Internal and external changes require viewing the 4EAT Phase 2 as an entirely new automatic transmission. Because it is unlikely that you will be disassembling a Phase 2 transmission in the near future, this article will concentrate on principles of operation and failure diagnosis.

The Subaru 4EAT transmission is a four speed,
microprocessor-controlled transmission. Changes
in your diagnostic approach, due to these electronic
transmission controls, are required.