My Prius was used to connect Jumper CABLES WRONG!!

Discussion in 'Gen 2 Prius Main Forum' started by Samuel alikic, Nov 20, 2021.

  1. Samuel alikic

    Samuel alikic New Member

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    Hi guys,


    About few days ago I let my housemate use my prius to jump start his vehicle.. He had those yellow and black so I clearly specified to him the black one is the Neg and yellow is positive.. In ALL Regard he still goes and connects the Neg to positive and pos to negative terminal on his car while..

    So 1 min into that smoke starts coming out of my fuse box and we disconnected it immediately.. But 24hrs later I get a dash light for " hybrid battery system warning " then I go to my mechanic who goes to diagnose it with his machine and i uploaded that pic as well.. It is showing a Poa93 code, then he tells me to just go toyota since it's a hybrid vehicle and they kno how to diagnose and fix it right..

    I looked up online and this code is pretty much showing an issue with the inverter pump as the fix to it.. And how you just need to replace the electric pump to get passed that issue.. But i went to Toyota and they said best would be to diagnose it first to know what exactly is going on.. As there can be more than just that.. They said from majority of those codes it was a 3 amp fuse needed replacing..

    This has happened a week ago and first three days these lights on my dash were persistent then it went away for 2 days and came back on.. Then again 2days later it would go away.. Is this signifying something..? Do toyota priuses have this thing with the trouble lights appearing and going away..?
    Now I'm between going to the dealer and paying all they will ask after diagnostic, etc..

    Or I can just go about fixing the pump itself, maybe this is the real issue here..
    Please help guys.. Any assistance is very much appreciated..
     

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  2. richard203

    richard203 Member

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    mybe try checking if ur fuse is good or not?
     
  3. Another

    Another Active Member

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    I’d like to see a photo of inside the fuse box where the smoke came from as long as you’re changing the fuse anyway
     
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  4. bisco

    bisco cookie crumbler

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    magic smoke?
     
  5. TMR-JWAP

    TMR-JWAP Senior Member

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    The smoke was more likely from the inverter cooling water pump. It could easily be mistaken for the fusebox, since the pump is almost directly below it. The light can be intermittent because the inverter will not be "overwarm" 100% of the time. The car could be driven for days at low speeds or low temps and the warning light will never come on. Drive down the road for 10 minutes at 60mph, and the light would probably come on due to the inverter getting hot. The P0A93 means you have either a pump circuit problem or a fan circuit problem, each specified by a subcode. I have yet to see the problem be in the fan circuit. Smoke is normally a sure sign the pump burned up.

    And yes, the lights can go away. If the actual condition for the alarm does not occur for a set number of driving cycles, the warning light will go away, but the code will remain in the computer as "historical" and can still be viewed with a reader.

    I would also love for anyone, especially a dealer, to show me where a 3 amp fuse is supposed to be located in the OEM underhood fusebox.

    If this were my car? I would likely install a new pump.
     
    #5 TMR-JWAP, Nov 21, 2021
    Last edited: Nov 21, 2021
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  6. mr_guy_mann

    mr_guy_mann Senior Member

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    As others have stated, the inverter coolant pump has likely failed. Try putting the car in "Ready" mode, then remove the cap on the inverter coolant tank (next to the metal inverter cover underhood) and look if there's turbulence in it from coolant circulating. If not then the pump should be tested (for power and ground) and replaced if necessary.

    The coolant pump is electrically protected by the AM2 fuse in the underhood fusebox. If that fuse pops then the car (and dashboard) will not power up.

    Posted via the PriusChat mobile app.
     
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  7. Mendel Leisk

    Mendel Leisk Sand Pounder

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    This thread is making me cringe. Would it be too far off the mark, to say a reversed jump start is in the same league as a flooded car? Not by far...

    Think I'm with him. Then talk to your friend when you get the bill, maybe split it?
     
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  8. ChapmanF

    ChapmanF Senior Member

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    It's difficult for me to connect a reverse jump with a cooling pump failure.

    The pumps do fail sometimes, and sometimes let magic smoke out when they do.

    Mostly what I've seen reported for backwards jumps will involve one or more fuses or fuse links, and disable the car. If this car has been driven around since the backwards jump to get these diagnostic opinions, I wonder if the buddy lucked out with the jump, and also the coolant pump went.

    If the car just has a coolant pump issue, that's not a difficult fix.
     
  9. pasadena_commut

    pasadena_commut Active Member

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    The manual says not to do that. The 12V battery on this car is not meant to crank a motor. Look at that tiny little post in the fuse box, does that look like it was meant to handle the current of the much larger post on regular battery? I hope that the other car's battery had an open cell, or was completely discharged, because even a fraction of a normal 12V car battery has a lot more CCA at its disposal than a Prius 12V.
     
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  10. Samuel alikic

    Samuel alikic New Member

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    Thnaks so much for your reply.. I looked in the coolant with that cap that pops off and that's being held by a small rubber hose . . So there isn't any noise or turbulence that I noticed just silence.. I am going to try to locate that am2 fuse as you are talking about .. Again thanks so much for your answer and I will keep you posted "**. Sam A.

     
  11. Samuel alikic

    Samuel alikic New Member

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    This photo I took at night of fuse box .. Hope it's helpful.. I'll take one at daytime

    Thanks for your reply..


    QUOTE="Another, post: 3205107, member: 193753"]I’d like to see a photo of inside the fuse box where the smoke came from as long as you’re changing the fuse anyway[/QUOTE]
     

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  12. Samuel alikic

    Samuel alikic New Member

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    Thanks so much Jwap, this was the best and most complete answer for me.. It makes a lot of sense and it is very assuring. I did drive one freeway on two different occasions when the light went out and after 15-20?minutes the car gets bit warm and the trouble code comes back on..

    When I was buying the coolant pump the dealership strongly recommended that I talk to an advisor about this issue which I did. . And they are telling me to get diagnostic started as it can be 3 different things.. 3 amp fuse, water pump or the hybrid battery that is causing the performance issue light code poa93.. And my light went off again for two days coming back late Sunday night.. And if this happened I was gonna take it to dealer Monday morning to get diagnostic started.. But now I am also thinking it has to be the pump as my batter performed well since the light went off on two days of driving it.. Or it can be the fuse 2amp that is protecting the pump etc..

    Thnaks all you guys for answering.. Just wanna let you know that it helped me so much as a new driver/owner of hybrid Toyota car.. There is some thing we just don't know about when buying this car that's so good on gas mileage..


    All the BEST Guys - :))
    Sam Alikic"**


     
  13. ChapmanF

    ChapmanF Senior Member

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    One thing to keep in mind is that if the pump fails and eats the AM2 fuse, and you just change the fuse, the failed pump will eat that one too.
     
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  14. dolj

    dolj Senior Member

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    Another thing to keep in mind is that if the pump fails and eats the AM2 fuse, the car will not start at all and will appear to be completely dead.
     
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  15. Samuel alikic

    Samuel alikic New Member

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    Thanks for that valuable info, Yes I went dealer this morning and got the inverter pump, and my mechanic shop is gonna squeeze me in Tuesday morning for the swap.. So i should kno soon if it indeed was the water pump shortage.. But really don't want my prius baby, to have battery problems down the road.. This thing has rarely given me any issues period.. - :))
     
  16. Samuel alikic

    Samuel alikic New Member

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    I went and replaced the inverter pump and everything was back to normal as this was the issue at hand.. The lights don't comeback anymore and my prius baby is getting proper water cooling.. Again thxx guys for the time in answering.. All The BEST, Sam A.

    ♨️♨️♨️♨️
     
  17. ChapmanF

    ChapmanF Senior Member

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