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OBD - Reading MG2 RPM

Discussion in 'Gen 3 Prius Technical Discussion' started by irrational, Dec 12, 2014.

  1. irrational

    irrational Member

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    I found the list of OBD commands that are floating around here, and I've been experimenting with my Prius. I was even able to disable the backup beep using a terminal app and the raw OBD commands :)

    So, next, I figured I'd try and read MG2's RPM. According to the spreadsheet I'm looking at, that's command "07E22162".

    When I type "7E22162" into my terminal app, the Prius response with "7F 7E 11", regardless of how fast I'm driving. So, I must be missing something, and wanted to stop by here and see if anyone else has had success trying this.
     
    #1 irrational, Dec 12, 2014
  2. irrational

    irrational Member

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    Screen Shot 2014-12-13 at 9.01.45 PM.png

    Starting to think this might have something to do with it.... the spreadsheet I'm referencing lists the same code for both MG2 RPM as it does for MG2 Temp.
     
    #2 irrational, Dec 13, 2014
  3. vincent1449p

    vincent1449p Active Member

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    The ELM327 can't understand what is the command 7E that is why it responded with 7F. The spreadsheet is meant for SGII and the ELM327 needs a different way of sending the command.

    If you know how to disable the reverse beep, the steps are similar, just change step 6:
    1. AT H1 (Headers on)
    2. AT L1 (Line feeds on)
    3. AT SP 6 (Set protocol to CAN 11bit/500kbps)
    4. AT DP (show you current protocol)
    5. AT CAF1 (enable auto formatting)
    6. AT SH 7E2 (directs your command to Power Management Control ECU)
    > 2162

    AT SH is for setting the Header. Every time you want to communicate with a different ECU, you have to set this first before sending your command.

    Vincent
     
    #3 vincent1449p, Dec 14, 2014
    irrational likes this.
  4. irrational

    irrational Member

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    Thanks!

    I do remember using AT SH when disabling the backup beep, and knew it was for setting the header... but, I guess I wasn't thinking when it came to this.

    I'll give that a try.

    Thank you very much!
     
    #4 irrational, Dec 14, 2014
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