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EV mode oddities

Discussion in 'Newbie Forum' started by Canuck249, Mar 26, 2019.

  1. Canuck249

    Canuck249 New Member

    Joined:
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    Vehicle:
    2018 Prius Prime
    Model:
    Plug-in Base


    I have had a Prime for 1 month now and like it alot. However, I get confused with the EV mode in the Prius. I have noticed 2 things :

    1) When I turn on the Front Window defrost, the engine comes on? I get that it may just be to save the battery, but can't find anywhere that states this as expected behavior.

    2) Once I am driving in HV mode, if I hit the EV button, the car takes quite a long time to switch over. Sometimes it takes so long that I actually restart the car and it drops back to EV mode.

    Are these normal?

    Thanks
    M
     
    #1 Canuck249, Mar 26, 2019
  2. Tideland Prius

    Tideland Prius Moderator of the North
    Staff Member

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    #1 is in the manual. That’s normal.

    9776DE96-8B3C-47D2-A5BC-ECFA1D3062D6.jpeg


    #2. If you recently switched over or the engine is cold, the engine will run until it surpasses a minimum temperature threshold to reduce emissions before it shuts off. (E.g. you press front defrost and then realise you don’t need it 10 secs later, the engine will complete its warmup cycle before shutting off.
     
    #2 Tideland Prius, Mar 26, 2019
    jerrymildred and Skibob like this.
  3. bisco

    bisco cookie crumbler

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    1) this is a lawyer safety device, so one can't claim they couldn't see the semi coming due to poor defrost method

    2) haven't heard this before. pip switches immediately
     
    #3 bisco, Mar 26, 2019
  4. Canuck249

    Canuck249 New Member

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    Plug-in Base
    Great - Wow - thanks for the answers. Makes total sense.

    Mystery solved.

    Next one - i need to understand all the icons and the ratings it keeps giving me. I've not searched this form yet for that, but I will!

    Matt
     
    #4 Canuck249, Mar 27, 2019
    Salamander_King and bisco like this.
  5. bisco

    bisco cookie crumbler

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    and your owners manual (y)
     
    #5 bisco, Mar 28, 2019
    Skibob and Salamander_King like this.
  6. Mendel Leisk

    Mendel Leisk Senior Member

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    I find with our 2010 regular Prius, if I'm stopped at a red light, with partially warmed-up engine, I can reliably get the engine to turn on/off, by raising/lowering the cabin temperature setting. The car is monitoring your "comfort" demands, and changing behavior accordingly.
     
    #6 Mendel Leisk, Mar 28, 2019
  7. Salamander_King

    Salamander_King Senior Member

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    Glad you found answers. The manual is the best ref for most questions you have. As for "the rating", if you are talking about Eco score, if you start the car and drive, you will get less than 97 on Eco score. I have never achieved elusive 100/100 shown in the manual to date. :oops: I sometimes get below 40 when I had to do sudden stop to avoid an accident. Yeah, I'd rather fail that Eco score than hitting something.

    ecoscore.png
     
    #7 Salamander_King, Mar 28, 2019
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