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Electronic fuel injection control
In electronic fuel injection control, the engine ECM calculates the precise air and fuel mixture
required in each combustion chamber depending on the load and engine speed in order to increase
combustion efficiency. The fuel injection amount is controlled by the fuel injector actuation time.
There are 2 types of fuel injection timing control: synchronous fuel injection and asynchronous fuel
injection. According to the engine operating conditions during the control, the control mode switches
automatically between the start-up mode, normal operating mode, and fuel injection cutoff mode. In
addition, a multi-point fuel injection system provides the appropriate fuel injection amount for all
weather conditions. As a result, the outboard motor starts quickly the first time the engine start
switch is turned to START. Also, a fuel injector anti-sticking control has been adopted.
Pulser coil
Cam position sensor
(PORT EX)
Cam position sensor
(PORT IN)
Cam position sensor
(STBD IN)
APS
TPS
Air pressure sensor
Air temperature sensor
Engine temperature sensor
Neutral switch
Engine shut-off switch
Battery
Engine
ECM
Fuel injector
Vapor shut-off
valve
Engine start switch
Electronic control system
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