2014 Camry won't turn on, check hybrid system

Discussion in 'Toyota Hybrids and EVs' started by Priusprofit, Dec 28, 2018.

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  1. Priusprofit

    Priusprofit Member

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    Hello PC,

    I'm having a very miserable night with my first hybrid camry repair (I'm a gen2 prius guy)

    Hopefully somebody can give me some insight as to what is causing this no start issue.

    Initial issue was the Check Hybrid System warning on the car, but the car still drove, the obd port was not functional so I was not able to scan it but the owner of the car says there was a p0a80 code when it did work.

    I removed hybrid battery and to my surprise modules tested between 7.94 and 8.21

    I assumed it was the variance in voltage that was the problem, I removed modules from existing battery and put them in another battery I had which made voltage between 8.03-8.16

    I installed that battery and the car would not turn on, sometimes ready would flash 2-3 times sometimes it wouldn't turn on at all.

    I checked all plugs and ground connections and couldn't find anything wrong.

    I swapped the junction box and the battery voltage sensor from the original battery thinking that could be the problem and the problem persists.

    Any suggestions as to what the problem/solution could be would be greatly appreciated.

    In the meantime I am putting modules back in the original battery but realistically what is there that wasnt put on the other battery? The temp sensor and voltage sensor harness?

    Posted via the PriusChat mobile app.
     
    #1 Priusprofit, Dec 28, 2018
  2. JC91006

    JC91006 Senior Member

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    Your orange interlock on the battery should be locked, flip up and slide down (in gen2, it's down) to lock it
     
    #2 JC91006, Dec 28, 2018
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  3. Priusprofit

    Priusprofit Member

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    Yes, that is inserted correctly.

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    #3 Priusprofit, Dec 29, 2018
  4. JC91006

    JC91006 Senior Member

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    Did you check your 12v voltage?
     
    #4 JC91006, Dec 29, 2018
  5. egn83b

    egn83b Junior Member

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    Most hybrid systems will not work tell you balance charge the battery pack. Meaning you need to put all the cells in parallel and charge em tell they are all 8 volts equal. Then and only then will the hybrid system accept and run the car correcly small variances are tolerable but anything a 20th of a volt is usually red flagged by the bms and the car will limp or may just sit idle.

    Posted via the PriusChat mobile app.
     
    #5 egn83b, Dec 29, 2018
  6. JC91006

    JC91006 Senior Member

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    Where did you get this info from?
     
    #6 JC91006, Dec 29, 2018
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  7. egn83b

    egn83b Junior Member

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    I learned from diy experiance and alot of forums online. Mostly on my honda ima cars and studying the mode of failure on the toyota hybrids when the bms flags the ecu of a battery issue. You need a scan tool to monitor the cells from the bms in the toyota. A torque app from the android play store and bluetooth adaptor obd adapter.

    Posted via the PriusChat mobile app.
     
    #7 egn83b, Dec 29, 2018
  8. Priusprofit

    Priusprofit Member

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    Upon arrival the modules ranged from 7.94-8.21 and the car was running and driving, they now range from 8.03-8.16 and the car does not ready on.

    Posted via the PriusChat mobile app.
     
    #8 Priusprofit, Dec 29, 2018
  9. Priusprofit

    Priusprofit Member

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    12.55

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    #9 Priusprofit, Dec 29, 2018
  10. egn83b

    egn83b Junior Member

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    The other thing you need to check is your battery contactor if its clicking when you press the on button.

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    #10 egn83b, Dec 29, 2018
  11. Priusprofit

    Priusprofit Member

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    It does click, that is in or near the junction box?

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    #11 Priusprofit, Dec 29, 2018
  12. JC91006

    JC91006 Senior Member

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    Have you grounded the battery case to the car? Put in the mounting bolts
     
    #12 JC91006, Dec 29, 2018
  13. Priusprofit

    Priusprofit Member

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    Yes

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    #13 Priusprofit, Dec 29, 2018
  14. JC91006

    JC91006 Senior Member

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    What's the voltage on the entire battery pack? I still think you don't have the orange interlock locked in place.
     
    #14 JC91006, Dec 29, 2018
  15. Priusprofit

    Priusprofit Member

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    Where do I get that voltage reading from? 2014 camry battery

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    #15 Priusprofit, Dec 29, 2018
  16. JC91006

    JC91006 Senior Member

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    This is how it's locked Screenshot_2017-12-02-07-25-14.jpeg
     
    #16 JC91006, Dec 29, 2018
  17. Priusprofit

    Priusprofit Member

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    #17 Priusprofit, Dec 29, 2018
  18. JC91006

    JC91006 Senior Member

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    You would have to trace your steps, check if all the bolts tighten, all the connections tight. No reason it won't start now, it's in the battery connections

    Try disconnecting the 12v negative and reset the car
     
    #18 JC91006, Dec 29, 2018
  19. egn83b

    egn83b Junior Member

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    Make sure to check all fuses and also do a reset of the small battery before and after all wiring changes so the ecu can reset and relearn. Best of luck on your car.

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    #19 egn83b, Dec 29, 2018
  20. Priusprofit

    Priusprofit Member

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    Removed and reinstalled battery twice checking everything, I was just able to catch the obd port working long enough to get codes and I have:

    P0b79 (hybrid battery voltage sense M circuit low)

    U029A (lost communication with hybrid battery pack sensor module)

    P0A80 (replace hybrid battery pack

    Posted via the PriusChat mobile app.
     
    #20 Priusprofit, Dec 29, 2018
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