1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 300Get this manual
Circuit Verification, Instrument Harness To make sure the OMC System Check engine monitor can alert the operator during LOW OIL, NO OIL, FUEL RESTRICTION, or engine OVERHEAT condition, it is very important to verify the condition of the sensors and associated wiringTest the engine monitor regularly and anytime you suspect an alert situation has been missedINotel The instrument harness must be connected to the engine before performing the following testsVerify the condition of all wiring and connectors before proceedingINotel The warning horn will not sound while in the diagnostic mode
INotel Use jumper wires made with the appropriate terminals to test the warning circuits
System Check Gauge
1Turn the key switch to ON position, engine not running The gauge warning lights for NO OIL, WATER TEMP, CHECK ENGINE, and LOW OIL must all light at once, then turn off in sequence, and the warning horn must sound for 12 second