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Odd battery readout

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by kiwisteve, Apr 28, 2018.

  1. kiwisteve

    kiwisteve Junior Member

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    Hi all,

    Got a 2006 Prius a few weeks ago. Has been driving fine, no errors and getting on average 5L/100km, so not too bad fuel economy. It has done 120k kms.

    Just got a Bluetooth obd2 attachment and been playing with a few apps. All seem to be showing module 2 as negative 16v and module 3 as positive 26v, all the other modules seem normal voltage.

    Anyone seen this before? Seems like maybe a sensor error to me?

    Thanks for your help.


    1524914546877.png

    Posted via the PriusChat mobile app.
     
    #1 kiwisteve, Apr 28, 2018
  2. ericbecky

    ericbecky Hybrid Battery Hero

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    Usually see it when there is a bad connection, sensor, or wiring. Did you or anyone else do some DIY repairs on the battery pack?
     
    #2 ericbecky, Apr 28, 2018
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  3. kiwisteve

    kiwisteve Junior Member

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    The guy I bought it off said he removed and cleaned all the connections, then put them all back. Said he did not remove the pack or any cells. Would you recommend opening it up and checking the connections?
     
    #3 kiwisteve, Apr 29, 2018
    Last edited by a moderator: Apr 30, 2018
  4. ericbecky

    ericbecky Hybrid Battery Hero

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    Definitely.
    Have your torque wrench at the ready and check all the nuts for the modules and HV connections.
    My guess is previous work was done with a "guess it seems tight enough" attitude.

    Also check the sensing wires for breaks.
    Check the orange connector and pins at the computer for corrosion.
    Clearly something is wrong.
     
    #4 ericbecky, Apr 30, 2018
    Last edited: Apr 30, 2018
  5. Erik Owens

    Erik Owens Member

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    Best advice get a real scan tool.
     
    #5 Erik Owens, Apr 30, 2018
  6. kiwisteve

    kiwisteve Junior Member

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    #6 kiwisteve, May 1, 2018
  7. kiwisteve

    kiwisteve Junior Member

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    Not sure if you guys place much trust in these Dr. Hybrid Tests?

    Posted via the PriusChat mobile app.
     
    #7 kiwisteve, May 1, 2018
  8. ericbecky

    ericbecky Hybrid Battery Hero

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    Maybe I should try it with a new battery and a failing one to see what it says. Or go to a dealership and test drive their car and see what it says. That might give you a baseline.
     
    #8 ericbecky, May 1, 2018
  9. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    + 1 to Eric's suggestions.

    The odd readings of one module showing negative and the next being double are usually short lived. A broken sensor wire should soon cause a P3030 code.

    Be careful when inspecting the voltage sensing wires. High voltage is present. Here is a thread covering fires at the voltage sensing harness.

    The battery fires at ECU sense connector thread | PriusChat

    Brad
     
    #9 strawbrad, May 3, 2018
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  10. VFerdman

    VFerdman Senior Member

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    If the car is not throwing codes I would question the PID formula on your app. Sometimes there are typos in the PID definition and the reading comes out wrong, though reality is fine. What app are you using?
     
    #10 VFerdman, May 3, 2018
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  11. kiwisteve

    kiwisteve Junior Member

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    Thanks for your comment. App is called Prius Dr. Car has done nearly 3000kms now, with no problems.

    Posted via the PriusChat mobile app.
     
    #11 kiwisteve, Jun 5, 2018
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