1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 394Get this manual
ELECTRIC SHlII PROGRAM (ESP) F CONTROL MOTOR TURNS WHEN THE SHIFT SWITCH IS PUSHED DOWN WITH THE REVERSE SELECTOR NOT ENGAGED
Inspect the following befor,e diagnosing the system- Make sure the battery ,s fL.llly charg:ed and In good conditoniBlown main or sub fuse Abnormal
Inspect the reverse shift sWitch (page 21 17), Normal Disconnect the contro unit 16P and reverse shift switch 2P (red) conf'lecto rCheck (or continu ity between the control unit '16P connector and revers shift 2P (redl connector terminal of the wire harn ess sideCONNECnONGrayRadGrayRed STANDARD: Continuity