Gen1 work in progress update

Update on my '02 quest for 500K (Present 223,421). Appears original bugs worked out since purchase in September '17 purchase. No issues in two plus months. Purchased a battery maintainer for 12V battery. After a few weeks of monitoring and applying 1.25 amps overnight charges, 12V appears to be maintaining good constant voltages. My target voltage @ forward fuse boxes is 12.40. Most checks reveal 12.48 or higher. My opinion is a battery maintainer is excellent investment for increasing and maintaining 12V battery life. There are quick adapter to allow very quick connection and release. If you choose to go this route, remember it is recommended to keep charging amperage below 3 amps. (my thoughts on this - lower in better)
Also placed air dams in front grill for cold weather. Worked GREAT. Temps ranger between 180*-189* with OAT in the 20's and 30's. Have a very warm day yesterday (88* OAT). Checked ICE temps (189* - 201*) with dams installed. HV Battery temps in the mid 90's, MG1(123-140), MG2 (118-124). With these #'s I won't be concerned until OAT's exceed 95*. Driving was a combo of freeway and residential. The dams cover the lowest wide opening and the two small ones just below the hood latch. Single center one I left open. If anyone needs pics, just ask. HV battery SOC stays fairly steady between 56% - 59%. (not sure how that relates but will figure that out)
High and low HV cell voltage within .21V or less. Still learning on this vehicle.
Any Gen1 owners out there wish to add information, please pass info on.
Must have equipment: Tech Stream, DVOM, PruisChat, and hand tools.
Mileage: Depends on driver. 34.5 to 45.3. Its improving as maintenance and technique improves. Most (85%) is short trips in town.
Below are the codes we have worked through:
P0420. P3191
P1128. P3101
P3190. Most or all with Triangle
Low 12V battery output (That has been handled with Battery Maintainer)
Inverter Coolant Pump (Changed)
Changed ICE oil & Filter; Trans Fluid (Toyota T-IV); Induction Air Filter; AC Air Filter.
Could have missed some things, so if curious check, my earlier post.
hope this helps some folks. This is a research experiment for me, and I'm loving it. Great vehicle. It need a little cosmetic work, but that will come later. Wife LOVES IT!!!!!

 

Thanks for the come-back. I monitor the 12V closely and if I even blinks, a 51R going in. So far all appears great. Don't think it is original as vehicle is 15 years old. As it is a test bed and for now it is primarily driven locally (city), if it shuts down we can get it. Trying to gather all the data I can on this vehicle. Will look into a capacity check on it. I think as long as we can keep it up and the HV battery stay up it should go for quite a while. Thanks very much for the input, it is appreciated. Peace