"Check hybrid system" failure & P0A0F code

Have a 2010 prius 3 with 140k miles. Its showing the check hybrid system message. Have tried to get car started and failure cleared by charging and jumping the 12v battery. With it jumped, still wont run. I have tried disconnecting 12v batt for 10 min and reconnecting.....thought it was fixed, as then the fault message and yellow triangle had cleared, and it showed "ready". It then started and ran....for about 5 seconds! Put it in drive and it started to move. But then the ice eng. shut down and check hybrid system warning was back on.
I Read somewhere that pulling white wire in fuse box for two minutes would reset everything and maybe fix it. This i did....it ran ok for all of ten seconds and had the same system shut down. I connected mini vci/ techstream. Did hybrid control system check, and there is only one dtc set: P0A0F, which is "engine failed to start". But it did.... and sounds entirely normal! Is this maybe a clue as to nature of failure? Perhaps the ecu that is monitoring engine status is shutting the whole sytem down because it has failed to sense signal that the engine is running? And i cant understand why Techstream cant diagnose the problem further than that. Like give more codes to guide me to the specific problem. Right now i just have A meter /dmm and techstream. Have to order the best repair manual i can get for it soany ideas what. i have the best chance of repairing this car myself rather than paying toyota dealer up the nose for repairs.
Its funny....i had just taken cap off of inverter coolant to observe if any ripples in fluid indicating that coolant is being circulated, and i could see that the pump is circulating ok. I shut off engine for a few minutes after after checking this, and a few minutes later this failure occured. Any ideas what i can check?

 

Yes it over 3/4 full. I did not notice any snowflake symbol. In the hybrid control sytem field. Does this appear right under the code or the "english translation" of code. Its new to me.

 

Yea prior to taking inv coolant cap off and dhring check and maybe a minute . after it was running fine. Then i shut it down. Perhaps 10 minutes later I attemped another start and then system went down, would not run as described.
As for the snowflake icon when it was showing the one hybrid control system DTC: yes i checked and it was there. I clicked on it but it did not open up sub-dtc's to the "engine did not stsrt" dtc. It opens a data freeze-frame window. None of the parameters seemed useful. Some wrong...like engine rpm 900? When the car is not running at all?I did note that one parameter did not seem right. It showed "state of charge (all bat)" is 14.2%. If this is the charge status of the hv battery pak, there is something radically wrong. But there is no code set for bad hv battery pak!

 

I need to get really good repair reference i guess to have the slightest hope of figuring out what is wrong. Is a Bently manual sufficient or do you have to have the toyota tepir manualsthat toyota techs use. I dont know if they are available to the public or if i could afford oneif i could get the full manual.
This is baffling, as how can any tech discover what part is bad from such a single generic code as "engine failed to start"? Has the health check really checked health of every 23+3 ecu's

 

Yes car was running fine. I bumped nothing else in engine compartment

 

A few times, like the time i tried to reset system. by pulling white wire out of fuse block for 2 minutes and then reconnecting it, the engine ran just long enough that i got it into FWD, and i moved car forward several feet before the hybrid system shut the car down. I have had a 2009 prius for 6 years, and so i know full well what a running ICE sounds like.....and i feel the strong vibrations as it starts and strong vibrations kind of like clunking when it shuts down too. Can also hear the inverter whine. But.... Looking at freeze frame data list for the hybrid control system, "state of charge (all bat) is reporting 14.2%. Is this the charge on the hv batt pak?
And i've made many attempts to get car to run today.and the longest it ever ran was maybe 15 sec. I did charge up the 12v battery. Made sure it was well charged but it did not help or change behavior at all. I only get that one dtc for "engine failed to start". Is there a way perhaps to measure voltage of hv battery pak to see for sure if its down? I thought it was the 12v battery that spun up the ICE. So its really the hv batt pak, you're saying?

 

yea, same one.

 

Is there a way i can check voltage of hv batt pak with fluke? Without having to take rear seat out to access it? If "state of charge (all bat)" is the hv batt pak, then since its showing 14.2%, yea it going to read quite a lot less than 220v, right? Maybe the 12v batt is suddenly failed? I see how to check it on the mfd. What is normal voltage?
I dont yet have a clue how to capture data as to what is happening at the moment when ice and the whole system shuts down. I wonder if O Reilly will take that 200.00 12v battery back if i replace it and it doesnt fix the hybrid system failre?

 

I have had a 2009 prius for 6 years. So i knew about the importance of inverter coolant pump working. It failed on my 2009 prius, and i replaced it myself. So i was making sure the pump on the new prius is running to prevent inverter failure. There was no symptom at all to prompt me to check. It was just P.M.