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Compressor type sound from back of idle Prius

Discussion in 'Gen 4 Prius Technical Discussion' started by Doug McC, Apr 6, 2022.

  1. Doug McC

    Doug McC Active Member

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    Location:
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    Vehicle:
    2022 Prius
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    XLE
    I went out to the garage last night after my 2022 Prius had been sitting for several hours (after a short drive to the doctor) and heard what sounded like a small compressor running under the back of the car. I’m new to hybrids so forgive me if this is a question only to me, but what on earth was it!!???
     
    #1 Doug McC, Apr 6, 2022
  2. ChapmanF

    ChapmanF Senior Member

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    Self-test of the evaporative emission control system. More info in this thread.

    Here's an illustration (but from a Gen 3 repair manual, some details might be different) of how the test works. The leak detection pump is what you hear.

    [​IMG]
     
    #2 ChapmanF, Apr 6, 2022
    2010moneypit? and Doug McC like this.
  3. Doug McC

    Doug McC Active Member

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    Location:
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    Vehicle:
    2022 Prius
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    XLE
    Thank You! I looked here and in the repair/maintenance forums, never even thought of looking in the main one. You have relieved an old man’s worry!
     
    #3 Doug McC, Apr 6, 2022
    bisco likes this.
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