1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 389Get this manual
E,LECTRIC SHIFT PROGRAM (ESP) Normal Inspect the change switch (page Normall 17), Abnormal Fau lty change switch
DUsconnect the contro unit (ECU) '6P and change switch 4P connector, Check for continuity between the control unit 16P connect,o and change switch 4P connector terminal 01 the wire harness side
Open circuit in related wi,re' Loose or poor contacts of rellat,ed te rminal