2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 88Get this manual
ENGINE CONTROL SYSTEM
SYSTEM OPERATION
This system is operated by the vacuum created during engine operation and controlled by the ECMTo operate the system (openclose the shut off valve to change the intake tract), the intake manifold, check valve, vacuum tank, VSV and depression chamber are connected with hoses as shown in the illustrationA rod is used to connect the shut off valve and depression chamber for opening and closing the valve2 1Intake manifold 2Throttle body 3VSV 4Check valve 5Depression chamber 6Vacuum tank 3