looking for help with this 2002 truck R16N-01 115. dc traction and hyd motors. service light is flashing constantly. no traction or hydraulics. i have heard it,s a canbus or controler fault but there is no codes displayed. how can i get it to display codes or could it be a broken canbus wire. steering will centre @ key on , display showing selected direction and which way the wheel is pointing. have checked the fuses. horn works. any pointers are appreiciated !!cheers