Can you have inverter pump failure without the P0A93 Code?

What codes did you find?

What are you using for a scan tool? Most generic scan tools can not communicate with the 12 or more ECUs in your Prius.

Do not buy an inverter water pump until you have a compatible scan tool that can read all the trouble codes. If you do plan on replacing the inverter water pump, only buy OEM, they last much longer than a cheap generic pump.


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You can have a failed inverter pump with no PA093 error code up until you get dash warning lights and then that error code is stored and if you aren't seeing it, that's either a problem with the app your using or a problem with your OBD2. Please let us know which app you're using and which OBD2?

 

That code reader is probably ancient and clearly isn't programmed for hybrid car specific codes. A basic OBD2 code reader that connects to your phone so you can run apps like Dr. Prius costs less than $20 and can save you a fortune in towing fees and a ruined day if you keep it in your glove box. Here's buyer's guide: Hybrid battery diagnostic and repair tool for Toyota and Lexus

 

Take a look at the Autel Maxi AP200. A thread that reviews different OBD2 scantools is linked below: Gen2 OBD2 app review | PriusChat


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02 code for a aftermarket cat ? P0420. ? That's cat below threshold code

 

The answer to the title question is yes; P0A93 isn't set by any specific pump problem detection, but by noticing the electronics getting too hot (say, because the pump isn't moving the coolant). So yes, it's possible to have the pump fail, but be driving lightly loaded in mild weather and not have any detected overheating, and there won't be a P0A93.

But with no problem detected, there wouldn't be the warning triangle either. Since the triangle showed up, there are trouble codes.

You said "Checked the codes and none came back indicating inverter pump failure." Does that mean some codes came back? What were they?

There are a couple hundred codes that can make the triangle come on; pump failure ain't the only game in town. If you're not seeing any codes from the power management control ECU (the one responsible for the triangle light), it's probably a matter of using a scan tool that isn't seeing them.

 

Did you check the AM2 fuse and the fuse box just above and behind the inverter pump behind the headlight Is that fuse burned replace it now see if you hear your pump and see things moving but you want to find out why that fuse blue the inverter pump could be getting old and tired and starting to draw too much current blowing the fuse.

 

Your air conditioner can cut out when the inverter pump is not working and temperatures are starting to get a little high I guess the system throttles back power hungry items like air conditioning stuff like that then it'll start charging the battery to a lesser degree when it gets extremely warm and then I guess after that you could start burning components up in the inverter I guess it will shut the car off when the inverter and associated electronics get hot enough to put this in perspective I drove around for 4 days without an inverter pump all local but still doing my 120 mi almost a day and if I'm not mistaken it was summertime above 85° without driving on the highway and driving like a sane individual pretty much every stop I'd get out and feel my inverter hose and related hoses and they were maybe 118 1:15 somewhere in there never set off any lights in my air conditioner never cut off but I was able to make my air conditioner cut off after I got the pump in and was still experimenting around I was able to make my air conditioner stop working by getting the temp up enough. The pancake type pumps that are used for this inverter setup are seemingly starting to have problems It's manufacturing thing it looks like I don't know if it's Asian's problem or other people making them It seems to me it's a very simple pump you'd have to try to deliberately screw something up to mess it up like the circuit board or the plug that burns up I mean I don't know how you do that make it out of to thin material or something.

 

Now just unplug the inverter pump leave the bracket in the car and just undo the gold bolts that hold the black pump to the gold bracket withdraw all the pump and install the new one the exact opposite take it off the bracket and put the new gold bolts and the new pump on your old bracket It's a lot easier look at the socket on the pump and see if you see any burn marks on any of the pins.

 

The inverter coolant pump does just that- moves coolant through the system to carry heat from the inverter and transaxle to be "dumped" by the radiator.

If the inverter gets too warm, it will disable the A/C compressor, then probably begin to limit drive function before setting the overheat code and disabling the car.

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but you never used a prius compatible scanner?