How about 3UZ-FE 5A/T tune? There are no JTAG contacts on the ECU 89661-50590, unlike the newer ECUs for 3UZ-FE 6A/T. I believe it can be flashed using OBD2 connection. But here might be a problems with reading stock firmware and with restoring ECU if something goes wrong while flashing.
Hi! Maybe someone have original japanese electrical wiring manual for Toyota Crown Majesta UZS151 UZS155 UZS157?
It looks like that original manual number is 6745803.
It should contain all the info about factory wiring for that car.
http://www.tkmanual.com/product/115/...