1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 253Get this manual
Circuit Verification, Instrument Harness To make sure the OVIC 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
NoID!OIL WATERfMTEMP
INotel Use jumper wires made with the appropriate terminals to test the warning circuits
ill ENGINE