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Engine rattle and U0100 error

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Daniel Pavelea, Jun 28, 2019.

  1. Daniel Pavelea

    Daniel Pavelea New Member

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    Hello

    First i am new to this so sorry if i posted wrong.
    I have recently changed the spark plugs on a 2012 Toyota prius shortly after i got the Check hybrid system and the engine won't start .
    Plus the relay from the picture started buzzing and got the U0100 error from the picture.

    But if i keep the computer conected to the car it doesn't buzz anymore and after i reset the error the car will start ok.
    Do you know what could it be ?
    I will try to change the integration relay from the picture first. IMG_20190627_202253.jpeg received_620248482127104.jpeg

    Posted via the PriusChat mobile app.
     
    #1 Daniel Pavelea, Jun 28, 2019
    Tomass 2 likes this.
  2. tankyuong

    tankyuong Senior Member

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    Check all connections
     
    #2 tankyuong, Jun 28, 2019
  3. bisco

    bisco cookie crumbler

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    welcome!
    how many miles/km on her?
     
    #3 bisco, Jun 28, 2019
    Last edited: Jun 28, 2019
  4. Daniel Pavelea

    Daniel Pavelea New Member

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    Hey
    280000 km
     
    #4 Daniel Pavelea, Jun 29, 2019
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  5. bisco

    bisco cookie crumbler

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    thanks, do i understand correctly?

    1) you got the check hybrid system

    2) engine wouldn't start (or car wouldn't make 'ready'?)

    3) you changed the spark plugs

    4) relay started buzzing and you got U0100 trouble code at what point in the above sequence?

    5) what computer/software do you have connected to the car?

    6) what function does the integration relay serve?
     
    #5 bisco, Jun 29, 2019
  6. Daniel Pavelea

    Daniel Pavelea New Member

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    Hey
    Fixed it today , the problem was a bad grounding from the engine
    I changed the spark plugs because of the engine rattle and after the relay started buzzing and the erors happened, so 3-1-2-4
    I use a deplhi system and the integration relay from what I understood it replaces multiple traditional relays so it saves space and weight nu doing more than one relay.
    After i disassembled it i found out there are 4 smaller relays in IT.
     
    #6 Daniel Pavelea, Jul 2, 2019
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  7. bisco

    bisco cookie crumbler

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    well done!(y)
     
    #7 bisco, Jul 2, 2019
  8. Masood

    Masood New Member

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    Dear
    How you fix the bad grounding from engine
     
    #8 Masood, Oct 29, 2019
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