Suzuki 2003-2007 DF60 DF70 Outboard Motors Service Manual, Page 62Get this manual
ENGINE CONTROL SYSTEM
ELECTRONIC FUEL INJECTION SYSTEM
The fuel injection system used by the DF60DF70 is speed-density, multi-point, sequential, electronic fuel injection typeThe fuel injection system is composed of the fuel line components, air intake components, and components for system control (ECM, sensors, switches, etc
FUEL INJECTION CONTROL SYSTEM
OUTLINE The sensors are mounted at precise locations on the motor to monitor the current conditions of engine operation and send signals to the ECMBased on these signals, the ECM determines the optimum fuel injection time duration (fuel amount), fuel injection timing (multi-point sequential timing) and controls the injector operating signals accordinglyFuel injection start timing is set at BTDC 484 on exhaust stroke constant
Basic sensors MAP sensor: Informs ECM of intake manifold pressureCKP sensor: Informs ECM of engine speed and crankshaft angleCompensating sensors Cylinder temperature sensor: Informs ECM of cylinder temperatureIAT sensor: Informs ECM of intake air temperatureMAP sensor: Informs ECM of barometric pressure at time of engine startingBattery voltage: Constantly monitored by ECMOthers CMP sensor: Informs ECM of camshaft angleCTP switch: Informs ECM of throttle position (openclosed)Neutral switch: Informs ECM of shift position (neutralin-gear)Battery charge coil Rectifierregulator 30A fuse Ignition swith Battery Injector 12 ECM main relay ECM CPU