2009 Yamaha F40 Outboard Service Manual, Page 36Get this manual
TECH FEA Outline
Technical features and description
Engine control system
The F40H employs an electronically controlled fuel injection systemThe engine ECM determines the optimum ignition timing, the fuel injecting timing and volume, and the idle speed based on the signals transmitted from each sensorBesides, the engine ECM has self-diagnosis function to perform failure diagnosis by using the YDISDigital network system Speed sensor (option) Water pressure sensor (option) Air temperature sensor TPS Air pressure sensor Main relay Thermo sensor Pulser coil Ignition coil Fuel injector Trim sensor