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Just cleaned EGR Cooler, still having problems. Please help

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by Indy Guy, Oct 17, 2024.

  1. Indy Guy

    Indy Guy New Member

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    I've got a 2012 Prius V wagon that is still throwing codes after an EGR cooler cleaning and re-installation. Here are the codes:
    • P0171
    • P0012
    • P0101
    • P3190
    The car will often not start the ICE, but if I hit the intake track with starting fluid, it seems to start ok. What's odd is that once I get it started, and put the car into reverse gear, the engine will run fine and charge the Hybrid battery all the way up.

    Please give me your thoughts on troubleshooting this further. Thanks in advance.
     
    #1 Indy Guy, Oct 17, 2024
  2. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Just for context, what's the miles on it?

    You say it's "still" throwing codes; is that the same codes prior to the EGR cleaning? As far as I know the only EGR related code is P0401, for insufficient EGR flow. Then when head gasket packs it in it's p03XX.

    Maybe post what those codes relate to, to save everyone hunting them down?
     
    #2 Mendel Leisk, Oct 17, 2024
  3. ChapmanF

    ChapmanF Senior Member

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    P0403 is also an EGR code, set if the electrical connection to the valve is bad.
     
    #3 ChapmanF, Oct 17, 2024
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  4. rjparker

    rjparker Tu Humilde Sirviente

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    If you had no problem starting the engine and keeping it running before the egr work, then it’s very likely something you disconnected or poorly connected. Often it’s a disconnected pcv hose under the intake. Your year hates that enough that Toyota provided an ecu code fix to at least get it running with no pcv hose. Sometimes it could be a maf connector. Often people believe it’s all connected only to discover they missed something.
     
    #4 rjparker, Oct 18, 2024
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  5. ChapmanF

    ChapmanF Senior Member

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    o_O what code fix is that? No PCV hose means about a ½-inch diameter open hole right into the intake manifold. What ECU code fix is going to get an engine running faced with that?
     
    #5 ChapmanF, Oct 18, 2024
  6. Indy Guy

    Indy Guy New Member

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    Thanks for the replies already guys. Sorry, I'm new to the 3rd Gen & V issues. I've had over 14 Gen 2 Priuii.

    I bought this one inoperable, throwing many of these same codes (in addition to a low hybrid battery level code). I thought it only needed the EGR cooler cleaned. I followed the procedure for cleaning it that you guys explained here on the site (THANKS!) but it's still not functioning. Below are the explanation of the the codes I'm seeing:

    • P0171 (System too Lean bank 1)
    • P0012 (Cam shaft position timing fault)
    • P0101 (Mass or Volume Air Flow Circuit)
    • P3190 (Poor Engine Power)
    Edit: the oil and coolant both still look good, so I don't think it's head gasket?
    Thoughts?
     
    #6 Indy Guy, Oct 18, 2024
  7. Indy Guy

    Indy Guy New Member

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    Has 212k miles on it.
     
    #7 Indy Guy, Oct 18, 2024
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  8. Indy Guy

    Indy Guy New Member

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    Anyone have any thoughts to help me out diagnosing this ?
     
    #8 Indy Guy, Oct 21, 2024
  9. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    With the miles, I'd wonder if it's on it's second head gasket, and the timing chain's off a tooth?? I'm out of my depth on that, not sure if it'd even run. How recent an acquisition is it?
     
    #9 Mendel Leisk, Oct 21, 2024
    Last edited: Oct 21, 2024
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  10. Air_Boss

    Air_Boss Senior Member

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    Either the timing chain jumped, or the sensor is mis-positioned, or both.
     
    #10 Air_Boss, Oct 21, 2024
  11. slow_wagon

    slow_wagon Junior Member

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    Well, the camshaft position timing being off could certainly result in low power, lean codes, and hard starting. I'd start with inspecting the VVT solenoid, does it sound like it's actuating when you apply 12v to it? Can you pull it out and try actuating it on the bench? If the actuator seems okay, I'd pull the timing cover off and see if the timing is jumped. Mass air flow circuit seems unrelated... are you sure it's plugged in?
     
    #11 slow_wagon, Oct 22, 2024
  12. slow_wagon

    slow_wagon Junior Member

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    Maybe try to find a wire diagram. Just spitballing, but maybe the VVT solenoid and mass air flow sensor share a ground that is damaged or missing? Or get their power from a wire with the green crusties? See if they share any common powers or grounds.
     
    #12 slow_wagon, Oct 22, 2024
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