The l60 system teaches you the logic behind the numbers:
Prior to systems like the L60 EPC, Toyota parts identification relied heavily on Microfiche—sheets of photographic film containing tiny images of parts diagrams. Parts counters were equipped with magnifying viewers. The process was slow, manual, and prone to error as microfiche wore out or were misfiled. toyota electronic parts catalog system v1.0 l60
The introduction of the Electronic Parts Catalog V1.0 was a paradigm shift. The l60 system teaches you the logic behind
Even a stable system like v1.0 l60 has quirks. Problem: Part number shows "NC" (Not Current)