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Charging issue

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Leksvndr, Jan 7, 2020.

  1. Leksvndr

    Leksvndr Junior Member

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    Hello everyone!
    sometimes a strange problem appears. for the first time this happened in the mountains, there was a long descent and the battery was fully charged, then engine braking was turned on.
    when the descent was over, engine braking continued even at the slightest descent, as if some protection had been turned on from recharging the batteries and the battery was completely discharged. Further, for some time the battery did not charge at all.
    the engine was just turned on for 20 minutes and there was no charge. After some time, the battery was charged and everything worked fine.
     
    #1 Leksvndr, Jan 7, 2020
  2. Leksvndr

    Leksvndr Junior Member

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    Here are the indications given by dr.prius
     

    Attached Files:

    #2 Leksvndr, Jan 7, 2020
  3. jerrymildred

    jerrymildred Senior Member

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    Hot battery/full battery. Either will cause the system to use engine braking to protect the battery. Happens on long, steep downgrades with lots of regeneration.
     
    #3 jerrymildred, Jan 7, 2020
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  4. Leksvndr

    Leksvndr Junior Member

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    yes, but why then does the battery run down? the temperature was already normal at that time.
     
    #4 Leksvndr, Jan 7, 2020
  5. bisco

    bisco cookie crumbler

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    if it happens aside from long descents, i would have it looked at. otherwise, chalk it up to heat and battery protection
     
    #5 bisco, Jan 7, 2020
  6. jerrymildred

    jerrymildred Senior Member

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    You posted your pictures while I was typing. I'm not a Carista expert, but some of those pictures look to me like you're getting really close to needing a new traction battery. Or else there's a bad connection in the sensor wiring. Unless you're over 150,000 miles, it's still under warranty. I'd ask the dealer.
     
    #6 jerrymildred, Jan 7, 2020
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  7. alanclarkeau

    alanclarkeau Senior Member

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    It's just the way it works - it's protection for the battery, and possibly the inverter. Mine does it from time to time.

    There is one location I drive every Friday where it uses EV much of the time and gets down to 2 or 3 bars, then charges to 7 again, then similarly in EV, charges again - at which point it won't go into EV till it's cooled down. I turn off ECO Climate to get more cool air into the back floor area when that happens - sometimes, most times, I just let it do it's thing, it'll get over it.

    It also does it on a downhill mountain pass where it charges quickly. It makes none/very little difference to my l/100km.
     
    #7 alanclarkeau, Jan 7, 2020
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  8. bisco

    bisco cookie crumbler

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    how many miles in her?
     
    #8 bisco, Jan 7, 2020
  9. Leksvndr

    Leksvndr Junior Member

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    118k now
     
    #9 Leksvndr, Jan 7, 2020
  10. kithmo

    kithmo Couch Potato

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    When you say engine braking was turned on, was the shift indicator showing "B" on the MFD or was it showing "D".
    What I would try in the situation you were in is, if it is showing "B", shift to "D", if it was showing "D" shift to "B" then back to "D" and see if that starts up the charging process.
    Of course if none of that makes any difference then it's probably the battery protection system doing its thing.
     
    #10 kithmo, Jan 8, 2020
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