2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 191Get this manual
Fuel System:
Control Modes Before start: For seconds after the ignition switch is turned "ON", the fuel pump is controlled to operate at 100 duty cycle to initially pressurize the high pressure fuel lineWhen cranking: The fuel pump is controlled to operate at 50 100 duty cycleThe duty cycle changes depending on cylinder temperatureWhen running (normal operation): The fuel pump is controlled to operate at 50 100 duty cycle based on the current engine speed and battery voltage
Air Intake Components Description
Air, after entering through the silencer case, passes through the throttle body and flows into the surge tank where it is then distributed to the intake manifoldIntake manifold pressure, monitored by the MAP sensor, is an indirect measurement of the intake air amountWhen the throttle is fully closed, the main supply of intake manifold air necessary to sustain engine idle passes through the by-pass air passageTo maintain engine idle speed at specification, the ECM controlled IAC valve supplies regulated amount of additional air through the IAC (Idle Air Control) passage