No Voltage to Compressor

Discussion in 'Gen 2 Prius Main Forum' started by Tender Moses, May 11, 2021.

  1. Tender Moses

    Tender Moses New Member

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    Where is exactly is the AC inverter fuse located within the inverter unit for the 2nd generation Prius ?
     
  2. Tender Moses

    Tender Moses New Member

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    Everything thing about the air-conditioning works well apart from the compressor turning on, so I separated the cable junction and tested for 201 voltage from the inverter unit but it was 0 voltage there I have read about the so called fuse some where tried to find it by opening the unit without success, I think I may be looking at the wrong location, please I do need you help on this
     
  3. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Let me ping @Dxta - and see if a physical connection might be made.
     
  4. ChapmanF

    ChapmanF Senior Member

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    The compressor is not powered in a Gen 2 Prius the same way it is in Gen 3.

    If the car were a Gen 3, there would be two orange high-voltage wires to the compressor, and they would supply 201.6 volts DC when the car is READY.

    In a Gen 2, however, there are three orange wires, not two, and you are not looking for 201 VDC, you are looking for a three-phase AC waveform, and only when the HVAC controls want the compressor to run.
     
  5. mr_guy_mann

    mr_guy_mann Senior Member

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    Do you have the capability to view codes and data for the A/C system or the hybrid ecu? If there was a "blown fuse" I would expect to have a code somewhere. You need to be able to see why the car isn't (can't?) turn on the compressor. Could be a problem with a pressure sensor or evaporator temperature sensor, but without a compatible scanner you are guessing.
     
  6. Tender Moses

    Tender Moses New Member

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    Ok I have a toyota Techscreen scanner so I will a check today and get back here with findings. Thanks for your concern
     
  7. Tender Moses

    Tender Moses New Member

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    After doing a self diag on the AC system it came up with these codes
    23 (4) ........................... Pressure Switch Circuit
    41 ....................... Air Mix Door Servomotor Circuit
    42 ..................... Air Inlet Door Servomotor Circuit
    43 .................... Air Outlet Door Servomotor Circuit
    From this report what and where should I be looking at ?
     
  8. mr_guy_mann

    mr_guy_mann Senior Member

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    I would look at a wiring diagram to see if those 4 items have any circuits in common. Then specifically I would look at and diagnose the fault with the pressure switch/sensor circuit. I would expect a problem there to prevent compressor operation.

    Posted via the PriusChat mobile app.
     
  9. Dxta

    Dxta Senior Member

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    The AC fuse is covered inside the inverter, as you open the inverter cover. It's a glass type fuse.
     
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  10. Tender Moses

    Tender Moses New Member

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    Thanks for you comment, I have opened it several times looking for it but without success, do you please have a picture of it ?

    Mr guy, how can I get the wiring wiring diagram as advised, thanks
    Mind you my one is a 2005 2nd gen Prius
     
    #10 Tender Moses, May 14, 2021
    Last edited by a moderator: May 17, 2021
  11. Tender Moses

    Tender Moses New Member

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    Thanks I just downloaded the AC wiring diagram, would do as you suggested
     
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