1998 Johnson Evinrude "EC" 40 thru 55 2-Cylinder Service Manual, P/N 520206, Page 124Get this manual
S.L.OWarning System
This ignition system incorporates the S.L.DWwarning system, which gradually limits engine speed to approximately 2500 RPM when engine temperature exceeds 240 (116 C)To resume normal operation after the S.L.OWwarning system has activated :
Amp ModelsAllow the engine to cool to 20]0 (9]0 C) and the engine must be brought to an idle 12 Amp ModelsAllow the engine to cool to 20]0 (9]0 C) and turn it offThe S.L.OWwarning system depends on input from the temperature switch tanblue lead
Functional Test
1Disconnect temperature switch tanblue lead2Install correct test propellerStart engine in test tank and run at 3500 RPM 3Attach the engine harness tan lead to clean engine ground: Engine must slow to approximately 2500 RPM 4Stop the engineIf engine speed reduced in Step 3, test the temperature switchRefer to Temperature Switch Test, Section If engine speed did not reduce in Step 3: