P0a72-515 engine error code help

This is where there's a phase problem on the output generator motor or something like that right I wouldn't inverter itself could finar phasing . Would think that would happen actually at the motor generator ?

 

I hope when you downloaded "the diagnostic papers" you mean you got the section for that code from the Toyota repair manual. This link might work (though when I open it the spaces look funky on the last couple pages—still readable though).

The code reports a problem with the current sensor reading for the V phase connection of MG1.

The current sensors (two of them, a main and a sub) are located inside the inverter housing. In gen 3 there's an "MG ECU" right inside that housing too, but in your gen 2 there isn't: the sensors are inside the inverter housing, but they are wired to the HV control ECU under the dash. You can see how the troubleshooting instructions tell you to check that wiring and those connections first, and if you find the problem there, you just fix it.

You can see that inverter replacement (huh, I guess they didn't sell the sensors separately?) is only the last step, only if you didn't already find the problem with the wiring or connections.

 

Easy job then . At least no messing inside trans and plentiful .

 

I don't see any need of a milli-ohm tester for the P0A72-515 troubleshooting steps.

When a wire measurement "good" value is given as "Below 1 Ω", that's just telling you it should be a wire, and not broken. The nearest handy multimeter can tell you that. When a between-wires measurement is supposed to be "10 kΩ or higher", that just means those wires are meant to be isolated from each other, not shorting. Again, any simple multimeter is good enough for that.

If there turns out to be nothing wrong with the wiring, that would seem to leave the current sensor itself. I would wish for a chance to replace only that ... you can get it separately in gen 3, but maybe you can't in gen 2.