1998 Johnson Evinrude "EC" 90, 115 SPL Service Manual, P/N 520209, Page 253Get 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 missed
INote The instrument harness must be connected to the engine
before performing the following testsVerify the condition of all wiring and connectors before proceeding42811
The warning horn will not sound while in the diagnostic