1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 53Get this manual
Oil system pressure can be verified by use of the test point G] found on the oil pumpA gauge can be attached to monitor system operationUse this in conjunction with the oil pressure to troubleshoot system problemsswitch The oil pressure switch is on the side of the oil pump, and it receives voltage signal from the ECUIf oil pressure drops below PSI (27,6 6,9 kPa), the switch completes ground circuitThe ECU senses this, and after programmed delay, stores service codeIt also turns on the System Check"NO OIL" light, and puts the engine into S.L.OW