LDU Quito won its seventh national championship.
The ten teams competed in a double round-robin tournament, one game at home and one away.
At the end of the Second Stage, the team with the fewest points in the aggregate table were relegated to the Serie B.
The Liguilla Final was a double round-robin tournament between the six qualified teams of the First and Second Stage.
The champion, runner-up, and third-place finisher qualified to the 2004 Copa Libertadores.