Yamaha F150B Service Manual

Also see for F150B: Owner's manual Service manual Owner's manual

4-11TRBLSHTG TroubleshootingTroubleshooting the power unit (trouble code not detected)Troubleshooting when a trouble code is not available consists of the following 4 items.Symptom 1: Specific trouble conditions.Symptom 2: Trouble conditions of an area or individual part.Cause 1: The content considered as the trouble factors of symptom 2.Cause 2: The content considered as the trouble causes of cause 1 (described if necessary).— : Not applicableSymptom 1: Engine does not crank.Symptom 2 Cause 1 Cause 2 Checking step Refer topageStarter motor does notoperateBlown fuse — Check the fuse. 5-2A-7Starter relay malfunction — Check the starter relay. 5-38Engine start switch malfunction — Check the engine start switch. 5-39Neutral switch malfunction — Check the neutral switch (remote control). 5-39Short, open, or loose connection in startermotor circuit —Check the starter relay input voltage. 5-38A-7Check the wiring harness continuity. A-7Starter motor malfunction — Disassemble and check the starter motor. 5-43Starter motor operates,but the engine does notcrankStarter motor malfunction Clutch assembly malfunc-tionDisassemble and check the starter motor. 5-43Magnet switch malfunctionStuck piston—Disassemble and check the power unit. 7-367-45Piston lock due to water or oil in the combus-tion chamberSalt buildup on the drive shaft and bushing — Disassemble and check the upper case. 9-16