Yamaha F150B Service Manual

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

2-1TECHFEA Technical features and descriptionElectronic control systemF150B uses engine ECM to control the fuel injection amount and the ignition timing, and to reducethe engine speed in case of over heating and low oil pressure. Dependable startability, stable trollingspeed, sharp acceleration, high output power, improved fuel economy, and low exhaust emissionsare assured by controlling the air-fuel ratio and ignition timing appropriately depending on variousengine operating conditions.Self-diagnosis function is incorporated in F150B. Malfunctions can be detected quickly by runningthe optional diagnostic software to be installed in a personal computer.F150B has fail-safe functions. In the event of a failure related to each sensor and actuator, the fail-safe function works to continue the control using the reference values set by engine ECM, or stopthe engine. It also gives warning to the boat operator of the occurrence of failure by lighting the alertindicator, or activating the alert buzzer.Electronic control module system diagramTPSVaporFilterCanisterFuelFilterHigh-pressurefuel pumpFuel pumps WaterdetectionswitchVaporseparatorIgnition coilFuel injectorISC valveAirIdle Speed ControlFuel ControlIgnition ControlBatteryHour meterTachometer andTrim meterEngineECMPulser coilAir pressure sensorOil pressure sensorEngine temperature sensorAir temperature sensorThermoswitchShift cut switchNeutral switch