echo of the Supported PID
    yy: Frame #
    AA: Data A (see appendix A)
    BB: Data B (see appendix A)
    CC: Data C (see appendix A)
    DD: Data D (see appendix A)
    It's the frame number. For generic OBDII, it's always 00. Manufacturers can add additional frames (01, 02, 03, etc).

    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 Vitaliy!! It was what I wanted to know

  6. #6
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    Hi , I am beginner in DIagnsotic and want to understand concept of FReeze frame

    Quote Originally Posted by proyectanteATE View Post
    Thanks Vitaliy!! It was what I wanted to know

  7. #7
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    Hello ,

    Can any1 help me in understanding the concept of freeze frame .
    I mean what info it carries and in which format?
    What is the size of data it carries?

    Thanks
    Rounak

  8. #8
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    Freeze Frame information is extra information about for instance sensor values recorded along with a Diagnostic Trouble Code at the moment the DTC is set..
    The info varies per DTC and can even differ per engine.
    Size and format, read from the top or buy SAE J1979.

  9. #9
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    Quote Originally Posted by p2psmurf View Post
    Freeze Frame information is extra information about for instance sensor values recorded along with a Diagnostic Trouble Code at the moment the DTC is set..
    The info varies per DTC and can even differ per engine.
    Size and format, read from the top or buy SAE J1979.

    Thanks for your reply!
    Freeze FRame Data and Snapshot data , are these both same?
    And is this carried in the data field of CAN?
    In free any standard is not available for understanding of Freeze frame.

    Thanks
    ROunak

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