2003 Honda ATV TRX650FA Rincon Factory Service Manual, Page 462Get this manual
SELECTABLE 4WD SYSTEM 7Failure Reproduction Turn he ig iti on switch to "OFF"Rem ov th in sp ecti on ada pto and co nnec he rear VSS co nec torTu rn th 2W D4W select switch "4W D"Test -d ri he ve icle above mph fo re tha seco nds and check hat the 4WD ind icator lin ks