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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
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