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2) Start Up Fuel Mapping
When the engine is started (cranked), the amount of fuel injected by each cylinder is increased from the normal
quantity to improve the starting performance.
In addition, the block temperature and other information is obtained from the various sensors and corrected to the
optimum condition.
3) Acceleration Fuel Mapping
When the change in the throttle opening exceeds a certain set value, the ECU determines that the engine revolution
speed is being increased and so it increases the fuel injection amount.
4) Deceleration Fuel Mapping
When the change in the throttle opening exceeds a certain set value, the ECU determines that the engine revolution
speed is being decreased and so it decreases the fuel injection amount.
5) Correction Based On Intake Air Temperature
The ECU adjusts and corrects the fuel injection amount relative to the manifold intake air temperature, which differs
greatly depending on the outboard motor operating conditions and whether the engine is cold or warm.
6) Engine Temperature Correction
Similar to the correction upon startup, the block temperature and other information is obtained from the various
sensors and corrected to the optimum condition.
(4) Control of Fuel Feed Pump (FFP)
During normal operation : ECU performs on/off control for fuel feed pump (FFP) by using output signal from its pump
At starting
When stopped
(5) Control of Tachometer
ECU performs on/off control for tachometer by using pulse input signal (On-off signal).
Pulse output rate is 6 pulses per crank revolution (12 poles).
When using accessory tachometer, set selector switch to 12 P (poles).
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control circuit.
: Pump control circuit outputs a signal to the pump (FFP), and power is supplied to the DC
motor to drive the pump (FFP).
: Power supply to the motor is shut off and the pump (FFP) stops.
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