Engine not turning off at stop signs and signals

Discussion in 'Gen 3 Prius Main Forum' started by Kevin Henry, Jun 24, 2019.

  1. Kevin Henry

    Kevin Henry New Member

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    Prius not turning off at stop signs. I have a 2012 Toyota Prius, and I recently noticed something after I thought I had gotten bad gas but it is continuing off and on . I recently noticed that also that it was revving even after I had started going downhill and it would not go into EV Mode. And the engine was running and it was not charging the battery. And I pulled over to wait for the car to go into EV mode and it continues to run, I pulled up my screen and looked to see if it was charging my battery and it was not.I also have 138,000 miles on the car and it has been dealer serviced since now I am the second owner and I have been changing my oil every 5000 miles using the recommended oil for the car. This is my 12 Prius so I am very familiar having Prius . I have been doing a lot of research and I have noticed that a lot of older Prius is with more than 140,000 miles are needing a EGR cleaning or replacement, with this cause this issue to happen?
     
  2. Grit

    Grit Senior Member

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    How hot was the ambient temp when that happened? HV will not charge and discharge if the hv battery temp is passes a certain threshold. Happened to me before, just pull over and turn on the AC, hv fan will circulate cold air in the assembly then drive away when arrows points back to hv bat.
     
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  3. Kevin Henry

    Kevin Henry New Member

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    Well it was raining outside and probably in the low 70s.. Also I’ve noticed some blank minute increments on my screen showing my miles per gallon which I thought was strange even know I was driving, every so often there would be a blank minute, I have had no lights come on my dash whatsoever my car is running perfectly fine except for Engine revving after I’ve gotten over a hill it takes a wild for the engine speed to settle back down and normally it goes right into EV mode the minute you take your foot off the gas, this does not happen engine continues to run even though you’re going downhill and well under the 42 mph speed when the EV would work. Also have come up to a stop sign or signal and was waiting for the engine to turn off and go into EV mode and this does not happen. I was just wondering if this was caused because of a dirty or worn out EGR ?
     
  4. bisco

    bisco cookie crumbler

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    it is certainly worth cleaning the egr, regardless. if it doesn't help, maybe consider a prolong system
     
  5. mjoo

    mjoo Senior Member

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    Check your 12V battery

    Pixel XL ?
     
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  6. FuelMiser

    FuelMiser Senior Member

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    Maybe I missed it, but did you ever say what the State of Charge (SOC) on your Traction Battery when this occurs? If Traction Battery is full, it will not charge anymore, and it will rev the gas motor when coasting downhill and while stopped. All normal to prevent overcharging of the Traction Battery...
     
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  7. Kevin Henry

    Kevin Henry New Member

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    So my 12 V battery in the back of my vehicle could need replacing? And why would this affect my car this way? And why would my engine be racing after going down a hill and not going into EV mode?

    And yes I do know when the hybrid battery gets full, and you’re going downhill and you have it in the B mode, And yes the engine revs to disburse the energy that it cannot put back into the hybrid battery yes I am fully aware of that tendency of the Prius, but this is not the case. I have noticed that when I am going uphill of course it revs up to go over hills, but it takes a wild for the revs of the engine to settle back down and also it is not going into EV mode when this is happening it takes a long time for the engine to settle back down. Also it does not go into EV mode,At stop signs or signals.
     
    #7 Kevin Henry, Jun 25, 2019
    Last edited by a moderator: Jun 25, 2019
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  8. Mendel Leisk

    Mendel Leisk Sand Pounder

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    @Kevin Henry , you've probably still got a few hours where you can edit the thread title. Look for a button in the upper right corner of the intitial posting.
     
  9. Kevin Henry

    Kevin Henry New Member

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    I went back and checked, it is the original exhilarate battery, which means it’s seven years old now, how long did they last? Most cars that’s way too long but the dealer told me it’s a special kind of battery. But also my car almost has 140,000 miles so maybe it is time to replace that battery anyways?
     
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  10. Kevin Henry

    Kevin Henry New Member

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    Yes I tried to go back and edit it, it’s not allowing me to, maybe because I’m not a member yet, I’m having trouble with the initial code and the whole 15 minute thing. Sorry I’m a newbie
     
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  11. Mendel Leisk

    Mendel Leisk Sand Pounder

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    I'll ask moderator via report button.
     
  12. Kevin Henry

    Kevin Henry New Member

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    8FF1127C-B1A1-4230-A583-136A3156700F.jpeg 8FF1127C-B1A1-4230-A583-136A3156700F.jpeg 8FF1127C-B1A1-4230-A583-136A3156700F.jpeg
     

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  13. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Hybrid battery shows completely full, odd?
     
  14. Grit

    Grit Senior Member

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    I’ll take mjoo route next to troubleshoot. If your 12v can’t hold a steady charge anymore, ICE and hv battery will continuously charge it until it’s reaches it’s full mark.
     
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  15. mjoo

    mjoo Senior Member

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    It's a vented lead acid battery you can order at most auto part stores. They usually last 5-6 years.

    Pixel XL ?
     
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  16. Mendel Leisk

    Mendel Leisk Sand Pounder

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    Should be AGM type though. Most battery retailers will allow you to enter your car info and will come up with compatible battery.

    Some notes I've kept:

    ----
    OEM battery info (measurements taken directly):
    Battery id: S46B24R GS YUASA
    length: 9 3/8" (238 mm)
    width: 4 7/8" (124 mm)
    height: 8" (203 mm) (plus posts)
    post dia's:
    Pos: 13 mm (approx)
    Neg: 10 mm (approx
    Weight: 310
    ----
    Optima Yellow Top:
    Group Size: GR#51JIS: 46B24R
    CCA: 450
    CA: 575
    Length: 9.272 in
    Width: 5.024 in
    Height: 8.885 in
    web page:
    ----
    Canada Tire battery:
    MotoMaster Eliminator Ultra AGM
    Product Number: #010-5122-6
    Manufacturer's Product Number: ELU-S46B24R
    (rebadged Exide battery)
    ----
    Above Canadian Tire battery may be rebadged:
    Exide FP-AGM51JIS
    ----
    Bosch Premium Performance Battery Group Size 51
    Part # 51-440BAGM
    (Pep Boys has this?)
    ----
    ACDelco ACDB24R Advantage AGM Automotive BCI Group 51 Battery

    ----
     
  17. bisco

    bisco cookie crumbler

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    put a volt meter on the jump point after the car has been off a few hours
     
  18. Kevin Henry

    Kevin Henry New Member

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    Yes if you noticed on my dash my EV light is not illuminated, and you can clearly see by the gauge that I’m getting over 100 miles per gallon and it’s clearly in EV mode And my motor is not running.
     
  19. Kevin Henry

    Kevin Henry New Member

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    Thank you
     
  20. Kevin Henry

    Kevin Henry New Member

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    Thanks for your help, so appreciated.
     
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