RTOD (Red Triangle of Death) after hard braking - running on engine only

2005 prius 150k.
I was driving today and had occasion to brake hard, going abut 40, and the tires screeched briefly. It was not a real emergency stop, but I had to slow faster than I intended. Stuff in the car all came forward, but then all was ok. Except...
The red triangle came on, along with the VCS, the circle in parentheses, and the pink car with exclamation on the center console. Also, cruise control no longer works.
The car still runs, but looking at the info screen, it was seemingly only running on the engine- not on the battery at all. I have not yet done a scan for codes- will do tomorrow. I did disconnect the battery and try again- the RTOD was off at first after starting, then came on. I also did the computer reset- ODO & brake while shutting down and back on. No change.
I don't understand how hard braking could trigger this. It seems like some fuse related to the inverter must have blown.
This car did have the inverter coolant pump failure and was replaced at the dealer under recall.
Any guesses?

 

After struggling to get my phone to connect to a bluetooth odb adaptor (why is is this always so hard?), Dr Prius shows P3000 and P084 battery codes, and no ECU codes. It also shows the battery voltages looking pretty OK. We have 3 gen 2 priuses and I installed a grid charger on all. So, I have been in there messing with the connections to the HV battery and the cooling fan.
Since a mechanical action (slamming the brakes) triggered this, I have to think that something shifted and opened a connection.

Sorry about the acronym- I thought RTOD was common parlance. It is used a lot on this site.

 

I meant to say no ENGINE ECU codes- which is the wording that Dr Prius provides. And yes, P0A84.

I uncovered the battery and connections just now, as well as the patch into the cooling fan that the grid charger uses. I plugged in the grid charger and the cooling fan came on, and it appears to be charging normally.

I've not yet checked all the fuses, but that is my next step.

And here is a dumb question- is there a big fuse somewhere for the HV battery? I've not found any reference to it.\

Also, I think I'll put a 12v charger on, in case its voltage is minimal.

I do have techstream running on an old laptop. I will hook that up shortly.

 

I found that the connector for the cooling fan has 2 corroded connections. Apparently this is a common issue? I'm going to bypass these connectors and install spade lugs.

After I fix this, can somebody tell me the best way to tell the cooling fan to stay on high all the time? And is this a bad idea?

 

Ok-
I bypassed those corroded pins, and I bench checked the relay. It was good and still same problem.
I run techstream and it still reports P0A84 (battery pack cooling control circuit low).
I tried the active test which is supposed to let you try the different fan speeds. It first says "error code 0xA1050301". I try again and it says "ECU cannot perform the requested active test".
I wonder if techstream can be a little more specific?

I have verified that the fan itself is fine, because my grid charger powers it full blast when it is charging.

I tried Torque (pay version) and it gives a code P3190. If I ask it to clear codes, it does turn off the triangle and error lights for a few seconds, then they come back, then vanish again, then come back.

I've been looking carefully at the wires around the HV battery ECU and reseating connectors. What is the next step? What would cause the err reported in techstream?

Also, I don't see anywhere in Torque where I can force the fan speed settings. I've look for special prius plugins and not found.

 

I am using a mini-VCI cable.

When you say "repair manual", do you mean the official Toyota manual? It appears that I need to pay $65 for a 2 day subscription to the professional diagnostic. Is there a cheaper way?

 

Wow- EXACTLY what I needed! Thanks so much! I was getting really depressed about fixing this, but I have new hope!
I have uploaded those files- where should I post a link (in this thread??)

 

This is resolved now, mostly. I'm embarrassed to say that the problem was a blown fuse. I thought I had checked the battery fan fuse but apparently not. Replacing this cleared the CEL and other lights but not the red triangle. I had to connect to techstream and clear it there. If I had been able to connect to Dr Prius, I could have cleared it there as well.

Sorry for all the brain power expended on a simple blown fuse.

I still do not know how slamming on the brakes could cause that battery fan fuse to blow. All the wires are battened down and look fine.

Usually when I try to connect to a bluetooth ODB device in DrPrius, I get a cryptic socket error. Sometimes forgetting the ODB and re-pairing does it- sometimes not. Sometimes I cannot get my phone to detect the ODB. I bought a fairly pricey Foseal wifi ODB device and I've never- not once- gotten it to work. Why is this so hard?