1996 Johnson Evinrude "ED" 9.9 thru 30 2-Cylinder Service Manual, P/N 507122, Page 327Get this manual
Circuit Verification, Instrument Harness To make sure the OMC System CheckTM 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
befDT, performing the following testsVerify the condition of all wiring and connectors before proceeding42811
INote The warning
horn will not sound while in the diagnostic
IT] INote Use jumper wires
System Check Gauge
made with the appropriate terminals to test the warning circuits