TOHATSU BFT250A Service Manual page 624

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TECHNICAL FEATURES
CHARGE OUTPUT ENHANCEMENT WHEN IDLING
GENERAL
Detecting electrical loads in the outboard motor when idling, the engine idle speed is enhanced when the electrical loads are high to
increase charging capacity to allow for use of more electrical power in the outboard motor. (Only when in neutral)
CONSTRUCTION AND FEATURES
The ECM detects ACGF output (ACGF load condition output) from the alternator and computes current electrical loads in the
outboard motor.
When a large electrical load is identified, the ECM controls the ignition timing, fuel injection and EACV, and enhances the engine
-1
idle speed from 650 min (rpm) to 750 min
ALTERNATOR
21-4
-1
(rpm).
ENGINE SPEED
NEUTRAL POSITION
ACGF output
Power supply to system
BATTERY
User load
(Boat equipment)
60
50
40
30
20
10
0
550 600 650 700
ENGINE SPEED (min
ECM
Electrical load
condition
computation
Idle speed
determination
Target idle
speed control
750 800 850 900
-1 (rpm))
Ignition
Fuel injection
EACV
950 1000 1050