2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 234Get this manual
TRBL SHTG
Troubleshooting
4If flash pattern listed in the diagnostic code chart is displayed, check the malfunctioning part according to the flash patternNOTE: When more than one problem is detected, the light of the special service tool flashes in the pattern of the lowest numbered problemAfter that problem is corrected, the light flashes in the pattern of the next lowest numbered problemThis continues until all of the problems are detected and correctedCode 13 15 18 19 23 28 29 37 44 49 59 Normal Incorrect pulser coil signal Incorrect cooling water temperature sensor signal Incorrect throttle position sensor signal Incorrect battery voltage Incorrect sensor assembly (intake air temperature) signal Incorrect shift position switch signal Incorrect sensor assembly (intake air pressure) signal Incorrect idle speed control signal Incorrect engine stop lanyard switch signal Over cool signal Incorrect memory data signal Symptom