2008 Evinrude E-TEC 55MFE Technical Manual, Page 81Get this manual
ENGINE MANAGEMENT MODULE (EMM) EXTERNAL SENSORS
Engine Temperature Sensor
Monitors cylinder head temperatureThe sensor is negative temperature coefficient thermistor (NTC)If cylinder head temperature exceeds 194 (90 C), the EMM: Interrupts the ignition once per 50 engine revolutions to signal the operator Stores service code 43 EMM LED 4: ON (Running) Engine Monitor TEMP display: ON If cylinder head temperature exceeds 230F (110C), the EMM: Activates S.A.F.EStores service code 31 EMM LED 4: FLASHING Engine Monitor TEMP display: FLASHING If sensor values are below -15F (-26.1C) or above 332F (166.5C), the EMM: Stores service code 41 EMM LED 3: OFF (Cranking) EMM LED 3: ON (Running) If sensor values are below -4F (-20C), the EMM: Stores service code 42 EMM LED 3: OFF (Cranking) EMM LED 3: ON (Running) If engine does not reach operating temperature on cylinder head (104F40C below 2300 RPM) in 10 minutes, the EMM: Stores service code 58 EMM LED 3: OFF (Cranking) EMM LED 3: ON (Running)