2001-2003 Honda TRX500FA Factory Service Manual, Page 371Get this manual
HONDAMATIC Probl em Code 3: Gear position 5wrtch system Check the ECM 34P connector (1) and th gearAbno rm al po sition sw itch 4P connecto (4) fo loose co nt act Correct the faulty part
Check fo con inuity between each gear pos iti onbnorm al swi tch wi re erm inal of he ECM 34P co nnecto (1) and ground (pag 2325)
Check the ear positi on sw itch between each terminal of the position switch 4P connector (4) and gr ound th sam manner as the pre viou step