Error P3221/315 GENERATOR INVERTER TEMPERATURE SENSOR CIRCUIT RANGE/PERFORMANCE

Discussion in 'Gen 2 Prius Technical Discussion' started by chiciuc, Jul 26, 2018.

  1. chiciuc

    chiciuc Junior Member

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    I have error P3221/315 GENERATOR INVERTER TEMPERATURE SENSOR CIRCUIT RANGE/PERFORMANCE on Prius 2 (2006) EU.
    I already checked
    - inverter coolant level - ok
    - auxiliary battery voltage - ok
    - inverter water pump - ok

    I noticed the big difference of inverter temp MG1 (97 oC) and inverter temp MG2 (44 oC). Something is wrong
    Any advice?

    IMG_20180725_144651.jpg IMG_20180725_183305.jpg IMG_20180725_144425.jpg
     
    #1 chiciuc, Jul 26, 2018
  2. SFO

    SFO Senior Member

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    #2 SFO, Jul 26, 2018
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  3. chiciuc

    chiciuc Junior Member

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    thanks. I will check.
     
    #3 chiciuc, Jul 27, 2018
  4. edthefox5

    edthefox5 Senior Member

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    The inverter pump may be working but poorly. Should look like the fluid is boiling when you look at reservoir in ready. If it’s just barely moving that’s an issue in this heat.

    If you Have never changed the inverter coolant or trans fluid
    Now is the time.

    Given how important the inverter coolant pump is if I saw any dtcs like your seeing I would change it ASAP.
    Since your in Romania your car may never have been serviced by the pump tsb recall years ago.

    New pump
    New coolant.
    New trans fluid.
     
    #4 edthefox5, Jul 27, 2018
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  5. chiciuc

    chiciuc Junior Member

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    thanks. I will change.
     
    #5 chiciuc, Jul 27, 2018
  6. chiciuc

    chiciuc Junior Member

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    More infos:
    - temps drops on Inverter MG1 when I running all-electric or braking.
    - temps raise when accelerating (ICE + MG2) and I heard a noise under hood (like a hole in exaust).
     
    #6 chiciuc, Jul 28, 2018
  7. edthefox5

    edthefox5 Senior Member

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    How old is the inverter coolant?
     
    #7 edthefox5, Jul 28, 2018
  8. SFO

    SFO Senior Member

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    Did you make it up to step 10 on page 4 (out of 5) on the above PDF?

    What have you discovered by working through the linked diagnostics for DTC 3122?
     
    #8 SFO, Jul 28, 2018
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  9. chiciuc

    chiciuc Junior Member

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    I didn't tested pas 9 and 10, yet. Do you think higher temps on inverter MG1 is from poor connections?
     
    #9 chiciuc, Jul 29, 2018
  10. chiciuc

    chiciuc Junior Member

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    I don't know. Car has 190.000km on odometer, until 2013 was in Belgium.
     
    #10 chiciuc, Jul 29, 2018
  11. chiciuc

    chiciuc Junior Member

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    More infos:
    - the temp drops on Inverter MG1 when I running all-electric (eg: from 90oC to 60oC)
    - the temp drops a little or remains steady when braking.
    - the temp raise when ICE charge battery

    Seems Inverter MG1 get hot when charging battery.

    PS: I have also a hole in exhaust.
     
    #11 chiciuc, Jul 29, 2018
  12. SFO

    SFO Senior Member

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    As a point of reference, my MG1 averages about 20c hotter also.
     
    #12 SFO, Jul 29, 2018
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  13. edthefox5

    edthefox5 Senior Member

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    Stop analyzing and start wrenching.
     
    #13 edthefox5, Jul 29, 2018
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  14. chiciuc

    chiciuc Junior Member

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    I did some logs with techstream. Can take a look?
     

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    #14 chiciuc, Jul 30, 2018
  15. edthefox5

    edthefox5 Senior Member

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    [​IMG]
     
    #15 edthefox5, Jul 30, 2018
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  16. chiciuc

    chiciuc Junior Member

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    - I changed the pump (inverter) and I ventilated the cooling system.
    - I opened the inverter, checked the connections including those from MG1 and MG2. all good

    Same problem.
     
    #16 chiciuc, Aug 9, 2018
  17. chiciuc

    chiciuc Junior Member

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    I replaced the inverter with a used one
     
    #17 chiciuc, Aug 6, 2019
  18. Skibob

    Skibob Senior Member

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    A year later I see. Did it help your problem?
     
    #18 Skibob, Aug 6, 2019
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