2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 233Get this manual
Electrical systemsSelf-diagnosis
Self-diagnosis
Diagnosing the electronic control system
1Connect the special service tool to the outboard motor as shown
Trouble code indication Example: The illustration code number 23a: Light on, 0.33 second b: Light off, 4.95 seconds c: Light off, 0.33 second d: Light off, 1.65 seconds
indicates