2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 355Get this manual
Self-diagnosis Code 13 15 18 19 23 28 29 37 39 45 46 44 Normal Incorrect pulser coil signal Incorrect engine temperature sensor signal Incorrect throttle position sensor signal Incorrect battery voltage Incorrect intake air temperature sensor signal Incorrect neutral switch signal Incorrect intake air pressure sensor signal Incorrect idle speed control signal Incorrect oil pressure sensor signal Incorrect shift cut switch signal Incorrect thermoswitch signal Incorrect engine stop switch signal Symptom