NOT Normal P Lock Malfunction - ONLY Happens Over 80 Degrees. Never When Cooler

Glad you finally got it fixed.

I shudder to think what the shops near me would charge for weeks of testing.

 

Those are good folks. But are you positive they said "parking brake control module"? Pretty sure in a gen 2 that's not a thing.

 

I've heard about this resolver issue before somewhere probably right here That's why for this PLock malfunction it is pretty much mandatory to have the manual or you've done this hunt before and you know what's involved because I'm sure that's like a 34 page to do for this p lock business It must be one of the longer reeds and testings.

 

Yeah in that case since I have unlimited amount of these things personally I would have had to put that one aside and come back to it maybe someday but yeah those wires that run in the transmission or many and they run in that oil and some of the external covers and plugs where you can unplug these things and pull them out the wires don't look like they're a good thing but they're working so I leave them alone I mean at some point Toyota had problems with making wire covering with soy in it that rodents love to eat so I can't imagine what might have happened to the wire inside the transmissions and other places but hey it's a process.

 

Now I'm wondering if that resolver wiring issue could be caused by incorrect or seriously broken down transmission fluid? That is interesting I believe that wiring runs in the transmission fluid or it sees the transmission fluid or something along those lines when I was poking around in my '05 parts car I had disconnected some of those covers on the transaxle to look and see how some of this wiring was connected and worked and I do believe I have to go back out there and look but I think those wires under those covers plug into gray colored plugs that I think are covered in transmission fluid or splash or something along those lines and having the improper transmission fluid that isn't copesthetic with wiring and whatnot I wonder if that would help move this problem along.

 

"Shift control actuator assembly", yeah. It contains a rotor that moves the parking pawl in and out, and a "rotation angle sensor" that reports the position of the rotor so the ECU that drives it can drive the three phases with the right timing.

I suspect the term 'resolver' here can lead to some confusion. There are two 'resolver's inside the transmission, one each for MG1 and MG2. Those serve the same purpose for MG1 and MG2 that the shift control actuator's "rotation angle sensor" serves for it. The wiring for those resolvers runs inside the transmission.

I don't think any wiring for the shift control actuator's rotation angle sensor runs inside the transmission at all. It's all inside that little actuator assembly.

Toyota doesn't call the angle sensor in that actuator a 'resolver', even though the basic purpose is the same. A resolver is one way of tracking the angle of a spinning rotor, and it's the way Toyota does it for MG1 and MG2. The angle sensor in the shift control actuator uses Hall-effect sensors to accomplish the same thing.

Because the shift control actuator uses Hall ICs for that, I can kind of imagine how they could have had the magic smoke let out while somebody was working on stuff. (It would be harder to imagine 'frying' the MG1 and MG2 resolvers, as those are just wire coils; the magic smoke for those is all in the ECU they connect to.)