2003+ Suzuki DF9.9/DF15 four stroke outboard motors service manual, Page 57Get this manual
IGNITION AND ELECTRICAL
INSPECTION
Oil pressure switch09940-44121: Air pressure gauge 09930-99320: Digital testerAir pump
Tester range:(Continuity)
1Remove the oil pressure switch 1(See page 3-14 2Connect the gauge and an air pump as shown3While applying pressure to the oil pressure switch, inspect continuityOil pressure switch function: Pressure kPa (kgcm2, psi) Less than approx15 (0.15, 2) Approx15 (0.15, 2) or over Continuity Yes No
Oil pressure switch
If the measurement is out of the specification, replace the oil pressure switch