1997 Johnson Evinrude "EU" 90, 105RW, 115, 150, 150W, 175 60 LV Service Manual, P/N 507268, Page 134Get this manual
STEPTIMING SENSOR TEST
Sources of intense light can disrupt the optical ignition sensor, causing misfireAvoid running the engine in bright sunlight while the timing wheel cover is removedDo not point timing light directly at the sensor1Remove the rectifierregulator cover2Disconnect the timing sensor plug
3Attach OMC Ignition Analyzer to timing sensor and to 12-volt source4Move analyzer selector switch to position:
rn 5Press "RESET" button on analyzer6Crank engine continuously for minimum of three revolutions7Observe meter: If "GOOD" indicator light flashes during cranking, proceed to next step indicated in Troubleshooting Sequence Chart, Page 3-24 If "BAD" indicator light flashes during cranking or the "GOOD" and "BAD" indicator lights alternately flash, check condition of timing wheel or replace timing sensor8Complete all circuits disconnected during this test