P0AA6-611 Diagnoses

You have the diagram for the 611 code where it shows where you need to be looking Is it only the air conditioner We had this similar problem when we did the same engine swap for the same problem for the head gasket initially I had the compressor unplugged for about a month while I got some other things straightened out and then after I got everything else straightened out I just plugged the compressor back up and it never caused me any problems I had a bunch of other things going on at the same time a similar car Prius persona 2013.

 

When I had this exact problem after replacing the engine in my generation 3 which is just like your car at least the dashboard is in the picture you showed I had all kinds of the hullabaloo with this code and a couple others related to the HV system not being happy quite by accident I discovered pulling the HV plug from the air conditioning compressor not the sensing wires and all that on top but the HV orange plug from the compressor putting a piece of tape over the plug I just pulled and literally left it dangling right next to the compressor for about 2 weeks that's 14 days where I'm from while I troubleshot and messed with the other things which also had something to do with the hybrid battery once I got all that other stuff straightened out the car was running during this time reasonably well I might add once I got the problems with the HV battery sorted and everything seemed to be running well I literally just plug the HV plug back into the compressor and my wife was sitting in the car I made her flip the air conditioning system on immediately like immediately when I plugged up the compressor It started to run make cold and we went for a drive she was still sitting in the car backed out went for a drive got no codes no problems and had ice cold air and I expected I would. Turns out that the battery was acting up the HV battery it was corroded the nuts were frosted it looked horrible right about that time you'll see in the post right here in the thread that all this is in we had gone up to the hybrid doctor in Virginia and got a rebuilt battery for the generation 3 put it in this car that we're talking about our persona and that cleared up all the problems with the air conditioner pulling the hybrid battery down the minute we turned on the car and all this other stuff and that was that now the engine is blown up again but the air conditioner and everything still work perfectly and no we're not fixing it again It will be junk It is junk.

 

AC hv connector most likely. Think of it like a ground fault interrupter that has coded because of moisture or oil causing a very small current to ground.

https://automotivetechinfo.com/wp-content/uploads/2021/11/Diagnosing-Toyota-High-Voltage-Ground-Isolation-Faults.pdf

 

You do have to be careful washing off these cars if you're washing under the hood any water from any kind of a spray device can work its way into some of these orange connectors and even the black ones low or high voltage so after I clean one of these cars I know now that I'd be checking some of these connectors pull them apart spray them with the wire dryer or whatever let them dangle a few minutes they can only go back to what they came unplugged from and after everything is dry and done plug everything back up you only do this every few years if you ever do it at all and that seems to work very well If I wash one of these carelessly and I'm not paying attention almost all the time there's some silly code for some nonsense that wasn't there an hour ago and usually looking through the easy plugs the one for the air conditioner the one on top of the air conditioner compressor that sometimes is not a very happy camper water gets right in that that's the control unit for the good portion of the air system stuff like that so now on customers cars I don't wash them off I'm talking about under the hood I'll do it to my own but not to customers I don't have the time to play games with their stuff.