1995 Johnson Evinrude "EO" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 503151, Page 128Get this manual
Function TestsS.L.OIN
This ignition system incorporates the S.L.oWTM warning system, which gradually limits engine speed to approximately 2500 RPM when engine temperature exceeds 240 (1140 C)To resume normal operation after the S.L.OWwarning system has activated, the engine must cool to 20r (1100 C) and the engine must be turned offThe S.L.oWwarning system depends on input from the port or starboard temperature switch tanblue leadThe S.L.oWwarning system is isolated from other warning horn signals by blocking diode in the engine wiring harnessTemperature Switch
1Disconnect port and starboard temperature switch tanblue leads2Install correct test propellerStart engine in test tank and run at 3500 RPM