From the Overview: "On September 25, 2019, President Trump and Prime Minister Abe announced they had finalized a limited bilateral trade agreement consisting of tariff cuts on agricultural and industrial goods and commitments on digital trade. The two sides stated their intent to begin negotiations on a more comprehensive deal after this initial agreement enters into force. [...] Notably, the limited agreement does not include trade commitments on motor vehicles, a long-standing area of bilateral tension. On May 17, 2019, following an investigation by the U.S. Department of Commerce under Section 232 of the Trade Expansion Act of 1962, President Trump proclaimed motor vehicle and parts imports, particularly from Japan and the EU, a threat to U.S. national security. [...] Alleviating the auto tariff threat was a key objective of Japan in the recent talks."
CRS In Focus, IF11120
Congressional Research Service: https://crsreports.congress.gov/