2006 Johnson SD 30 HP 4 Stroke Outboards Service Manual, PN 5006592, Page 74Get this manual
ENGINE CONTROL TROUBLESHOOTING
TROUBLESHOOTING
Check the spark conditionI Sparks
Not good
Check the ignition timingJI Not good I
Th cause
'gnition system not'In the I
No or weak sparks
Check the condition of the spark plugOK
Replace the spark plug
Disconnect the emergency stop switch wire (BlueRed or Green)
Check andor replace the emergency stop switch or the ignition switch
No or weak sparks