Toyota manufactures and sells diesel passenger vehicles in almost every auto market in the world where they do business, except the U.S. No clue why they choose not to sell diesel passenger vehicles, here. However, they do manufacture 3, 4, 5, and 6 cylinder diesels for marine and medium/heavy duty truck use around the world. Hino is the Toyota truck brand currently marketed and sold in the U.S.
It would be a seemingly simple design exercise for Toyota engineers to adapt one of their existing diesel motors to the Tundra platform and totally kick butt in the U.S. light truck market. Unfortunately, not their "cup-o-tea"...
Look how many years before they put a full-size pickup on the US market. They sure don’t seem to rush into anything
