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P0AA6

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by Shahab, Mar 5, 2019.

  1. Shahab

    Shahab New Member

    Joined:
    Mar 5, 2019
    5
    1
    0
    Location:
    Peshawar Pakistan
    Vehicle:
    2015 Aqua
    Model:
    N/A
    I bought toyota aqua x urban 2015 recently
    It’s 35000 km driven all was fine until after a driving in a rainy day next morning I got a code P0AA6 car was normal but with code it was switching to ev mode as well
    I reset it with the help of tech
    But the P0aa6 code came back again in rain so the search started everything was checked from ac compressor to invertor cable connecting inverter to ac compressor was changed as we found droplets in the grip of compressor
    But it keep on coming during rainy day
    Atlast I opened hv battery all cells voltage was 8.2 dvm
    No electrolyte leak but few copper leads has corrosion which were cleaned and put on dielectric grease on leads and battery reassembled to avoid corrosion in leads with the theory of high humidity during rain and which result in prescription on leads and provide good environment for corrosion which result in hv leak to chassis
    I am uploading few pics of batteries and scanner data
    Code is cleared again now waiting for next rainfall and see if it come back again
    Please help me get rid of ghisnP0AA6 with no sub codes
     

    Attached Files:

    #1 Shahab, Mar 5, 2019
  2. Shahab

    Shahab New Member

    Joined:
    Mar 5, 2019
    5
    1
    0
    Location:
    Peshawar Pakistan
    Vehicle:
    2015 Aqua
    Model:
    N/A
    Short wave highest value is still 0 but after three days in dry weather car isn’t showing any insolation fault P0AA6
     
    #2 Shahab, Mar 7, 2019
  3. Tbkilb01

    Tbkilb01 Active Member

    Joined:
    Jul 12, 2016
    215
    187
    0
    Location:
    Louisiana
    Vehicle:
    2011 Prius
    Model:
    IV
    2011 touring 206K lit up the MIL after I was servicing hybrid battery and cooling fan... just getting ready for summer heat. It has the solar pKg but it still gets hot in cabin!

    9F464C12-0BDB-416B-8DDB-BDBC819EFB4D.jpeg

    As I removed battery module post covers I saw them... the mean greenies attacking the nuts!


    B49D66D7-8DDB-4082-B9F9-8F2B8A0EFCC6.png

    7EB5359B-F77A-4D5E-BFF9-1D001FEBFAEB.png

    Close up shows all the detail. I decided to take the ole toothbrush Method for a shortcut in car servicing...with baking soda solution. 1937B712-743C-44F5-B276-DA7CBB09B4EF.png
    Scrubbed both sides but I left the batteries connected up in series like a dummy ...rookie mistake and very dangerous .. a BIG NO-NO... but I did remove the big ORANGE INTERLOCK ! That I did do. And I was using plastic...
    I caught most of the greenies and sprayed a lil battery post cleaner for measure. I even unscrewed a few nuts to verify.. looked good behind them -no green!... AB3A84D7-52A9-4090-8551-B62CA5DFA2CC.png

    8C5C867D-3E2F-42B0-8207-C5A6479B53D0.png

    Gotta ketchem all! like Pokémon!
    Decided to dry off battery pack with air nozzle..
    Don’t want that corrosion seeping into wires/harness...
    CC87CBE8-E8B7-4B81-8745-36FBBC3F2CF6.png


    I then went to fan and it had no big stuffy hairy linty wrapper stuff in it so I decided to use blow nozzle on it as well.

    49AE94A3-E601-41F0-BD6C-7A6A82B6FDDD.png




    I blew it out with nozzle too.
    So then I Put Prius in READY mode and all seemed good ...till the triangle lit up with MIL...
    with in minutes
    Oops !
    Went back disconnected powers..retraced my steps. Thinking 12v battery low so swapped with another... still the MIL is lit up!
    Connected the AUTEL and sure enough p0AA6
    In the hybrid control module! Decided to step back and search code description and possible causes... That’s not good! Anywhere from module leakage/failure to grounding out...to using mega ohmmeteres under hood ... doesn’t sound like allot of fun! but I did read somewhere that one possible cause could be in the BATTERY COOLING FAN module ...
    Just then a big light lit As I saw myself watching the fan spin out of control Just as I turned on air nozzle If just for a millisecond... till I put my thumb on it.
    So I thought ... hmmmm... maybe I fried it? Oh well, I can just swaptronics the one out of my 2010 parts Prius and eliminate that leg of troubleshooting... would not be time consuming at all!
    But First I decided to use the AUTEL to control fan on thru its 6 speeds and back to zero....
    I sat in seat fingers crossed and eyes closed as I put Prius into READY mode .
    Just as I looked up from the SCAN TOOL .......to the DASH...the MIL TURNED OFF!
    I checked for codes ...NADA.. none! Drove car down driveway a bit then put in maintenance mode for while...revving it up ... powered down turned back on ..left in READY mode and still no codes...
    I heard To not let the fan spin out of control but I usually remove to clean... I should’ve at Very least disconnected it!
    Sometimes if it ain’t broke don’t touch it works
    but then I would never have seen the mean greenies attacking the traction battery ... coincidence... luck... intermittent... only time will tell . For now...WHEW!
    I’m gonna do a repeat to my red 2011 touring 96K also and clean EGR/cooler and install catch can next couple of days... I gotta let today sink in.
     
    #3 Tbkilb01, May 9, 2023
    Last edited: May 9, 2023
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