Specifically Shinto ethics are not based on a set of commandments or laws that tell the faithful how to behave, but on following the will of the kami. So a follower of Shinto will try to live in accordance with the way of the kami, and in such a way as to keep the relationship with the kami on a proper footing.
But it's important to remember that the kami are not perfect - Shinto texts have many examples of kami making mistakes and doing the wrong thing. This clear difference with faiths whose God is perfect is probably why Shinto ethics avoids absolute moral rules.
The overall aims of Shinto ethics are to promote harmony and purity in all spheres of life. Purity is not just spiritual purity but moral purity: having a pure and sincere heart.
(the rest is in the comments under my answer)
