Battery Replacement - Low voltage error - P0AFA, P3000

Aloha - I was about to post the below but now I’m not sure.

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Original post and findings:

Doing a 2008 Prius battery replacement using newpriusbatteries

I am getting P3000 and P0AFA errors. I found that these are low voltage and vague errors indicating the system can’t see the battery. The Dr. Prius voltage results seem to confirm that.

I then checked with the multimeter on each cell and as a unit and confirmed there is ~200V for the entire battery, so the individual cells seem okay. This led me to think one of the pins in the ECU/housing or connectors was corroded/bad/missing. I think I found that that is the case and just wanted to double check with all the smart folks here.

I think the largest of the 3 connectors have at least 2 of the larger pins missing. See pics. The other two smaller connectors seem okay, but it’s hard to see.
(update: After reviewing this, the internal metal connector inserts are missing in certain holes because there are no wires going into them from the other side in the first place. Disregard?)

Apologies if my terminology for the individual components is wrong.
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Anyway, now I’m not sure where the issue might be. I’m fairly certain the cells themselves are fine, but suspect something is tripping the system into not recognizing the battery. The 12V battery seems to be working fine too. I’ve also cleared the codes using the Dr. Prius app.

 

Thank you!

Believe I have. I put just the large cover and ECU cover over it. The large cover has most of the case bolts fastened at this point.

Does the entire case housing need to be secured for it to be grounded? I followed the video from electron automotive and they were testing with just those two pieces on it.

 

Ok - Secured the full HV battery case to vehicle - no change.

Also forgot to unplug 12V battery so that was drained - replaced it today. Good times.

More pics showing the 200V and various ECU connections.

 

Alright, looks like it's working now! I think I narrowed it down to either the safety plug, re-connecting this connector (see attached img), and/or the 2 nuts on the main section of the case being attached (to help ground battery). The wiring harness connector seemed loose. I just went with the mantra "try, try again", per @2k1Toaster

Thank you all for your help.

One more question - I'm about halfway through putting everything together and notice I forgot to put on the black safety covers that go over each cell. Are these for safety/cable mgmt/rust protection/etc.? I'm guessing they are highly recommended, but how recommended? lol
I plan to (begrudgingly) open it up again and put them on, I just don't entirely know their function.

Thanks again!!

 

Okay now I’m seeing higher resistance on one of the cells compared to the rest

Video: https://mega.nz/file/Oo5WCIAC#Xu4UrME65HjDC0txICebjiZyZJVuiH7WiZ2XsE2DIm4