1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 355Get this manual
13-19 DF40DF50 "K1" (01) model 16Return throttle to full closed position only after the O2 feedback operation at all zones has been successfully finished17Approximately 10 seconds after closing the throttle, the buzzer will sound as follows: If the total feedback operation was successfully finished, series of short (0.5 sec buzzer sounds will be heardAlso "FINOK" is displayed(FigC) If the total feedback operation failed, series of long (3 sec buzzer sounds will be heardAlso "FINNG" is displayed(FigD) 18If retrying feedback operation, repeat procedure used in step "12" through "16"