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Thread: Does anyone know what is OBD II protocol for 2010's hondas

  1. #1
    Newbie Saran_yim's Avatar
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    Question Does anyone know what is OBD II protocol for 2010's hondas

    I've search in internet and found that Honda use CAN with 29 bit ID
    I try to send 0x18DA11F1 02 01 00 55 55 55 55 55 but have no answer from ECU

    But when I set my CAN MCU to just monitor I see some communication on the bus which has 11 bit ID mode

    and I found that on the OBD connector has cable go to pin number 7 as show in spec it is ISO K line
    I use digital multi-meter measure on that pin and got 7.x volt but it should be 12 volt

    So I try on ISO with 5 baud and FAST init and not success to communicate with ECU

    Any suggestion?

  2. #2
    Variable Bitrate
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    Required by law (both OBD2 in the USA and EOBD in Europe) it must be can (from 2008 on).
    So, what happens if you try 11-bit can?

  3. #3
    Newbie Saran_yim's Avatar
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    I try 0x7Ex for 11 bit can there are also no answer any idea?

    I also try 250k and 500k baud rate but still no success

  4. #4
    Variable Bitrate
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    What happens if you try the functional address (0x7DF) in stead of the physical address?

    I just saw you live in Thailand. I don't know if your country requires OBD2 (or JOBD) to be present on the car.
    When not, it is entirely possible that the car will not support OBD2.

  5. #5
    Newbie Saran_yim's Avatar
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    I did not try 0x7DF yet but I will try that.

    We don't have regulation to force to car manufacture to strick to any standard but for sure that since 2000+ all new car equipped with OBDII

    I will comeback with the result.

  6. #6
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    If you have the chance, try an ELM-327 scantool. It will automatically detect the protocol, and you don't have to be concerned with the details at the vehicle end. You simply send standard OBD2 commands (mode1,2,3, etc) via a comm port on a PC or any RS-232 device. I got a generic ELM327 usb scantool from Ebay for about $20. It works on Honda 2007 (ISO) and Honda 2010 (CAN). Hope this helps.

  7. #7
    Newbie Saran_yim's Avatar
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    Smile

    Hi, I just bougth ELM327 for testing and it working perfect and I found that it is a bug from ST micro who's produce MCU that I use in this project, Thank you for help

  8. #8
    Low Bitrate sinclairvital's Avatar
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    Functional address needed

    Quote Originally Posted by Saran_yim View Post
    I've search in internet and found that Honda use CAN with 29 bit ID
    I try to send 0x18DA11F1 02 01 00 55 55 55 55 55 but have no answer from ECU

    But when I set my CAN MCU to just monitor I see some communication on the bus which has 11 bit ID mode

    and I found that on the OBD connector has cable go to pin number 7 as show in spec it is ISO K line
    I use digital multi-meter measure on that pin and got 7.x volt but it should be 12 volt

    So I try on ISO with 5 baud and FAST init and not success to communicate with ECU

    Any suggestion?
    Should have used 0x18 DB 11 F1 02 01 00 55 55 55 55 55

  9. #9
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    Quote Originally Posted by Saran_yim View Post
    I've search in internet and found that Honda use CAN with 29 bit ID
    I try to send 0x18DA11F1 02 01 00 55 55 55 55 55 but have no answer from ECU

    But when I set my CAN MCU to just monitor I see some communication on the bus which has 11 bit ID mode

    and I found that on the OBD connector has cable go to pin number 7 as show in spec it is ISO K line
    I use digital multi-meter measure on that pin and got 7.x volt but it should be 12 volt

    So I try on ISO with 5 baud and FAST init and not success to communicate with ECU

    Any suggestion?

    Hi , if your vehicle supports 29bit CAN eobd , you must send 0x18DB33F1 as CAN address (try both baudrates 250K , 500K)
    Also try to to send 0x18DB33F1 02 01 00 00 00 00 00 00 (fill the bytes with 00 , not with 55)

    You will receive a reply from :
    0x18DAF110 Engine
    AND
    0x18DAF118 Transmission if the car is A/T

  10. #10
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    Quote Originally Posted by Hercules View Post
    Hi , if your vehicle supports 29bit CAN eobd , you must send 0x18DB33F1 as CAN address (try both baudrates 250K , 500K)
    Also try to to send 0x18DB33F1 02 01 00 00 00 00 00 00 (fill the bytes with 00 , not with 55)

    You will receive a reply from :
    0x18DAF110 Engine
    AND
    0x18DAF118 Transmission if the car is A/T

    Hi, Hercules
    I have tested our OBDII equipment on Honda Insight hybrid 2012 (CAN 29/500) and got non-standard address in answer: 0x18DAF10e (Engine???), 0x18DAF103 and 0x18DAF104.
    As the result my FW that wait for 0x18DAF110,0x18DAF118 (Transmission) and 0x18DAF128 (ABS??) does not work.
    Do you now why Insight answers have othe address? Where can I find the list of possible addresses for different car manufacturers.
    Thanks in advance
    Alex

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