P0A93 Inverter MG1 and MG2 high temp

Discussion in 'Gen 2 Prius Technical Discussion' started by 2GenPrius, Sep 23, 2020.

  1. 2GenPrius

    2GenPrius Junior Member

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    So I've been reading over past threads already on this code. It's weird because I bought and replaced the pump from a Toyota dealership back in February 2020. No codes til now.

    I did check for the swirl in the overflow tank and it seems to be...well, swirling.

    I read how the inverters insides can get clogged with crap inside the coolant passage, yet wouldn't that affect the swirl? (Need some help with a 2006 Prius. P0A93 P00D1 MG1 inverter MG1 and MG2 winding temperature readings. | PriusChat).

    Anyone have a pic they can reference to? Do I need to open up the inverter and find out what's going on?

    Car drives fine for a bit then throws the code. Torque App pegs MG1 and MG2 temp threshold heading past 197 F degrees, highest was 210 F!

    Thanks.
     
  2. ChapmanF

    ChapmanF Senior Member

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    I imagine it does, but how many Prii would you have to have worked on before you thought you could tell a properly swirly swirl from an insufficiently swirly swirl?
     
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  3. 2GenPrius

    2GenPrius Junior Member

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    I never thought about that...but is that a sign that the MG1 and/or MG2 are about to go out? What else causes the blobs to appear in the inverter?
     
  4. ChapmanF

    ChapmanF Senior Member

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    I've only seen other people's photos of the blobby stuff, but it totally reminded me of the stuff that would form on my aluminum water heater anode rod and fall to the bottom of the tank ... aluminum oxide. Dry, it's gritty stuff you can grind with. Forming in water, it makes a weird jelly.

    Coolant is supposed to contain anticorrosives, which lose effectiveness over time, and I might wonder if the coolant was getting changed on schedule, if I saw that stuff.
     
  5. 2GenPrius

    2GenPrius Junior Member

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    Holy Lord, so I checked the reservoir again today. No swirl. AM2 fuse fine. The damn pump was purchased BRAND NEW from Toyota Dealership back in February 2020! I'm going to contact them tomorrow and ask if they have warranty on the thing.

    I did change the coolant fluid from the inverter because while I did duckbill off all the hoses to catch coolant, my friend forgot one and dumped the entire load out so I had to end up cleaning and buying fluid. I took it as a sign that 1) my friend wont listen, 2) I guess she really wanted me to change her fluids after all.
     
    #5 2GenPrius, Sep 23, 2020
    Last edited: Sep 23, 2020
  6. dolj

    dolj Senior Member

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    What did the cleaning entail?
     
  7. TMR-JWAP

    TMR-JWAP Senior Member

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    Wiping up about a gallon and a half of coolant from the floor and various parts of the car?:)

    @2GenPrius

    Keep in mind that wiring and plugs can also be a problem.
     
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  8. edthefox5

    edthefox5 Senior Member

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    #8 edthefox5, Sep 24, 2020
    Last edited: Sep 24, 2020
  9. 2GenPrius

    2GenPrius Junior Member

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    You got it.

    I haven't considered that the wiring and plugs might be bad, I figured I'd at least pinch the hoses and test the pump (bought a replacement ready to go just in case). Lousy Toyota dealer is telling me they won't warranty the pump because it was installed on the car. Guess I should have kept it on the shelf?

    I'm just a bit perturbed that it died since being installed brand new since Feb 2020. I was wondering if I got one of the shoddy recall sourced ones.
     
  10. TMR-JWAP

    TMR-JWAP Senior Member

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    Lousy Toyota dealer is telling me they won't warranty the pump because it was installed on the car.

    This is the thing about items considered "electrical". Most places will not accept returns of electrical items, but it seems a pump like this is a gray area. An easy way out for them. If it was a Toyota performed job, it would depend on what their standard warranty is? 90 days? idk for sure. DIY= they're not going to go out of their way to help. So far I've been lucky with the ones I've purchased on ebay. I try to by from ebay Toyo dealers. So far, I've done about a dozen? and they're all still working.
     
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  11. 2GenPrius

    2GenPrius Junior Member

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    Right, I bought the item off Amazon marketplace (was a Toyota dealer on there). There was no mention that electrical parts are not covered if user installed, so Amazon quickly found my point of view. I would have done the eBay Toyota OEM part route yet the car is dead in the water and I need to extract the part out to get my refund through Amazon.

    The pump wouldn't go bad as a result of the MG1 or MG2 going bad, right? Its just a simple pump that is on all the time. I thought they usually burn out after 50-70K, so I was surprised it took a nose dive this quickly. What is the normal operating temp of MG1 and MG2?
     
  12. SFO

    SFO Senior Member

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    Thought all parts were covered by :

    All OEM Toyota Parts include a standard 12 month, unlimited mile warranty, with the following "fine print":
    • The warranty does not apply to maintenance or "wearable" parts like brake pads, clutch discs, etc.
    • The warranty does not cover noise, vibration, cosmetic conditions and other deterioration caused by normal wear and tear
    • If a part fails because it was improperly or incorrectly installed, the warranty does not apply
    • If a part fails because it was used on a race vehicle, an off-highway vehicle, etc. The warranty is for normal usage.
    • The Toyota part warranty does not include reimbursement for any labor costs associated with removal or installation. This coverage is only available for Toyota dealers who sell and install the part(s).
    • The warranty described is not provided by Olathe Toyota Parts Center - the warranty is provided by Toyota USA. While we are happy to help our customers with any issues that may arise, warranty claims should be pursued by contacting Toyota directly.

    Additionally, it's important to keep proof of purchase so that warranty claims may be submitted to Toyota.

    To claim your warranty: Bring your broken part(s) to your local Toyota dealership along with proof of purchase for a replacement part.
     
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  13. 2GenPrius

    2GenPrius Junior Member

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    Dang. The dealer told me electrical part, so its not covered. I know in California, the warranty is 1 year, unless explicit in terms or the ad. I'm going to give Toyota USA a call. Talk about screwed up.

    Not sure how I installed it correctly, it's not even a pump that has a servo or clutch. The damn thing just has power and runs all the time...

    Thanks for this post, and all the other help guys/gals.
     
  14. 2GenPrius

    2GenPrius Junior Member

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    So I was reading up on the inverter coolant service interval, was thinking that the "blobs" can accumulate in the inverter passages causing it to fail...has anyone safely run radiator flush stuff?
     

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  15. 2GenPrius

    2GenPrius Junior Member

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    Did the service today. No blobs, took apart everything for good measure. Bought original SLLC from Toyota dealer, who was running a special at $21 a bottle. Not bad considering the Zerex comparable goes for $19.99 in my area.

    So so lucky inverter is ok. I was so worried I toasted it.
     
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