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Hybrid system light after intake manifold cleaning

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by pk123, Aug 5, 2023.

  1. pk123

    pk123 Junior Member

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    Cleaned intake manifold according to NutzAboutBolts, reassembled, and turned the car on. The engine ran for about 10 seconds, and then sputtered and rattled to a halt. Check Hybrid System light came on.

    I plugged in a diagnostic tool and the following codes showed up:
    Primary Code: P3190 [Poor Engine Power]
    Pending Code: P106A [Evaporative Emission System Pressure Sensor - Manifold Absolute Pressure Correlation].

    Any ideas what I may have done wrong?

    Car is 2010 Prius with 198,000 miles.
     
  2. PriusCamper

    PriusCamper Senior Member

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    Go back through your work and check it, you probably didn't fully reconnect something.
     
    #2 PriusCamper, Aug 5, 2023
    Last edited: Aug 5, 2023
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  3. ASRDogman

    ASRDogman Senior Member

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    Something is unplugged. You need to make sure everything is plugged in.
    If it was running before you did the work, and now it's not, then it should be simple.
    Double check all the connectors and make sure they are plugged in all the way and that
    there are no bent pins...
     
  4. pk123

    pk123 Junior Member

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    So the thing in the photo was unplugged, but I tried starting it again - the engine rattled loudly to an abrupt halt after a few seconds, and the the same error codes reappeared.

    I’ve opened the car back up and verified that there was nothing unplugged this second time.

    Could I have inadvertently smeared goo on the fuel-injector head?
     

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  5. pk123

    pk123 Junior Member

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    Just confirmed - nothing is unplugged, and I'm still getting the P3190 code (poor engine power) and Hybrid System light. The engine starts up, idles for ~10 seconds, and then rattles loudly to a stop in a way that did not happen before I removed the intake manifold. The P106A code did clear after I unplugged the 12V battery for this latest (third!) round of checks.

    Three options I can think of:
    1.) Drive it around the block and hope the code and light go away. The risk I can imagine here is that the traction battery will die on me, and I'll have to get her towed.
    2.) Try to manually clean the fuel injector nozzles inside the intake port, based on the theory that I smeared them with sludge. Or remove the fuel injector nozzles to clean?
    3.) Call the tow truck now.

    As always, I would greatly appreciate any advice you folks can give. I have DIYed strut replacements, rear wheel bearings, brakes and rotors thanks to the wisdom on this forum, but I'm starting to worry that I flew too close to the sun with this intake manifold job.
     
  6. ChapmanF

    ChapmanF Senior Member

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    P3190 indicates really poor engine power; if I'm reading the manual right, it is set when the engine produces less than a fifth of the torque the ECM is expecting. So it is seriously struggling, and my first choice would be to find out why before taking it out on the road for a spin.

    The hybrid system light is probably just a P0A0F code in the power management control ECU, really just that ECU saying "hey, I hear there's some engine issue."

    This is the kind of engine issue where the last thing you say at the end is often "d'oh, that was simple", but the process of narrowing it down to that can go on longer and take more poking around than you'd like.
     
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  7. pk123

    pk123 Junior Member

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    Well this is highly embarrassing: I had left the PCV hose unplugged. The engine runs fine now, and the Hybrid System light is off. P3190 still shows up in my code reader, but that's the only sign anything is amiss. Will take it for a test drive and see if that clears up.

    Thanks folks. I owe everyone who responded a beer - send me a private message if you're ever in the DC area.
     
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  8. Mendel Leisk

    Mendel Leisk Senior Member

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    Bingo. Don’t ask me how I know…

    easy to miss ‘cause you need to reinstall intake manifold, then reach under to reconnect the partially hidden PCV hose end.
     
    #8 Mendel Leisk, Aug 6, 2023
    Last edited: Aug 6, 2023
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  9. ASRDogman

    ASRDogman Senior Member

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    It usually is something simple when it was working before you started any work. (y)
     
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  10. rjparker

    rjparker Tu Humilde Sirviente

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    The biggest error a diy'er can do is to mess up one troubleshooting step by confirming.
     
  11. CR94

    CR94 Senior Member

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    It didn't start at all. You were merely fooled into believing it had started by the ~10 seconds of engine being cranked at idle speed. That's a common wrong assumption.
    Glad you found the problem!
     
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  12. OptimusPriustus

    OptimusPriustus Active Member

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    Does Prius crank that fast?
     
  13. Brian1954

    Brian1954 Active Member

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    Yes

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