Before diving into the service manual itself, it is important to understand what makes this engine so significant. The Toyota 5A-FE is a 1.5-liter inline-four gasoline engine that features a cast-iron cylinder block and an aluminum 16-valve cylinder head with a dual overhead camshaft (DOHC) configuration. This design allows for superior airflow and more efficient combustion compared to its predecessors, contributing to both power output and fuel economy.