Anyone have technical information on the exhaust preheat circuit>

Discussion in 'Gen 3 Prius Technical Discussion' started by Georgina Rudkus, Apr 1, 2021.

  1. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Can't find much information anywhere.
     
    #1 Georgina Rudkus, Apr 1, 2021
  2. RRxing

    RRxing Senior Member

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    From the 2010 Repair Manual...
     

    Attached Files:

    #2 RRxing, Apr 1, 2021
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  3. Georgina Rudkus

    Georgina Rudkus Senior Member

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    Thanks! I see that there is a difference in the control valve with the Prius v, the c. I can't see the control valve in the photos. The Gen 4 has a visible control valve. Prius c exhaust.jpg F9966131-FB6E-485D-BF32-FC0E027B85BE.jpg
     
    #3 Georgina Rudkus, Apr 1, 2021
  4. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

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    @Georgina Rudkus can you ID the 2 pics? I’m thinking lower pic is 3rd gen?
     
    #4 Mendel Leisk, Apr 1, 2021
  5. Georgina Rudkus

    Georgina Rudkus Senior Member

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    The upper photo is for a Prius C, and the lower one is of a Prius v.
     
    #5 Georgina Rudkus, Apr 1, 2021
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  6. Georgina Rudkus

    Georgina Rudkus Senior Member

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    I can see the control rod for the "butterfly" valve on the Gen 3 Prius and the Gen 4, but where is the control on the Prius c and the Prius v?

    These photos are of the Gen 3 and the Gen 4.

    655A1FC5-BD89-4DDA-BB89-EC12986D2959.jpg Prius Gen 4 exhaust.jpg

    They apparently experimented with a different configuration in 2012 with the introduction of the Prius v and the c. Then the reverted to the original design introduced in 2010 for the Gen 4. Who knows?
     
    #6 Georgina Rudkus, Apr 1, 2021
    Last edited: Apr 1, 2021
  7. johnnychimpo

    johnnychimpo Active Member

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    Do the two temp sensors. Work together? Is the top one only to light up the overheating and the bottom to temp reading only?
     
    #7 johnnychimpo, Apr 1, 2021
  8. ChapmanF

    ChapmanF Senior Member

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    The one on the brown and pink wires connects to the ECM and gives a temperature reading.
    THW.png





    The one on the black and white wires connects to the combination meter and gives you an overheat light.
    TWS3.png
     
    #8 ChapmanF, Apr 1, 2021
  9. johnnychimpo

    johnnychimpo Active Member

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    Understood now why would my odb stop getting temp reading when I disconnect the one with black and white wires?
     
    #9 johnnychimpo, Apr 2, 2021
  10. ChapmanF

    ChapmanF Senior Member

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    It would help if you could indicate what you are using for your readings from the OBD (On Board Diagnostics) and if it indicates which ECU and PID it is reading the value from.

    It will probably work out best to keep one thread active on the question so the information can be developed there without being repeatedly lost. It looks like your thread over here might be shaping up best for that.
     
    #10 ChapmanF, Apr 2, 2021
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