2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 133Get this manual
ENGINE CONTROL SYSTEM
CHART 10: SELF-DIAGNOSTIC CODE "4-3" Fuel injector
START Ignition switch "ON" Check "28" "36" "53" "54" terminal voltageIs result OK? (See page 3-48 YES Ignition switch "ON" Check fuel injector operating signalIs result OK? (See page 3-54 YES Ignition switch "OFF" Check fuel injector operating sound (individual)Is result OK? (See page 3-53 YES Possible cause: ECM failure Wire continuityconnection failure NO Fuel injector failure NO ECM failure Wire continuityconnection failure NO ECM failure Wire continuityconnection failure