Wgat is going on here????

Discussion in 'Gen 2 Prius Technical Discussion' started by BillMelder, Feb 21, 2025 at 7:16 PM.

  1. BillMelder

    BillMelder Junior Member

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    Let me be clear... i have no triangle of death. no codes are being thrown. car drives just fine. But these readings from Dr. Prius have me concerned. Any thoughts? Replaced ECU inside the hyburd battery because i thought it might have corrosion on the pins. Readings remained the same.

    200k
    2009 Prius
    no problems with car whatsoever but readings all of the sudden have become strange and worry me
     

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  2. Hayslayer

    Hayslayer Junior Member

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    Why would those readings be of any concern? They're not even possible. Believe your car, not the app.
     
  3. BillMelder

    BillMelder Junior Member

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    what do you think would be causing the torque app and dr prius to give results like that? before the results have been normal. out of nowhere im getting these readings.

    any advice is appreciated.
     
  4. dolj

    dolj Senior Member

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    Normally, when you see weird voltage readings like that, the No. 2 wire harness is compromised by corrosion with breaks in one or more of the sense wires.

    In this case, though, you would have the MWL and possibly others on the dash, along with codes to read.

    The Torque and the Dr. Prius apps have their uses but cannot be relied on for scanning for codes. You need a better scanner. You can find a review of several here.

    Lastly, is your dash lighting up 100% reliably?
     
  5. PriusCamper

    PriusCamper Senior Member

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    Lol... There's nothing wrong with the app's ability to read data.

    This is caused by a known problem: Corrosion in the Battery ECU & Voltage Sensing Harness.

    It can often be fixed by doing nothing more than cleaning off all the corrosion. But while you're in there, its a good opportunity upgrade with better bus bars, nuts and wiring: Hybrid Battery Bus Bars | ACENBAY, LLC
     
  6. Hayslayer

    Hayslayer Junior Member

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    hmmm..he installed a replacement ecu
    temperatures are afu
    voltages are afu

    you think it's corrosion on the harness?

    never seen a voltage sensor harness create temperature indication problems. like -400f and +400f

    yet there are no codes or warning lights
     
  7. Brian1954

    Brian1954 Senior Member

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    My guess is a problem with the connection between the Bluetooth dongle and the OBD2 port OR The Bluetooth dongle developed a problem. Do you have a different Bluetooth dongle that you can try?
     
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  8. Tombukt2

    Tombukt2 Senior Member

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    Replacement battery ECU means that it's probably just like the one you took off the car someone needs to open the silver back cover and look at the bars going from the board to the receptacle It's just that simple and then while you have this out you've got the whole battery cover off you might as well clean the mess up.
     
  9. ChapmanF

    ChapmanF Senior Member

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    nope, wouldn't expect that to be the voltage sensor harness. maybe the temperature sensor harness though.