2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 102Get this manual
ENGINE MANAGEMENT MODULE (EMM) SYSTEMCHECK ENGINE MONITOR The system logic is provided by microprocessor in the gaugeThe microprocessor connects to the EMM and the oil level sending unit of the oil tankRefer to the EMM Service Code Chart located at the back of this manual for detailed list of service codes related to SystemCheck activationThe EMM will activate the warning horn and the appropriate LED on the gauge as follows: NO OIL light indicates an oil delivery problem such as an empty oil tank or damaged oil system components WATER TEMP or HOT light indicates an engine or EMM overheat condition CHECK ENGINE light is used to indicate numerous fault conditions identified by EMMThe oil tank sending unit will activate the warning horn and the LOW OIL LED of the gauge LOW OIL light indicates the oil level in the oil tank is down to the reserve level (about 14 full)
Service Mode
SystemCheck goes into service mode if the key is left ON after self-test (engine NOT running)All light circuits and sensors are active, but the horn is notGrounding the appropriate light circuit wire will turn the light on, but the horn will not sound