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P1122, P0446,P0606,P0172

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Paul Schenck, Nov 30, 2018.

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  1. 05PreeUs

    05PreeUs Senior Member

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    Cleaning a MAF will not do a thing for rich codes, they do not work that way, it would make the condition WORSE if it did.
     
    #21 05PreeUs, Dec 5, 2018
  2. m.wynn

    m.wynn Senior Member

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    I did not say this is for sure the reason for Paul's P0172, just that it's been a quick and dirty "fix" for me the last 4 or 5 times my daughter's '07 has coded P0172 for the past 1/2 dozen years. I use quick and dirty "fix" to imply no diagnostics are performed aside from Techstream confirmation that the code goes away and fuel trims return to normal post maf/tb cleaning. This on a car which passes NYS emissions yearly without issue, despite some knucklehead (me) using maf/tb cleaning to beat back P0172.

    Maybe I'm misunderstanding you here, but are you saying a dirty maf won't or can't cause P0172 and that cleaning a maf cannot remedy P0172?
     
    #22 m.wynn, Dec 5, 2018
    Raytheeagle likes this.
  3. Paul Schenck

    Paul Schenck Active Member

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    Took the valve I had replaced recently as it was easy to get to. Here is what I learned, and what I found inside. Like Patrick said putting voltage to the motor wires (pink and Black on the valve side and purple and yellow at the connector. I used 18volts because it was handy. You can see the results of the test on the paper. There are only 5 wires however less than I expected.

    The motor didn’t turn at first so I opened the valve up making it easy to see what goes where and why. After removing the worm gears I could spin the motor with my finger so I applied voltage again and everything works as it should.there does seem to be some grit ?? Which I cannot explain so I’ll have to investigate a bit more and clean it up before I trust it.
    Thanks for the help IMG_6966.jpg IMG_6968.jpg IMG_6957.jpg IMG_6961.jpg IMG_6959.jpg IMG_6965.jpg


    iPhone ?
     
    #23 Paul Schenck, Dec 5, 2018
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  4. Paul Schenck

    Paul Schenck Active Member

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    This valve made it 397,000 miles before engine failure you can see the radiator flush at 200,000 was not enough to keep things pristine.


    iPhone ?
     
    #24 Paul Schenck, Dec 5, 2018
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  5. Cammac

    Cammac Junior Member

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    Hey Paul sorry to bump this older topic but did you ever get the P1122 code figured out? I’m dealing with a similar issue after replacing my CCV
     
    #25 Cammac, Jun 27, 2019
  6. Paul Schenck

    Paul Schenck Active Member

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    Patrick and I decided it was a code thrown because of the P0606 ECU processor


    iPhone ?
     
    #26 Paul Schenck, Sep 17, 2019
    SFO likes this.
  7. redwald

    redwald Junior Member

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    Hi Paul, hope you're still around after a year.

    I just replaced the Coolant Control Valve but am still getting the P1121 & P1122 DTC. Do you remember if you had to replace the ECM to cure this ?

    I haven't yet done a complete drive cycle to try to clear codes yet, still trying to research how many miles, starts, stops, speed, etc I need to do. Hopefully that will clear the codes, I need to get this car smogged. Oddly enough the CEL (MIL) isn't lit on the dash.
     
    #27 redwald, Sep 30, 2020
  8. Paul Schenck

    Paul Schenck Active Member

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    Mine corrected the code immediately


    iPhone ?
     
    #28 Paul Schenck, Jan 20, 2021
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