2009-2010 Suzuki DF70A DF80A DF90A Outboard Service Manual, Page 185Get this manual
Fuel System:
General Description
Electronic Fuel Injection System Description
The fuel injection system used by the DF708090 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, etcZ9J0111701001
Fuel Injection Control System Outline 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 accordinglyIn regards to fuel injection timing, the fuel injection end timing is set depending on engine rpmThe ECM calculates the amount of fuel injection based on the engines operating conditions, and determines the fuel injection start timingIn the injection timing chart below, the injection end timing is set at BTCD on the exhaust stroke