Research should include

filtering/sorting by engine type or concern
checking related TSBs and manufacturer recalls
obtaining procedures from service manuals
using strategy-based diagnostic procedures to collect information, progressing from a general to a more specific focus.

Process/Skill Questions:

How can researching TSBs save the technician time?
How can researching manufacturers' recalls save the technician time?
How does the progression from a general to a more specific focus relate to strategy-based diagnostic procedures?
How does an understanding of internal engine operation enable the technician to troubleshoot?