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Ford J1850 PWM

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  • Ford J1850 PWM

    All,

    I am trying to build my own DTC reader, but I have problem with the J1850 PWM now.
    I sent command to my Ford Focus with 0x61 0x6A 0xF1 0x04 0x9F. and I got IFR 0x10 no problem, then I sent 0xF1, sometimes, I got the right response with 0x41 0x6B 0x10 0x44 0x53. But most of the time I got nothing or other response which first byte is 0x81...,

    Does anyone have the same experience? or tell what is wrong?

    Thanks in advance!

    Albert

  • #2
    Albert, out of curiosity, why don't you use an off-the-shelf IC that implements J1850 PWM, like an STN1110?
    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!

    You cannot send me a private message using this forum. Use my email instead: vitaliy[@]scantool.net.

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    • #3
      Vitaliy,

      I already implemented CAN and Kline by using STM8s, but PWM make me crazy. I think the problem may be from the pulse width is not accuracy. You know I don't like to use the exist IC.

      Thanks.

      Albert

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      • #4
        Anyone see my wheel?

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