they are located at the huge grey fusebox connector (EA2). Black/red and light green wire I believe.
the temp sensor harness is part of the body wiring harness on the JZA70. it's very easy to make your own. late 80s/early 90s corollas use the same temp. sensor as the JZA70. also the pins from the 1JZ fusebox connector clip right into the MA70 yellow 6-pin fuse box connector.
I can get you pics of my temp sensor harness if you need it. LMK.