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Stamp to OBD II interface — Parallax Forums

Stamp to OBD II interface

m_fabio2m_fabio2 Posts: 49
edited 2007-02-17 22:12 in BASIC Stamp
I'm working on my vehicle interface system, and I want to connect the stamp to the on-board computer on my ford ranger. I would like to interpret the any error codes from the computer and display them on my LCD display. Maybe one day take the real time info from the computer and display, but just for now the error codes. I was just wondering if anyone had ever tried this with success.

Comments

  • Mike CookMike Cook Posts: 829
    edited 2004-11-10 12:07

    The easiest way to do this is to purchase a chip to convert the Ford's SCP BUS (PWM OBD-II BUS) to RS-232, take a look at http://www.elmelectronics.com/obdindex.html Also you will need to purchase the SAE specification J1979 to determine what codes to send to the PCM. Some free information can be found at www.scantool.net

  • Brian CarpenterBrian Carpenter Posts: 728
    edited 2007-02-17 21:46
    Mike, is it possible to read the odometer of the vehicle through the obd II interface?

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    It's Only A Stupid Question If You Have Not Googled It First!!
  • Mike CookMike Cook Posts: 829
    edited 2007-02-17 22:12

    Odometer value is not part of the SAE J1979 specification.

    However I think this should be available but it would be manufacture specific, which unfortunately most if not all manufactures will not publish their propriety code to get to this information.

    At least on FORDs and maybe other manufactures there is what is called a 'rolling count' transferred on the OBDII buss that synchronizes the instrument cluster and the ECM. This is something, I would like to experiment with, that's on my future to-do list. This is used so you can't just buy a new instrument cluster and 'roll back' your odometer.

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    Mike

    Post Edited (Mike Cook) : 2/17/2007 10:28:07 PM GMT
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