1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 139Get this manual
6 (15 incm)
DRC6251
S.L.DWarning System
This ignition system incorporates the SLOWTM warning system, which gradually limits engine speed to approximately 2500 RPM when engine temperature exceeds 1800 (82 C)To resume normal operation after the SLOWwarning system has activated, the engine must cool to 1550 (680 C) and the engine must be turned offThe SLOINwarning system depends on input from the port or starboard temperature switch tanred lead
Functional Test
1Disconnect port and starboard temperature switch tanred 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 pack