Need some help with a 2006 Prius. P0A93 P00D1 MG1 inverter MG1 and MG2 winding temperature readings.

I recently got an P0A93 and P00D1 error on my 2006 Prius. Since I was driving I tried clearing it out but it came back pretty quick. Lost cruse control. I was going to let it be like that until I got home. Well I was about 6 miles from home when the car completely died. No power steering, no power brakes, no power to anything. Had to get it towed.

When I got it home I tested the 12v and did not get a reading. I have a lithium 12v that has a low voltage cutoff so I guess that may have tripped. I hooked up my bench power supply to the terminals under the hood to get the relays to kick on and my battery came back to life.

My canview has not been working for almost a year so I have not been able to monitor anything. The way it was acting I thought maybe one of the USB cables have come loose somewhere and never really had time to tear apart the car to diagnose that issue. After tearing though my car this weekend to check out the usb cables and not fixing the issue I decided to try reprogramming it. Now its working and I can monitor stuff again.

As you can see in this video this is what its doing

It did get to 215 degrees which is what I think may have thrown the codes but I dont know if that would be a real reading or not. After looking at some screens I noticed that MG1 inverter and MG1 and MG2 windings temperature are alternating between two different readings.

The P0A93 is related to the inverter pump failing from what I can tell. P00D1 I cannot find any good information on.

If the inverter pump is failing wouldn't the temperatures be accurate and not alternating? If the temperatures are alternating like that I would think it would be a sensor side related issue and not the pump side.

Can anyone with more experience with this type of issue point me in the right direction for diagnostics? Right now I'm waiting for the codes to pop up again and I will try to take it to the dealership to see what they say. I would still like to fix it myself though if I can.

 

Confirmed no movement in coolant reservoir. Would a bad pump cause the temperature reading to jump around like that? I would figure it would be stable even if the pump was not working.

Anyway just ordered a new pump and coolant. Wont be in until next week but I have to replace my Insights clutch master and slave cylinder this weekend anyway.

 

I will give an update as soon as I get it replaced.

I have the manual for it. I'll look it up and follow it along with some videos.

 

I will do that. Thanks for the tip.

 

OK so I got the pump replaced. It was kind of a pain but overall a somewhat easy fix. If you have small hands.

I blew through the tube before hooking it back up and it felt blocked by something. Its not blocked now and its pumping just fine.

I'm still getting the temperature readings fluctuating like in my video. So I dont know now if this is an issue with my canview parsing the data or if there is something wrong on the Prius side sending that data. I need to get some time to track down those sensors on the wiring schematic and see what I can fine with some probing.

I also want to find the codes for those sensors and program my scangauge to display them to see if I get the same results. If anyone knows the codes for the scangauge to display what I need I would appreciate it if you could post them.

So for now I will just be monitoring the temperature and as long as I dont get above 200F I think I will be fine. I removed 2 stoppers from my front grille block just to let some more air come through just to be on the safe side.

 

I'll check the connectors as soon as I can find the location of them.

Yeah I blew through the hose. Felt some pressure and it went away. Dont know where the blockage went to but its pumping fine.

Upper grille is unblocked. I always unblock it during the summer. Lower stays blocked unless I'm going on a long trip in 80F+ heat.

 

I'll check on the connectors this weekend thanks.

Really good movement in the reservoir. Seems to be be ok. I'll check it every once in a while though just to be sure.