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Traction Battery Computer Hack

Discussion in 'Gen 2 Prius Technical Discussion' started by Cory151, Apr 6, 2016.

  1. Cory151

    Cory151 Member

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    So Ive got one of my 2nd Gens that is throwing a P0A9C after cleaning up a corroded (Optima Yellow top negative -12 battery connection). Based off of the manual could I not cut splice the wires in exhibit B13 (see link) and insert a 50k Ohm resistor?

    http://ww2.justanswer.com/uploads/skyvisions/2008-06-21_094242_05_prius3.pdf

    I replace the 12 volt battery with a new one at the time of the found corrosion and I replaced the HV traction battery myself 7 months ago so I hate to get rid of a good battery.

    The car is a 2005 with 199k, since replacing the original traction battery with one from a low mileage wreck the car actually has gotten the best fuel economy since new. Seems pretty wasteful to replace the entire traction battery for one "renge/performance sensor."

    Thoughts?
     
    #1 Cory151, Apr 6, 2016
  2. dolj

    dolj Senior Member

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    Why would you need to replace the entire battery? If after performing the diagnostics as given in the service manual, and it does indeed indicate that the range/performance sensor is faulty, rather than replace the entire battery, why not just replace the faulty sensor? Do you not possibly have one in the battery you took out that might be fully functioning?

    I'm amused by people who think masking/eliminating the symptom is fixing the problem.
     
    #2 dolj, Apr 6, 2016
  3. S Keith

    S Keith Senior Member

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    Because the corrective action for a failed sensor is to replace the hybrid battery assembly per the Toyota Repair Manual that he linked. The sensor is not available.
     
    #3 S Keith, Apr 6, 2016
  4. dolj

    dolj Senior Member

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    Yes, I see that now, Toyota obviously don't want their technicians to disassemble HV batteries.

    However, it would possible to replace if he had a working one, correct, as per your option #3?
     
    #4 dolj, Apr 6, 2016
    Last edited: Apr 6, 2016
  5. S Keith

    S Keith Senior Member

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    #5 S Keith, Apr 6, 2016
  6. Cory151

    Cory151 Member

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    Im amused by people who put there foot in their mouth so readily.
    Not much of a reader when it comes to manuals are we? :LOL:

    Thanks for the
    Thanks for the hint S Keith. Are you looking to part with that sensor harness? Im in the market. :whistle:
     
    #6 Cory151, Apr 7, 2016
    Last edited by a moderator: Apr 7, 2016
  7. dolj

    dolj Senior Member

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    Yeah, you got me, right there on the last sentence on the last page.

    I still don't think the answer is trying to band aid around the bad sensor. If you have the skills to do that you can just replace it.
     
    #7 dolj, Apr 7, 2016
  8. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    I'll bet on #2A.

    Make sure the temp sensor's are securely clipped to the bottom of the battery. Ask me how I know.:cautious:

    Brad
     
    #8 strawbrad, Apr 7, 2016
  9. S Keith

    S Keith Senior Member

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    It is an option. I would prefer you investigate the connection and clips as Brad recommended before letting it go... :)
     
    #9 S Keith, Apr 7, 2016
  10. Cory151

    Cory151 Member

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    Ok, so the battery has to come back out to check and make sure they are connected on the bottom, correct?
     
    #10 Cory151, Apr 7, 2016
  11. strawbrad

    strawbrad http://minnesotahybridbatteries.com

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    You can see them though the lower air vent. You might be able to see in there with a mirror with the battery in place. Or remove the battery so you can get a better look. If your really lucky it will be the one on the end which you can reach with out taking the whole battery apart. (y)

    Brad
     
    #11 strawbrad, Apr 7, 2016
  12. Cory151

    Cory151 Member

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    Well I pulled everything apart including checking the 12v bat and cleaning all terminals. I was able to shine a light down the passengers side of the traction battery and the sensor harness looked good to me. I also unplugged/ plugged in, the harness mentioned in the service manual I linked above.

    Immediately took the car on a round trip from San Diego to LAX and back (250 mile trip) at about 75-85 mph the entire way and could not get the code to come back.
     
    #12 Cory151, Apr 11, 2016
  13. S Keith

    S Keith Senior Member

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    Good deal! I'd like to think it was the connector disconnect/reconnect...
     
    #13 S Keith, Apr 11, 2016
  14. Cory151

    Cory151 Member

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    Yeah so far so good, thanks for the input. Cant seem to figure out how that happens as the traction battery has not been touched in nearly 8 months?
     
    #14 Cory151, Apr 12, 2016
  15. S Keith

    S Keith Senior Member

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    Heat cycles, vibration and oxidation.
     
    #15 S Keith, Apr 12, 2016
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