1998 Johnson Evinrude "EC" 25, 35 HP 3-Cylinder Outboards Service Manual, Page 247Get this manual
Circuit Verification, Instrument Harness To make sure the ONIC 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 proceeding
INote The warning
horn will not sound while in the diagnostic
IT] INote 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