Gen 3 ECM replacement

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by IwasBirchyFirst, Aug 27, 2025 at 6:28 PM.

  1. IwasBirchyFirst

    IwasBirchyFirst Junior Member

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    I'm struggling to remove this module. Back bracket is trivial. I can't even see the bolt for the front bracket. Inverter coolant hoses and at least three harnesses are in the way, but I've nudged them enough to be able to see it. Nothing.
    I've tried loosening the two screws from the bracket to the module, but they stuck tight. I may have to grind off the heads and extract the remnants. Philips screws, hard to get leverage and to keep pressure on the driver. Even tried a Visegrips on the screwdriver shaft.

    Advice or even a pic of the bracket after extraction of the ECM would be helpful.
     

    Attached Files:

    #1 IwasBirchyFirst, Aug 27, 2025 at 6:28 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    I no longer have the Gen 3s but that thing comes right up out of they're . Need to take off the plug on top to
     
    #2 Tombukt2, Aug 27, 2025 at 7:29 PM
  3. Brian1954

    Brian1954 Senior Member

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    It sounds like you will soon have two 2010 Pruii that will not be functional per the three different threads that you started. You definitely don't know what you are doing!

    Edit. Removed two redundant words in my first sentence.
     
    #3 Brian1954, Aug 27, 2025 at 7:59 PM
    Last edited: Aug 27, 2025 at 9:28 PM
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  4. IwasBirchyFirst

    IwasBirchyFirst Junior Member

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    I already have that.
     
    #4 IwasBirchyFirst, Aug 27, 2025 at 9:01 PM
  5. IwasBirchyFirst

    IwasBirchyFirst Junior Member

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    Got it! Took two ppl, holding stuff out of way, and better light. I used Visegrips to break the screw heads free.
     

    Attached Files:

    • ECM.PNG
      ECM.PNG
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    #5 IwasBirchyFirst, Aug 27, 2025 at 9:04 PM
  6. Brian1954

    Brian1954 Senior Member

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    It's likely to be worse after you try to "fix" it.

    Did you know that the engine control module (ECM) is very reliable and rarely goes bad? It is more likely that the throttle body is bad per the other thread that you started. https://priuschat.com/index.php?posts/3560048
     
    #6 Brian1954, Aug 27, 2025 at 9:20 PM
    Last edited: Aug 27, 2025 at 9:32 PM
  7. IwasBirchyFirst

    IwasBirchyFirst Junior Member

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    It ohm'd out at 3.6ohms. A spec from a different gen (2 I think) has max at 3.0, min much lower. I haven't found the repair docs for gen 3 yet, just the elec diagrams.
    Do you think that could cause the P2102 "Circuit Low" code? Is it that sensitive? I suspect it uses PWM, so maybe?
     
    #7 IwasBirchyFirst, Aug 27, 2025 at 10:15 PM
  8. ChapmanF

    ChapmanF Senior Member

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    #8 ChapmanF, Aug 28, 2025 at 7:42 AM
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  9. Tombukt2

    Tombukt2 Senior Member

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    It's online free around . The steps for this should be on a video .I just changed the TB on a jdm engine to USA fed spec and all worked . My JDM TV was bad as shipped
     
    #9 Tombukt2, Aug 28, 2025 at 8:28 AM
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