2007 Evinrude E-Tec 75, 90 HP outboards Service Manual, Page 111Get this manual
SYSTEM ANALYSIS SPECIALIZED TEST PROCEDURES Ignition System Output Use the timing light to monitor each spark plug lead for consistent flashThe strobe should indicate one flash per revolutionIntermittent output or multiple flashes per revolution indicate improper ignition controlTest ignition system grounds, primary circuit resistance, and EMM output voltages prior to replacing any components
Engine Monitoring Information
Use the Evinrude Diagnostics Software program to access the engine Monitor screenThis screen display provides engine information as it is occurringCircuits are monitored for actual voltages or the condition of the circuitSwitch and sensor circuits, battery voltage (12 V), system voltage (55 V), and ignition voltage are continuously monitored1