1996 Johnson Evinrude "ED" 60 LV 90, 115, 150, 150C, 175 Service Manual, P/N 507127, Page 131Get this manual
6 in(15 cm)
DRC6251
S.L.OW Warning System
This ignition system incorporates the S.L.OWTM warning system, which gradually limits engine speed to approximately 2500 RPM when engine temperature exceeds 240 (114 C)To resume normal operation after the S.L.OWwarning system has activated, the engine must cool to 20]0 (110 C) and the engine must be turned offThe S.L.OWwarning system depends on input from the port or starboard temperature switch tanblue leadFunctional Test 1Disconnect port and starboard temperature switch tanblue leads2Install correct test propellerStart engine in test tank and run at 3500 RPM
3Touch port engine harness tan lead to clean engine ground Engine speed must gradually slow to approximately 2500 RPM
4Shut off engine5Start engine and repeat Steps and using starboard engine harness tan lead Engine speed must gradually slow to approximately 2500 RPM If Steps and are normal, test temperature switchesRefer to Temperature Switch Test, Section If one of the tests is normal, check engine harness and connectors If neither test is normal, verify condition of wires and connectorsReplace power packINotellf the engine goes into S.L.D.Wrepeatedly or if the engine goes into S.L.D.Wwithout an operator warning signal, check the engine harness blocking diode Refer to Blocking Diode Test