Keeps blowing water pumps, 3rd water pump, code p261b

Wondering if this was figured out.

 

I'm on my fourth water pump in a year. latest p261b just happened on a 2 month old oem aisin pump...wondering if there is a know recall or defect. i have to assume a bad ecm at this point...any other ideas. literally everything else has been tested

 

I'd be curious whether the three pumps actually got 'blown' or if they'd have worked ok on a bench test before and after and the code is being reported for some reason besides the pump.

(For any prolonged bench test of a pump, you'd need to somehow mount it and supply it with coolant to pump.)

When you say "OEM Aisin pump", do you mean one that you bought from Toyota and was made by Aisin, or one that was made by Aisin intending to sell to Toyota but they changed their minds and ground off the Toyota logo and sold it to you?

 

Any electrical harness or connector damage and has anyone ever dumped anything other than coolant into the system. Has the cooling system ever been flushed? Are you monitoring the ECT in real time?

 

Im not too proud to admit that everyone was wrong but you guys. Had my pumps tested and they were all in spec, then had an electrician friend look at my wiring and he immediatley saw the problem... we alI now agree is an objectivley a terrible connector design causing a bad ground.
The best advice we can give to anyone who has this happen is to push the back of the pins rubber housing completely forward in the round chambers and even glue them from sliding out. from what we can gather heat will cause the rubber gussets that hold each wire to slide out like a hotdog in a bun, so if back of your case is not flush and the conduit nodes are bulging out even a mm it will cause a sporatic bad ground and ruin your waveform signal which only needa something like 3 seconds of interruption to shut down your car into hybrid system malfunction...so again even for the mechanics, even if all the the wires are tested and the connector locks in place. if the pins are not fully held at the face of the connector they will not sandwich down tight enough after a long hot drive a bumpy road will equal prius death. good luck all.

Thanks you were right again.

Good news is I'll never need another pump