Suzuki DF200/DF225/DF250 V6 4-Stroke Outboards Service Manual, Page 75Get this manual
ENGINE CONTROL SYSTEM
SPS (Shift Position Sensor) The SPS is installed on the throttle lever holder and detects the shift position with the clutch lever operation interlockedThis sensor is variable resistor that changes resistance (ohms) in accordance with the shift positionThe varying resistance value is converted to voltage and input to the ECMBased on the SPS voltage, the ECM calculates and determines the change of shift position and executes the following controls When the shift is in neutral, fuel injection is controlled to prevent engine speed from exceeding 000 rmin After shifting into forward or reverse from neutral, the IAC valve is controlled to increase intake air for 0.1 second to prevent unstable engine idle or stalling
Shift position sensor
ECM MAIN RELAY The ECM main relay is installed in the electric parts holderWhen energized by turning the ignition switch ON, circuit is formed which supplies battery voltage to the ECM, fuel injector, ignition coil, IAC valve, CMP sensor, highlow pressure fuel pump, purge valve, OCV (Oil control valve) and VSV (Vacuum switching valve)