2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 132Get this manual
ENGINE CONTROL SYSTEM
CHART 7: SELF-DIAGNOSTIC CODE "2-2" Air intake system
START Ignition switch "ON" Check throttle position sensor output voltage changeIs result OK? (See page 3-59 YES Ignition switch "OFF" Check MAP sensor, IAC valve for air leakage Check intake manifold for air leakageIs result OK? NO Possible cause: ECM failure YES Air intake system failure NO Throttle position sensor failure