The 22R designation was first used by Toyota in the early 1980s and denotes a 2.2-liter, double overhead camshaft, four-cylinder engine. The R stands for reciprocating, which refers to the up-and-down motion of the pistons. This engine was used in a variety of Toyota models, including the Celica, Corona and Pickup truck. It was replaced by the more powerful 3S-FE engine in 1988.