Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 94Get this manual
ENGINE CONTROL SYSTEM
CHART 3: SELF-DIAGNOSTIC CODE "3-1"
Ignition switch "OFF"Check IAC valve resistanceIs result OK? (See page 3-39 YESIgnition switch "ON"Check "18" terminal voltageIs result OK? (See page 3-38 YES Possible cause: Incorrect by-pass air screw adjustment IAC valve failure (mechanical) IAC passage failure (clogged hose, etc ECM failure Wire continuityconnection failure NO ECM failure NO IAC valve failure
CHART 4: SELF-DIAGNOSTIC CODE "2-4"