1. The site is migrating to a new server this week, so there will likely be some downtime during that process. You can follow along here for updates.

Are the power steering and AC compressor electric in the Prius?

Discussion in 'Gen 3 Prius Technical Discussion' started by Mrpcar, Feb 14, 2013.

  1. Mrpcar

    Mrpcar Active Member

    Joined:
    Dec 30, 2012
    542
    253
    0
    Location:
    Chino Hills, CA
    Vehicle:
    2013 Prius
    Model:
    Three
    I've noticed even in EV mode both the A/C and power steering works well, curious if they are electric?
     
  2. SteveLee

    SteveLee Active Member

    Joined:
    Sep 15, 2012
    645
    177
    0
    Location:
    North Carolina
    Vehicle:
    2010 Prius
    Model:
    I
    They are. In the Gen2 there is a belt that only turns the water pump. In the Gen3 I believe the belt has been eliminated.
     
  3. Mrpcar

    Mrpcar Active Member

    Joined:
    Dec 30, 2012
    542
    253
    0
    Location:
    Chino Hills, CA
    Vehicle:
    2013 Prius
    Model:
    Three
    WOW! So no belt at all? Everything electric? I assume timing chain instead of timing belt?
     
  4. SteveLee

    SteveLee Active Member

    Joined:
    Sep 15, 2012
    645
    177
    0
    Location:
    North Carolina
    Vehicle:
    2010 Prius
    Model:
    I
    The belt that typically turns these devices has nothing to do with timing, just turning to make them work. But yeah, going to electric for these items and taking the drag off the ICE improves the efficiency of the internal combustion engine while allowing them to still work as the engine stops powering.
     
  5. SteveLee

    SteveLee Active Member

    Joined:
    Sep 15, 2012
    645
    177
    0
    Location:
    North Carolina
    Vehicle:
    2010 Prius
    Model:
    I
    I'm no mechanic so I'm not sure about whether your Gen3 has a timing belt or chain. A word search in here will likely bring up all you ever wanted to know about it though. The more I learn about the car, the more I love.
     
  6. Mrpcar

    Mrpcar Active Member

    Joined:
    Dec 30, 2012
    542
    253
    0
    Location:
    Chino Hills, CA
    Vehicle:
    2013 Prius
    Model:
    Three
    I understand the accessory belt has nothing to do with driving the cam. But I was curious if Toyota went with timing chain or belt on the engine. I would probably say most likely chain, since it is not a high performance engine.
     
  7. David Beale

    David Beale Senior Member

    Joined:
    Jul 24, 2006
    5,963
    1,977
    0
    Location:
    Edmonton Alberta
    Vehicle:
    2012 Prius
    "Lifetime" timing chain. No belts. The internal drive chain has also been eliminated in the GIII (the GII has a chain in the drivetrain - in the "transmission").

    Boring eh? Nothing to watch or replace. ;)
     
  8. Mrpcar

    Mrpcar Active Member

    Joined:
    Dec 30, 2012
    542
    253
    0
    Location:
    Chino Hills, CA
    Vehicle:
    2013 Prius
    Model:
    Three

    Perfect, exactly what I want in a everyday cay. I am getting really sick and tired of replacing cars parts that wears out while just sitting in the garage.
     
  9. El Dobro

    El Dobro A Member

    Joined:
    Jul 12, 2011
    6,883
    3,154
    1
    Location:
    NJ
    Vehicle:
    Other Electric Vehicle
    Model:
    N/A
    I get a kick out of people looking under the hood asking where the alternator is. :D
     
  10. El Dobro

    El Dobro A Member

    Joined:
    Jul 12, 2011
    6,883
    3,154
    1
    Location:
    NJ
    Vehicle:
    Other Electric Vehicle
    Model:
    N/A
    The water pump is electric, too.
     
    Mrpcar likes this.
  11. retired4999

    retired4999 Prius driver since 2005

    Joined:
    Aug 11, 2011
    2,652
    624
    15
    Location:
    Eau Claire, Wi.
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    Great! don't ya! think!:D
     
  12. dbcassidy

    dbcassidy Toyota Hybrid Nation, 8 Million Strong

    Joined:
    May 13, 2008
    1,581
    290
    3
    Location:
    Middlesex County, MA
    Vehicle:
    2008 Prius
    Model:
    Two
    Yep chain for timing, no belt.

    DBCassidy
     
  13. dbcassidy

    dbcassidy Toyota Hybrid Nation, 8 Million Strong

    Joined:
    May 13, 2008
    1,581
    290
    3
    Location:
    Middlesex County, MA
    Vehicle:
    2008 Prius
    Model:
    Two
    That I didn't know the drive chain went away in the Gen III. How is the power routed in the Gen III now, sans drive chain?

    DBCassidy
     
  14. El Dobro

    El Dobro A Member

    Joined:
    Jul 12, 2011
    6,883
    3,154
    1
    Location:
    NJ
    Vehicle:
    Other Electric Vehicle
    Model:
    N/A
  15. Bill Norton

    Bill Norton Senior Member

    Joined:
    Dec 15, 2012
    1,754
    573
    0
    Location:
    MONW, Ks.
    Vehicle:
    2010 Prius
    Model:
    Five
    What about the AC compressor?
    I think I read it runs from high voltage DC direct from the traction battery.
    You can see the beefy wires going into the compressor and yet it is mounted on the engines accessory case.
    I suspect it is also engine driven when the engine is turning. Why else would it be mounted on the engine?

    I have the 'AC' button on my remote. I read about it but haven't used it yet.
    Can I use it like a remote starter and set the climate controls to 78° to warm the car?
    Probably not. That would be a source for a news story: "Prius parked in garage kills family when toddler presses red button". Joking....
    The pre-cool function only lasts a few minutes according to the manual.
     
  16. El Dobro

    El Dobro A Member

    Joined:
    Jul 12, 2011
    6,883
    3,154
    1
    Location:
    NJ
    Vehicle:
    Other Electric Vehicle
    Model:
    N/A
    The A/C compressor is completely electric. I would guess it's mounted on the engine so it would be isolated from the body of the car.
     
  17. john1701a

    john1701a Prius Guru

    Joined:
    Jan 6, 2004
    12,611
    5,210
    57
    Location:
    Minnesota
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Fluids get old too.

    Since the steering is electric, there isn't any of that either.
     
  18. ny_rob

    ny_rob Senior Member

    Joined:
    Feb 28, 2012
    1,968
    813
    0
    Location:
    L.I.- NY
    Vehicle:
    Other Hybrid
    Model:
    N/A
    If you look at the passenger side of the engine- you'll see the grooved crankshaft pulley is still there for AC pump, PS pump, alternator, etc... but alas- no belt on it, just a vestigial pulley that powers nothing in the gen III.
     
  19. David Beale

    David Beale Senior Member

    Joined:
    Jul 24, 2006
    5,963
    1,977
    0
    Location:
    Edmonton Alberta
    Vehicle:
    2012 Prius
    Yes, the "pulley" is still there, but it's because it's a crankshaft vibration dampener as well. It would have been rather expensive to build a different one without the pulley just for the Prius. That one is used on many cars that have the 1800cc engine, whether in Otto cycle or "Atkinson" cycle.
     
  20. edthefox5

    edthefox5 Senior Member

    Joined:
    Jul 25, 2007
    10,099
    4,780
    0
    Location:
    Clearwater, Florida
    Vehicle:
    2007 Prius
    Model:
    Two
    Runs from 200 ACV from separate section of Inverter powered by either mg or battery. Specifically not engine powered at all because sometimes the engine is not on. :rolleyes:
     
Loading...