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2017 Prime Plus, Preventive Maint.

Discussion in 'Prime Plug-in Charging' started by Andyprius1, Jun 15, 2019.

  1. Andyprius1

    Andyprius1 Senior Member

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    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Base
    Am considering looking at, measuring and cleaning and retightening to proper torque specs ALL HV battery connections. In the beginning I may only check a few of the connections. Knowing how serious even mild
    corrosion can affect all the series, parallel connections, even a consistent 1/10 of a volt variation could result
    in a lesser output after conducting thru 100-200 connections.
    I first purchased the Prime in 2016 and it’s daily readings after charging at home was ~ 35 mile range,
    now it’s only about 25 miles with only 31,000 miles on the car.
    I don’t believe this is normal. The reseating of any of the modules would also probably improve overall
    mpg readings, however there I foresee other problems cropping up in the present programming and I
    don’t want MAKE problems in that area.
    My question is: Has anybody attempted this type of early preventive battery check on any Prius ?

    Note: I did do a reboot on the 12Volt and produced dramatic and unexpected results on the Avg mpg readings. ( just did a new thread ). Avg. mpg readings should certainly affect range.
     
    #1 Andyprius1, Jun 15, 2019
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    It's quite an undertaking. They use an engine hoist to get it out, here:



    And here's the deep dive:

     
    #2 Mendel Leisk, Jun 15, 2019
  3. Andyprius1

    Andyprius1 Senior Member

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    I had not planned on removing anything thru hoist. One used to be able just take the top battery cover off and there were all the batteries! I have removed the cardboard covering and observed that HV battery access seemed to be the same. Did not remove Al cover, at that time.

    i had watched this before, and he is very good. I’m looking for a simpler access, equivalent to the 2005.
     
    #3 Andyprius1, Jun 15, 2019
    Last edited: Jun 15, 2019
    Mendel Leisk likes this.
  4. jb in NE

    jb in NE Senior Member

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    Is this the predicted range on the dash display, or the range you are actually achieving? Has your actual EV range (as measured with similar drives) also dropped by the same amount?

    What problems do you foresee, and why do you expect them?
     
    #4 jb in NE, Jun 15, 2019
  5. Andyprius1

    Andyprius1 Senior Member

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    Plug-in Base
    ??

    .none
     
    #5 Andyprius1, Jun 15, 2019
  6. Andyprius1

    Andyprius1 Senior Member

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    predicted is: what car reads, actual range is about 30 with careful driving
     
    #6 Andyprius1, Jun 15, 2019
  7. jb in NE

    jb in NE Senior Member

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    I have never put much credence in the predicted range. There seems to be an unfathomable algorithm behind that. I have been evaluating my EV capacity by actual range, not what the dashboard predicts.
     
    #7 jb in NE, Jun 15, 2019
  8. Raytheeagle

    Raytheeagle Senior Member

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    The only preventative maintenance I’d do on the Prime would be an early trans drain and fill along with an oil change before the 10 k mile change;).

    Just did those last weekend:):

    What did you do to your Prime today?

    But I’m at a lower mileage total at 4400 miles. I wouldn’t worry about the battery yet as you are still under warranty and only bad things can happen when opening the pack up prior to the warranty expiration (y).
     
    #8 Raytheeagle, Jun 15, 2019
    Mendel Leisk likes this.
  9. Tha_Ape

    Tha_Ape Active Member

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    Location:
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    Vehicle:
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    Model:
    Plug-in Advanced
    The guy to ask is HPrimeAdvanced. He uses EV mode almost exclusively.
     
    #9 Tha_Ape, Jun 15, 2019
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