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Thread: Multiple requests with ISO 9141 through ELM?

  1. #1
    Newbie preet's Avatar
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    Multiple requests with ISO 9141 through ELM?

    Hey,

    I was trying to see if I could request multiple pids at once in one request using ISO9141.

    request: 01 0D 0C 05
    response: NO DATA

    I don't know if this is protocol specific or vehicle specific. Testing was on a 2003 Honda Accord. Multi pid CAN requests (on another car) works fine. This site (http://www.drewtech.com/support/obd2/message.html) indicates that you can send 4000+ bytes with a single ISO9141 frame, though I'm not sure if this actually implies multiple requests are supported.

    Regards,

    -Preet
    Last edited by preet; 05-25-2011 at 06:51 PM.

  2. #2
    Low Bitrate remus08's Avatar
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    Hi preet,

    You said "Multi pid CAN requests", you're right!
    Multi-PID is only applicable for CAN bus based protocol. This is part of the OBD standard. ISO 9141 is a "serial" standard and by the way do not support this kind of request.

    ISO9141 can support lot of data but mode 1 allow you only one PID on ISO protocol.

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