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Please help: HV Battery or ECU?

Discussion in 'Gen 3 Prius Technical Discussion' started by Rodriguezintexas, Jun 15, 2017.

  1. Rodriguezintexas

    Rodriguezintexas New Member

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    Hello. Thank you in advance for your time and assistance. Please assume I know nothing when it comes to automotive and respond in layman's terms as much as possible. For affordability reasons I need to repair this myself, but I am learning as I go.

    2010 Prius
    157k miles

    Error codes:
    P0A80 (OBD2-permanent/Replace hybrid battery pack)
    P0A0D (Hybrid Engine/high voltage system interlock circuit high)
    C1259 (ABS/HV system regeneration malfunction)
    C1310 (ABS/malfunction in hv system)

    I have checked all 28 cells and they all measure between 7.2v-7.8v.
    I have removed all tarnish from the bus bar and it looks like new.

    Is there something else I need to do to check the HV battery? So far, it seems to be in good shape. Should I try replacing the ECU? Other thoughts or ideas?
     
    #1 Rodriguezintexas, Jun 15, 2017
  2. ericbecky

    ericbecky Hybrid Battery Hero

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    P0A0D (Hybrid Engine/high voltage system interlock circuit high)

    You have not properly inserted the orange service plug
    it's a three step process.
    insert
    swing up 90 degrees
    sling stringt down until it clicks.

    Rookie mistake. extremely common.
     
    #2 ericbecky, Jun 15, 2017
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  3. Mendel Leisk

    Mendel Leisk Senior Member

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    Just from what I've read here: isn't that way too much variation? (n)
     
    #3 Mendel Leisk, Jun 15, 2017
  4. ericbecky

    ericbecky Hybrid Battery Hero

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    Depends on how they got the readings.
    I assume the voltage readings were taken by hand.
    Easy to incorrectly read the voltages by that much.
     
    #4 ericbecky, Jun 15, 2017
  5. Rodriguezintexas

    Rodriguezintexas New Member

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    Thank you, Ericbecky. That did the trick for clearing everything bit P0A80!

    Actually, I cleared all the codes and disconnected the auxiliary battery to reset the computer. The car seems to run fine and the "check hybrid system" light went off. However, the code still appears after running the diagnostic.

    My thoughts:
    1. The code is labeled as *permanent* when it appears in the diagnostic. Is it possible we have solved the problem by cleaning the bus bars, but the code needs to be cleared a different way than through my simple diagnostic device?

    2. The code could be valid, but hasn't caused the warning light to appear on the dash, yet. The battery is fine, but the ECU needs to be replaced.

    3. I have checked the voltage of the cells and all read fine, but I haven't checked the amp hours, nor do I know how to do so. Could this be a problem?

    4. There is something else I am missing altogether.

    5. The battery just needs to be replaced.I can get my hands on a refurbished one oretty cheap, but the volts in the refurb don't read as high as mine, so I don't want to go this route unless I know for sure mine is shot.
     
    #5 Rodriguezintexas, Jun 15, 2017
  6. Rodriguezintexas

    Rodriguezintexas New Member

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    Yes, they were taken by hand, cell by cell, using a multimeter.
     
    #6 Rodriguezintexas, Jun 15, 2017
  7. Rodriguezintexas

    Rodriguezintexas New Member

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    Also, I have checked them the times, twice with the bus bar on and once with the bus bar off. It was pretty consistent every time.
     
    #7 Rodriguezintexas, Jun 15, 2017
  8. ericbecky

    ericbecky Hybrid Battery Hero

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    Did you always have the leads and battery terminal correspond?

    Positive lead to positive terminal.
    Negative lead to negative terminal.
     
    #8 ericbecky, Jun 15, 2017
  9. ericbecky

    ericbecky Hybrid Battery Hero

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    Also you need to watch the battery blocks live while under load.

    Perhaps there are issues there?

    What voltages is the car showing when under load. When charging car or discharging.

    Need and Elm 327 Bluetooth reader in conjuctionwith Torque app. Or some other tools to see data live.
     
    #9 ericbecky, Jun 15, 2017
  10. Rodriguezintexas

    Rodriguezintexas New Member

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    Yes, I was careful about that.
     
    #10 Rodriguezintexas, Jun 16, 2017
  11. Rodriguezintexas

    Rodriguezintexas New Member

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    Sorry, I misspoke. All the cells measure between 7.72 and 7.80.

    I don't know how to test it live, and as a novice, am pretty intimidated about the idea. What is the process using the device you mentioned?
     
    #11 Rodriguezintexas, Jun 16, 2017
  12. ericbecky

    ericbecky Hybrid Battery Hero

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    You actually don't need to "drive" per se.
    Basically "powerbrake" and watch the block voltages.

    Car on.
    Parking brake engaged.
    Foot on brake.
    Put car in drive, leaving foot on brake.
    Put other foot on accelerator to rev the car engine. This will fill up the battery.

    While this is going on see if there are any anomalies with cell block voltages.

    Use an elm 327 Bluetooth OBDII scanner in conjunction with the Torque Pro app and an Android device.

    Set Torque Pro up so you can watch block voltages.

    Feel free to call if you want to discuss on the phone. Sometimes it is easier than me typing out things.
     
    #12 ericbecky, Jun 16, 2017
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  13. Rodriguezintexas

    Rodriguezintexas New Member

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    The Elm 327 should arrive tomorrow. I will get back to both of you then. I cannot thank you enough for walking me through this.
     
    #13 Rodriguezintexas, Jun 16, 2017
  14. ericbecky

    ericbecky Hybrid Battery Hero

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    Please be careful when powerbraking. Be sure keep your foot on the brake.
    For extra safety you may want to park where there aren't any objects in front of you.

    You can download the Torque Pro app now and set up your custom screens before the elm device arrives.
     
    #14 ericbecky, Jun 16, 2017
  15. Former Member 68813

    Former Member 68813 Senior Member

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    Isn't the procedure for checking health under load by reversing again barrier/brakes?
     
    #15 Former Member 68813, Jun 17, 2017
  16. Rodriguezintexas

    Rodriguezintexas New Member

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    Here are my results.

    I should mention there is often a "stutter" upon take off. Screenshot_2017-06-19-11-05-35.jpeg Screenshot_2017-06-19-11-05-38.jpeg Screenshot_2017-06-19-11-06-03.jpeg Screenshot_2017-06-19-13-06-15.jpeg
     
    #16 Rodriguezintexas, Jun 20, 2017
  17. ericbecky

    ericbecky Hybrid Battery Hero

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    Looks like battery levels are not consistent.

    There is nearly a 1v difference between the highest and the lowest. The will not like that amount of variance.
     
    #17 ericbecky, Jun 21, 2017
  18. Jakemathews

    Jakemathews New Member

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    Did you find a solution to this yet
     
    #18 Jakemathews, Aug 25, 2019
  19. AsianDriver

    AsianDriver New Member

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    I got the same problem. Waiting to see what you come up with as to the solution. Thanks
     
    #19 AsianDriver, Sep 4, 2019
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