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Vehicle Diagnostic Report strange numbers

Discussion in 'Gen 2 Prius Technical Discussion' started by scottyd, Dec 7, 2009.

  1. scottyd

    scottyd New Member

    Joined:
    Apr 12, 2007
    7
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    Location:
    Corrales, New Mexico
    Vehicle:
    2004 Prius
    Model:
    N/A
    This last weekend I took my 2004 in for its first problem since buying it from a friend in 2005. The MFD was acting up, and it seems that the behavior is consistent with the known malfunctions as detailed in TSB EL002-05, so it looks like a new (reman) MFD is in the works if the connectors are OK....

    But, at the same time, he ran a "Vehicle Diagnostic Report" that listed about 80 apparently negative "events" that could occur, and the frequency of their occurrence. Most of them showed zero, but some are obviously incorrect. Here's a sample:

    Main Battery Low Voltage - Last Trip 254
    Coolant Heating - Last Trip 254
    Shift Without Depressing Brake - Last Trip 254
    Shift P in Running - Last Trip 254
    Accelerator & Brake Depress - Last Trip 254

    The guy tried to tell me that my driving habits were stressing the main battery. That may well be, but certainly not for the reasons shown. I cannot recall *ever* depressing the accelerator and brake simultaneously. Maybe once or twice I hit "P" while moving at <1MPH, but 254? Sometines I shift to "N" while moving, but not that often. And what's with this 254 number? Surely each of these independent events could not occur the exact same number of times?

    Anybody have an idea? Thanks....

    P.S. I bought a 2010 Prius V while I was waiting for the diagnosis.....
     
    #1 scottyd, Dec 7, 2009
  2. Politburo

    Politburo Active Member

    Joined:
    Feb 15, 2009
    971
    208
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    Vehicle:
    2009 Prius
    254 may be the limit of the recorder. If it's using a byte to hold values, it would range from 0-255. 255 may be used to represent an error. Who knows.. and actually I don't recall seeing anything previously about a "vehicle diagnostic report" that captures these kinds of events.

    Shift without depressing brake makes no sense. The computer won't even let you do that (due to federal regulations).
     
    #2 Politburo, Dec 7, 2009
  3. W3Bconsultor

    W3Bconsultor New Member

    Joined:
    Dec 3, 2009
    21
    3
    0
    Location:
    Redondo Beach
    Vehicle:
    2010 Prius
    Model:
    V
    Can it be that the 254 is a code which means 1?.
    It is odd as you describe it.
    What did Toyota said?
    W3Bconsultor
     
    #3 W3Bconsultor, Dec 7, 2009
  4. BAllanJ

    BAllanJ Active Member

    Joined:
    Dec 9, 2008
    667
    78
    0
    Location:
    Kingston Ontario
    Vehicle:
    2017 Prius
    Model:
    Two
    Except, of course, for shifting to neutral, which I do now and again so I can clean the brake discs; and shifting to B when coming down a long hill when your battery gets full...or, I think, shifting back to D after these events...
     
    #4 BAllanJ, Dec 7, 2009
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