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P3191 and P0A0F/204

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by black_jmyntrn, Aug 10, 2024.

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  1. TMR-JWAP

    TMR-JWAP Senior Member

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    Don't over complicate things. Pull the air filter cover and filter off. Have someone do the start sequence for you while you spray starting fluid into the throttle body. See if it will actually run. At least then you'll know if its ignition related, or fuel related. Could be something as simple as no fuel. Don't over complicate it.
     
    #21 TMR-JWAP, Aug 19, 2024
  2. black_jmyntrn

    black_jmyntrn Senior Member

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    okay sooo... turns out the fuel pump is good... i read once there is a newer ecu that has more time to allow the system to balance itself out versus throwing these codes. For the life of me I cannot find the thread with the specific ECU number... or is it a calibration id I need to apply?
     
    #22 black_jmyntrn, Sep 4, 2024 at 11:51 AM
  3. ChapmanF

    ChapmanF Senior Member

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    I seem to remember reading about that, and it was a calibration (after all, it's a pretty easy firmware fix to just wait a bit longer before giving up). Try looking on TIS or NHTSA for TSBs that mention those trouble codes.
     
    #23 ChapmanF, Sep 4, 2024 at 2:16 PM
  4. black_jmyntrn

    black_jmyntrn Senior Member

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    hahaha, I'm definitely not giving up... too much riding on getting this thing running.

    I did sign up for TIS and nothing was there, will check NHTSA! Thanks for the tip on NHTSA.
     
    #24 black_jmyntrn, Sep 4, 2024 at 4:31 PM
  5. ChapmanF

    ChapmanF Senior Member

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    All the TSBs are on TIS. You can also find them on NHTSA, but I don't expect anything there that's not also on TIS.
     
    #25 ChapmanF, Sep 4, 2024 at 4:45 PM
  6. black_jmyntrn

    black_jmyntrn Senior Member

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    kid you not.. in the two day membership, entered in the vin and all.. either I'm blind or I couldn't find it on the site.

    have you ever performed a ECU update? I've been trying to see if Techstream is all id need or is it just easier to find one with the updates already provisioned then swap it in.

    I'm also considering wiring up a switch and relay to the connectors on the fuel pump relay so I can have manual control of the fuel going to the engine to see if I can get it started that way.

    edit: I just found the below document on the NHTSA site... looks simple enough and its why I didn't find it on the actual website. It appears its through Techstream. :)

    https://static.nhtsa.gov/odi/tsbs/2019/MC-10164330-9999.pdf
     
    #26 black_jmyntrn, Sep 5, 2024 at 11:14 AM
    Last edited: Sep 5, 2024 at 11:23 AM
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