Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 68Get this manual
ENGINE CONTROL SYSTEM
AIR INTAKE COMPONENTS
Air, after entering through the silencer, passes through the throttle body and flows into the surge tank where it is then distributed to the cylinder intake manifoldIntake manifold pressure, monitored by the MAP sensor, is an indirect measure of the intake air amountWhen the throttle is fully closed, the main supply of intake manifold air necessary to sustain the engine idle passes through the by-pass air passageTo maintain the engine idle speed at the specification, the ECM controlled the IAC valve supplies regulated amount of additional air through the IAC (idle air control) passageAIR FLOW
Intake manifold IAC valve silencer IAC passage