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P0138 Gen2 630,000miles 320K on this engine.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Paul Schenck, Oct 4, 2022.

  1. Paul Schenck

    Paul Schenck Active Member

    Joined:
    Jun 15, 2013
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    Location:
    Fresno, California
    Vehicle:
    2005 Prius
    Model:
    II
    P3190

    A week ago, I ran out of gas unexpectedly ( I had calculated that if I was getting ~ 40mpg I would be able to drive 400miles before filling up, after all, a ten gallon tank plus one, Right?
    Well, at 365 it shut down. P0606 (ECM/PCM fault), P3190 (Poor engine performance), P0A0F (Engine failed to start).
    With a new Lithium HV Battery, I just shut off the A/C and drove it the 3 miles to a gas station, filled up, and I was off.
    Yesterday after some hard 80+mph driving codes returned . The only way to clear the code was to turn the car to accessory mode, clear it and then start it. So I Slowed down to a more reasonable 75 mph with cruise control and continued on my journey.
    When I got to the 4144 foot incline that I normally fly up at 75 mph, reaching the top with 65% Battery. I had to slow to 55 and the battery was at 38%. P0606, P0A80,P3190 ( note PA080 deteriorating battery pack when it’s a new lithium upgrade) , Despite going only 200 miles I was low on gas so I Added 8.4 gallons to the tank( maybe I didn’t fill up completely, a week ago?) and again continued for 100 miles to my destination.
    Two hours later I started my return trip. Stopping for dinner and gas 200 miles later where I
    added 3.9 gallons.
    2 miles from home 160
    miles later, P3190 , P0A0F, returns, this time with 1/4 tank remaining. I reset the code and continued home.

    So MAF? Fuel Pressure? What do you think?

    Is there a fuel pressure sensor? If not, what’s the best way to check that?

    Any other ideas, theories, diagnostics?


    iPhone ?
     
    #1 Paul Schenck, Oct 4, 2022
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
    5,297
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    0
    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Have you ever changed out the A/F sensor?

    Though these are from an old manual, did you have a chance to go through the related workups (below) already?

    DTC P0A0F has five (5) subcodes (which may help diagnose), does your OBD2 scanner offer the related INFs (subcodes)?

    Here is the workup for DTC P0A0F with an INF (aka subcode or detailed code) of 204, 205, 533, or 534 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8CPDF%E6%A0%BC%E5%BC%8F/Prius%20Service%20Manuals%202004/%E4%BF%AE%E7%90%86%E6%89%8B%E5%86%8C/04pruisr/05/21bpm/0a0f204.pdf

    Here is the workup for DTC P0A0F with an INF of 238 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21bpm/0a0f238.pdf

    Here is the workup for DTC P0138 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip0136.pdf

    Here is the step by step work up for DTC P3190 : https://attachments.priuschat.com/attachment-files/2019/10/176519_DTC_P3190_P3191_P3193.pdf

    Here is the workup for DTC P0606 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/2054m/cip0604.pdf
     
    #2 SFO, Oct 9, 2022
  3. SFO

    SFO Senior Member

    Joined:
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    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Any updates, or step by step diagnostic hurdles?
     
    #3 SFO, Oct 19, 2022
  4. JbMech

    JbMech New Member

    Joined:
    Oct 10, 2022
    5
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    Location:
    Washington
    Vehicle:
    2005 Prius
    Model:
    N/A
    See your last post for my response on fuel pressure test. Let me know if you need more help.
     
    #4 JbMech, Oct 19, 2022
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