2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 119Get this manual
ENGINE CONTROL SYSTEM
OIL PRESSURE SWITCH NOTE: Before checking the oil pressure switch, make sure the engine oil pressure is within specification1Remove the blue lead wire from oil pressure switch2Check the continuity between the switch terminal and engine body ground! 09930-99320: Digital testerTester range: ( (Continuity) Engine running Engine stopped Infinity Continuity
1Oil pressure switch
If measurement exceeds specification, replace oil pressure switch3Reinstall parts removed earlier