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2008 prius will only stay in ready mode for 5 seconds

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Lynda Musselman, Apr 1, 2024.

  1. Lynda Musselman

    Lynda Musselman Junior Member

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    Vehicle:
    2005 Prius
    Model:
    II
    Brought this car home today. We were told the 12v and hybrid batteries have both been replaced. It had no codes when checked with a generic code reader. Started fine 3x. The 3rd time we drove it home. It was about a 90 min drive. Had zero problems. Parked it at home and maybe a half hour later my son went to take it out for an errand and he got maybe a mile before the car lost power and went out of ready mode. We disconnected the 12v for 2 min and now can only get it to go into ready mode for 5 seconds before it gets kicked back out again. The engine does come on in those 5 seconds. I've tried looking for this problem online and haven't found much info. Any help would be appreciated.

    Thanks
     
  2. bisco

    bisco cookie crumbler

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    any trouble lights?
     
  3. dolj

    dolj Senior Member

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    Even though it sounds like the engine started it did not. The ECM is trying to start the engine by spinning it using the electric motor/generator, but it does not detect any power from the engine within the time specified, so it aborts the attempt. If you scan for codes you may find a P3190, P3191, or P0A0F.

    The bad news is, that there is a finite number of times you can do this before the hybrid vehicle (HV) battery runs out of juice, so you need to fix the problem before trying to start the engine again.

    There is a scenario where the car goes dead while driving which is caused by the AM2 fuse blowing due to the inverter coolant pump shorting out. You could test out this possibility by disconnecting the inverter pump and then replacing the AM2 fuse. You can disconnect the inverter pump by unplugging the connector shown in the attached photo.

    Prius Gen II Inverter 3 Power Connector.jpg


    Location of the AM2 fuse:

    Prius Gen II Inverter 2 AM2_Fuse.jpg


    Location of the inverter coolant water pump:

    Prius Gen II Inverter 1 Pump.jpg


    You might also be able to check the pump by putting the car into IG-ON (two presses of the power button without your foot on the brake pedal) and looking into the inverter coolant reservoir to see if you detect coolant moving.
    Prius Gen II Inverter Reservoir.jpg


    I hope some of that helps.
     
  4. Lynda Musselman

    Lynda Musselman Junior Member

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    The fuse looked like this. I didn't see the coolant moving at all.
     

    Attached Files:

  5. Lynda Musselman

    Lynda Musselman Junior Member

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    None before this happened.
     
  6. Lynda Musselman

    Lynda Musselman Junior Member

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    None at all. It just stopped.
     
  7. Lynda Musselman

    Lynda Musselman Junior Member

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    The only thing we did do, between the time I bridge it home and the time it was driven next, was plug a phone into an aux cord that was already in the car.
     
  8. bisco

    bisco cookie crumbler

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    you can get the trouble codes read at a dealer, hybrid shop or buy your own
     
  9. dolj

    dolj Senior Member

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    With the fuse in place or removed?
    The pins don't look good, but hard to tell just by looking, particularly as the fuse itself is out of focus. If you want to be thorough, you could test the fuse with an ohmmeter, but really, just replace it ensuring you have disconnected the inverter coolant water pump beforehand. I would also inspect the slot into which that fuse goes, and make sure it was clean of any corrosion and the like.
    I'm confused by this statement. What do you mean by, "between the time I brought it home and the time it was driven next". Has the car been driving since it just suddenly stopped while driving?

    If there are lights on the dash now, you should get the car scanned (using a capable scanner that can read all of the 11-14 computers). You could then post the results of that here which would be most useful.
     
  10. Lynda Musselman

    Lynda Musselman Junior Member

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    We got it going long enough to get a p2102 code
     
  11. Lynda Musselman

    Lynda Musselman Junior Member

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    I parked it when I got home and my son went to take it for an errand. We did get it running today after replacing all the engine fuses long enough to get a p2102 code.
     
  12. bisco

    bisco cookie crumbler

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