2013 Yaris hybrid 1.5l 178k km P0A80 fault

I would appreciate if I could get some direction on diagnosing and
fixing this fault.

When I start the car, the engine and car symbols are lighted up.
Using Dr. Prius, the only error is P0A80.

Attached are photos of Dr. Prius battery monitor. I tried to
do the battery test by fast accelerating and decelerating and the
percentage didn't go over 60 something percent so I couldn't
do the complete test.

 

Delta SOC doesn't seem to change. The battery voltages and internal resistances
seem rather uniform

 

2013 Yaris hybrid 1.5l 178k km P0A80 fault

I would appreciate if I could get some direction on diagnosing and
fixing this fault.

When I start the car, the engine and car symbols are lighted up.
Using Dr. Prius, the only error is P0A80.
A couple of things that stand out for me:
- blade voltage 8.2V (too high ??)
- module voltages and internal resistance rather uniform
- delta SOC around 40% and not changing
- can't perform Dr. Prius battery test as fast acceleration/deceleration don't
get the percentage charge above 60 something % (not sure if I'm
doing this right)

Attached are photos of Dr. Prius battery monitor.,battery test (only first phase) and
Battery monitor log

 

I turned the car on and the engine kicked in just a few seconds afterwards.
I then took several screenshots. I don't have any experience in diagnosing
hybrids, so what I'm going to say is just my thoughts/may not be relevant:
What is confusing to me about saying anything about the modules is that although the battery voltages are
not balanced they don't have a large variation (the bar graphs seem to exaggerate the difference
as that is their task) and the bar graphs constantly change and in only 3 screen shots
we see 3 modules with low voltage but it's always changing. What should I do next ?

 

In neutral, without anything else turned on, it is discharging at 1A and it will
take ages to go down above 40% - should I just continue at this slow discharge
(which I presume is the healthiest for the battery) or speed it up a bit ?

I went down to 43.1% and stopped there (your warning about the 40% scared me a bit)
Here's the progression



There's only a variation of .19V between the modules

 

Couldn't answer sooner- something wrong with the Prisuchat login.

Your input is much appreciated. Yes, the car still runs with the engine and car symbol lighting up.

At the moment, I'm trying to get my head around all the steps/gear for the reconditioning process.

I saw TMR-JWAP's thread
Just Another HV Battery Thread and Experiments | PriusChat
and posed a few questions at the end of that thread - hoping he or someone will set me straight
so that I understand the whole process in detail.

To start with I would like to further monitor the block voltages as you suggest so
that I have additional information to the Dr. Prius graphics above. In TMR-JWAP's thread
I mentioned above, in post #5 there is a graphic of how the modules behave under load.
Does under load mean turning on eg. A/C while in neutral ?
Which app/tools are needed to obtain the graphic and what apps/tools would you suggest ?
I have the VeePeak OBD2 and have ordered a mini vci.

 

Did some more digging and correct me if I'm wrong both Techstream and
Torque pro give the possibility of producing the voltage charts (I have OBD2
and am waiting for mini vci, so will try Torque pro first) - now I'd just
appreciate an answer on what test is used for putting modules under load
and what test or tests I should do now (I'm a bit hesitant on doing any more
driving/tests than necessary as I'm worried about damage to good modules
so want to be sure I do the right tests to better identify problem module
before removing battery and checking modules/wiring/oxidation etc.)

 

Have heard of various "load tests" which can be performed on the battery while it is still
in the car/driveable : driving (acceleration/deceleration), parking and turning on air conditioning
while in neutral - there's probably others - is there any advantage of which method is used
in better identifying faulty module?

 

CQ3 charger arrived. The battery is still complete but the modules have just been disconnected and are
sitting now for about 1 week. Open circuit voltage of all modules is between 7.70V and 7.68V.
I haven't done any load test yet. As Dr. Prius showed internal resistance between 21mOhm-22mOhm
for all modules, I was thinking of not stressing the modules unnecessarily. Is it wisest to do the
load test with light bulb or try a charge discharge cycle ?