1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 378Get this manual
DF40DF50 "K1" (01) model 13-42
CHART3SELF-DIAGNOSTIC CODE "3-1"
Ignition switch "OFF"Check IAC valve resistanceIs result OK? (See page 13-35 YESIgnition switch "ON"Check "18" terminal voltageIs result OK? (See page 13-34 YES Possible causeIncorrect by-pass air screw adjustment IAC valve failure (mechanical) IAC passage failure (clogged hosesilencer, etc ECM failure Wire continuityconnection failure NO ECM failure NO IAC valve failure
CHART4SELF-DIAGNOSTIC CODE "2-4"
Ignition switch "ON"CrankingCheck CMP sensor signalIs result OK? (See page 13-38 YES Possible causeECM failure Wire continuityconnection failure NO CMP sensor failure