2003 Honda ATV TRX650FA Rincon Factory Service Manual, Page 472Get this manual
AUTOMATIC TRANSMISSION SYSTEM
BEFORE STARTING TROUBLESHOOTING
SELF-DIAGNOSTIC FUNCTION
OUTLINE
Th eng ine co nt ro odule (ECM) as self- iag nostic fu nct io to co nsta nt ly on it or th au to at ic tran sm issi on sys te it the Tr an smi ssio Co nt ro odul (TCM) Wh en th ECM and TCM det ect problem in th sys te m, th ey un ction as fo ll s:
t he gear po sit io in di cator th meter lin ks to notif he rid er problem he shi ft co nt ro stops in fa il-saf de and the ransmi ssion defaults to 2nd gear-
Th ECM an TCM ch eck the con di tion of the autom atic ransm issio system by detect ing the sig nals fro each sensor, sw it ch and so le noid alv hen th igni ti on switch is turn ed to "ON" and urin driv ing he the ECM CM detects prob lemth ECM in icates th pr obl em co by li nking "-" the ea po sit ion indi cator he auto atic tr an sm ission sy st em st op uncti ning whe problem occ rs, but the ve hicle can sti ll riv eTh shift un ct ion can rese by turn in he ig nition switch to "OFF" and "ON"but th shift co nt ro st ps he th ECM TCM det ects th pro lem aga nThe ECM sto res he pr oblem sy mpto as probl em code in th erasable memoryIt is necessary ret ri eve th pro blem co dels) befo re sta rt ing th diagnostic tro ubleshooting (page 24 -81