1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Weird ICE action while waiting at red light

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Former Member 68813, Jun 25, 2013.

  1. Former Member 68813

    Former Member 68813 Senior Member

    Joined:
    Oct 3, 2010
    3,524
    981
    8
    Location:
    US
    Vehicle:
    Other Hybrid
    Model:
    N/A
    The engine is fairly hot after driving 2 miles in hot weather. Waiting a minute or longer for green light. No A/C or fan. Battery is 3/4 full (judging by number of bars). Windows fully open to cool the cabin. My foot is on the brake. The ICE suddenly starts and turns off at the same time. I had the car for near 3 years and this is the first time.
    Comments?
     
    #1 Former Member 68813, Jun 25, 2013
  2. rdgrimes

    rdgrimes Senior Member

    Joined:
    Jun 7, 2013
    1,740
    444
    4
    Location:
    New Mexico, USA
    Vehicle:
    2018 Prius Prime
    Model:
    N/A
    Might have been a hot battery, or some call for cooling in the hybrid system. Even a hot ICE can call for cooling.
     
    #2 rdgrimes, Jun 25, 2013
  3. Former Member 68813

    Former Member 68813 Senior Member

    Joined:
    Oct 3, 2010
    3,524
    981
    8
    Location:
    US
    Vehicle:
    Other Hybrid
    Model:
    N/A
    The more I think about it, it was either ECU fart or an abortive case of unintended acceleration.
     
    #3 Former Member 68813, Jun 26, 2013
  4. David Beale

    David Beale Senior Member

    Joined:
    Jul 24, 2006
    5,963
    1,981
    0
    Location:
    Edmonton Alberta
    Vehicle:
    2012 Prius
    It's not unusual. I've seen it in both Pearl (GII) and Pearl S (GIII). I wouldn't call it a glitch, I'd call it normal operation.
    Remember, it's not the coolant temp that's monitored if the A/C is off, it's the cat temp. It's possible it was on the edge and drifted down causing the engine to start, then drifted up, causing it to shut down.
     
    #4 David Beale, Jun 26, 2013
  5. alekska

    alekska Active Member

    Joined:
    Feb 14, 2010
    435
    138
    0
    Location:
    Atl
    Vehicle:
    2005 Prius
    It was like:

    Engine ECU: "Temperature is dropping! I'm going to start the engine now to warm up back to operational temp !"
    Body ECU: "Wait a little ! Stop that engine! We are not moving and outside temperature is high"
    Battery ECU: "Yes, stop it now, I'm almost full ! "
    Traction ECU: "I confirm, the brakes are on, we are not moving. Somebody tell that Engine ECU do not panic!"
    :)

    - Alex
     
    #5 alekska, Jun 26, 2013
  6. Former Member 68813

    Former Member 68813 Senior Member

    Joined:
    Oct 3, 2010
    3,524
    981
    8
    Location:
    US
    Vehicle:
    Other Hybrid
    Model:
    N/A
    LOL!!!
     
    #6 Former Member 68813, Jun 26, 2013
  7. kgall

    kgall Active Member

    Joined:
    May 3, 2009
    984
    152
    2
    Location:
    Olympic Peninsula, WA
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Jacek,
    I have occasionally noticed quick on/off or off/on ICE cycles when stopped. I couldn't tell you if they were with or without A/C or fan on.
     
    #7 kgall, Jun 27, 2013
(You must log in or sign up to post here.)