1999 "EE" Evinrude 200, 225 V6 FFI Outboards Service Manual, P/N 787025, Page 64Get this manual
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 INotel
See the oil flow and recirculation system diagram at the end of this manual
TM Warning
FFI engines have protective feature that prevents powerhead damage due to an engine cooling system overheat, loss of oil flow, alternator output exceeding 40 volts, or excessive ECU temperatureThis feature is called S.L.OW(Speed Limiting Operational Warning)A number of devices monitor engine operating conditionsAll are linked directly to the ECU, which in turn is connected to the dash-mounted System Check gauge and hornA complete listing of failure modes and their effect on engine operation can be found under the Service Codes heading in the Diagnostics sectionInitiation
When the appropriate sensor or switch is activated, the ECU responds by interrupting fuel injector operationIt begins gradual five second drop in engine RPM to threshold limit of approximately 1800 RPMThis is accomplished by cutting out one cylinder at time, until total of five are affectedThe ECU simultaneously sounds dash-mounted warning horn and turns on the appropriate System Check gauge lightAs long as S.L.OWis activated, the engine will run normally below 1800 RPMAbove 1800 RPM, the engine will run poorlyRecovery