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Thread: PWM on HONDA

  1. #1
    Newbie
    Join Date
    Nov 2008
    Posts
    1

    Post PWM on HONDA

    Hi, I need some help, I have to do a OBDII reader as a project in collegue and I found that the vehicule I could use for test (HONDA CRV) has the SaE-J1850 protocol PWM.
    So my teacher ask me if the OBDII conecctor really has a PWM? I mean, is it really a PWM or the frame has a static Width for each byte?
    I don't know how to measure (if I can), can i see it with a osciloscope?
    Can anyone please help me?
    Thanks

  2. #2
    VENDOR - OBDPros
    Join Date
    Mar 2006
    Posts
    359
    It would be helpful if you have access to the SAE J1850 spec in your school library, the Byte frame on J1850 PWM is a fixed width, the PWM part is due to the the widths of the pulse conveying the info...

    I would have thought that the Honda would be ISO rather than PWM though, are you sure its PWM?

    Paul
    www.obdpros.com

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