Prius v Display Audio Service Menu w Battery Check

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by rjparker, Feb 3, 2015.

  1. rjparker

    rjparker Senior Member

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    I am suggesting that the original 2012 Prius v firmware did not operate that way. When the inverter’s power modules starting burning out, Toyota did a service campaign/recall to update the firmware to make the power igbts less prone to failure. Even then, many inverters have been changed under the extended “recalls”, but only after their failures stranded the owner. I had the firmware update followed a few months later by a failure.
     
    #21 rjparker, Jul 21, 2020
    Last edited: Jul 21, 2020
  2. Steve48

    Steve48 Junior Member

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    Interesting. Any idea what else was changed in the firmware update?
     
  3. rjparker

    rjparker Senior Member

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    Toyota just implied changes to improver reliability. It almost had to be software limits on maximum current and heat allowed through the inverter converter assy. They don’t release significant details of how their algorithms work.

    One of the better sources is a collaboration with Weber State’s automotive department WeberAuto on youtube. In general Toyota is better than their competitors when it comes to safety related issues like sudden failures that could strand you on a freeway overpass or the like.


     
  4. Steve48

    Steve48 Junior Member

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    Thanks. Great video.
     
  5. rjparker

    rjparker Senior Member

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    Useful Sequences

    Realtime 12v Battery Voltage in Off or Running State
    Check out your battery status/charging system by using the MFD Service Menu.

    1 Press the Start button without the brake pedal.
    2 Press and hold the "CAR" button on the MFD while turning the headlights on and off 4 times.
    3 Press "Function Check / Setting" field on the screen.
    -Function Check / Setting menu will appear.
    4 Press "Vehicle Signal" .
    -Vehicle Signal Check Mode" screen will appear, showing

    Battery 12.2v ---------SPEED 0 Km/h
    IG OFF ---------------TAIL OFF
    PKB ON --------------ADIM/TCAN BRIGHT
    REV OFF

    The 12v battery voltage is shown and changes as load changes. Go to Ready and the 12v will rise.

    Diagnosis Check MFD mode

    A Press Start button without brake.
    B Press and hold the "SETUP" button on the MFD while turning the headlights on and off 4 times.
    C The red "Diagnosis Check USA" screen will appear.

    Maintenance Mode to Continuously Idle Engine (Don't drive in this mode, damage may occur)
    Useful for coolant change when adding new 50/50 antifreeze

    1. Press Start button 2 times
    2. Press Gas Pedal 2 times
    3. Press brake and shift to Neutral
    4. Press Gas Pedal 2 times
    5. Press Brake and Press Park
    6. Press Gas Pedal 2 times (hybrid warning light will start flashing)
    7. Press Brake and Start button (starts engine, don't drive it, shutdown to return to normal)
    (Don't drive in the above mode, damage may occur)

    Invalid Mode
    for Brake Flush
    Useful to brake flush without Techstream Scanner
    1. Press Parking Brake
    2. Press Start Button twice
    3. Press Brake Pedal and shift into Neutral
    4. Press Brake x8 in 5 secs
    5. Press Park
    6. Press Brake x8 in 5 secs and release
    7. Press Brake pedal and shift to Neutral
    8. Press Brake x8 in 5 secs
    9. Press Park (Blinking brake light)
    10. You are in Invalid Mode
    Bleed rear brakes by holding pedal down
    Bleed front brakes by pumping brakes
    Power down to exit invalid mode

    Consider using charger on 12v battery During process
     
    #25 rjparker, Aug 8, 2020
    Last edited: Aug 8, 2020
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  6. Steve48

    Steve48 Junior Member

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    More great information; thanks.

    So now we know how to make a Prius idle continuously. On other cars, I wouldn't I wouldn't even think about it, but with a Prius I wonder where the energy goes. With the car in Park and the ICE running, electrical systems (AC, etc.) don't need all the energy generated, as discussed earlier. So once the HV battery is fully charged, where does the excess energy go? Will overheating become an issue?
     
  7. rjparker

    rjparker Senior Member

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    The electrical system acts the same way as it does normally while the vehicle is stopped except the engine does not shutoff. So in "Maintenance Mode"" the battery may initially charge for a few minutes and then it will stop charging. But the engine will remain running instead of shutting off. The hv battery will discharge as normal and the system will start charging again when its low. Continuous idle is not forced charging but its useful for running the engine when replacing the antifreeze to ensure bubbles are removed. You can't drive in this mode as damage to the transaxle could occur.

    Regarding "where does the excess energy go", the inverter determines the load on the MG1 motor/generator and can also turn it into the starter motor. So basically MG1 is not generating excess power although it may generate a small nominal amount. In this special maintenance mode, the engine is just rotating, except when the hv battery needs a little charge. You can actually hear the load of the engine change as the generator is enabled. Its similar to a normal vehicle's alternator, as amp demand increases actual engine hp load increases.

    A basic look at a Prius transaxle may help.


    Another decent video
     
    #27 rjparker, Aug 8, 2020
    Last edited: Aug 8, 2020
  8. Steve48

    Steve48 Junior Member

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    How slowly can the computer run the ICE? Is there a hard idle adjustment that sets the minimum throttle angle as with most engines, or can the computer decrease the idle until the engine actually stops?
     
  9. rjparker

    rjparker Senior Member

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    The engine has one warmed up idle speed controlled by the computer. I think we are still trying to understand how the computers can control the Motor Generator's output. A component is the transaxle's variable speed planetary gear set, perhaps best explained in the above videos. Another includes multiple 32 bit computing modules receiving inputs and executing outputs in a high speed networked operation. In this area Toyota keeps most details proprietary but the links below from an electrical engineering company gives a flavor to an amazing achievement in electrical power control and miniaturization within a mass produced vehicle.

    One link touches on computer controlled engines while the other explores computer controller electrical power systems as employed in hybrids.

    https://www.eetimes.com/special-issue-inside-the-prius-part-4-controllers-keep-dual-motors-humming/

    Special Issue: Inside the Toyota Prius: Part 5 – Inverter/converter is Prius’ power broker | EE Times

     
  10. Steve48

    Steve48 Junior Member

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    Interesting stuff in the articles. I knew that the MGs are 3 phase AC devices, but I didn't realize that they were also permanent magnet devices. I guess that eliminates brushes (?)
     
  11. rjparker

    rjparker Senior Member

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    Permanent magnets and no brushes makes them small, reliable and expensive up front.
     
  12. Sfpep

    Sfpep New Member

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    You can also force it to idle by just pressing gas on park so the engine starts and then switch it to neutral.. That way it wont charge the HV-battery so i recommend not to keep it too long on the neutral. But comes useful when its time for vehicle inspection and emission measurements.
     
  13. Steve48

    Steve48 Junior Member

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    Thanks. I didn't realize that idling in neutral doesn't charge the HV.
     
  14. Air_Boss

    Air_Boss Senior Member

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    That is why you hear "the HV discharged going through the carwash" complaints.
     
  15. Steve48

    Steve48 Junior Member

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    I hadn't heard that one. It's hard to imagine that the HV would discharge very much in the short time that it takes to run through a car wash.
     
  16. Air_Boss

    Air_Boss Senior Member

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    It's the queueing time, and leaving the lights on as they often do to signal some particular combination of services, that does it.
     
  17. rjparker

    rjparker Senior Member

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    Basically if its low when you give it to them, plus if its on its last leg most likely.
     
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  18. Air_Boss

    Air_Boss Senior Member

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    And... leaving the a/c on! Ask me how I know...
     
  19. Steve48

    Steve48 Junior Member

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    Amen.

    On the other hand, in these times of Covid-19, I often sit in the parking lot while my wife shops. If it's hot out- most of the time in Florida- I leave the car in ready mode with the AC on. It generally takes quite awhile before the HV gets down to the point that the computer fires up the ICE.
     
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