2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 266Get this manual
Troubleshooting the power unit Symptom 1: Engine does not crank (electric starter model) Symptom Starter motor does not operate Cause Shift lever or remote control lever not in the neutral position Blown fuse Engine start button or engine start switch malfunction Neutral switch malfunction Starter relay malfunction Short, open, or loose connection in starter motor circuit Starter motor malfunction Starter motor operates, but the engine does not crank Stuck piston Piston lock due to water or oil in the combustion chamber Stuck drive shaft Cause Checking step Set the shift lever or remote control lever to the neutral positionCheck the fuseCheck the engine start button or engine start switchCheck the neutral switchCheck the starter relayCheck the wiring harness continuityDisassemble and check the starter motorDisassemble and check the power unitRefer to page 3-9 3-10