ENGINE CONTROL SYSTEM 3-14
CONTROL MODE
BEFORE START :
When the ignition switch is turned “ON”, the ECM receives a MAP sensor signal, indicating the static baro-
metric pressure of the intake manifold, which is used to compensate the fuel injection map for altitude.
WHEN CRANKING :
Fuel is simultaneously injected to all cylinders every time any piston is positioned at compression stroke.
AFTER START (FAST-IDLE FUNCTION):
The fuel injection amount is controlled to increase until the timer, set according to cylinder temperature at
the time of engine start, expires.
WHEN IDLING / TROLLING :
The fuel injection amount is controlled to maintain a stable engine speed at the specified idle / trolling rpm.
WHEN ACCELERATING :
The fuel injection amount is controlled to increase.
WHEN DECELERATING :
The fuel injection amount is controlled to decrease.
The fuel injection is also cut off on very rapid engine deceleration.
FUEL INJECTION TIMING CHART
CKP Sensor Signal 1
CKP Sensor Signal 2
CKP Sensor Signal 3
CMP Sensor Signal
#1 Injection Signal
#3 Injection Signal
#2 Injection Signal
In.: Intake, Cm.: Compression, Ep.: Explosion Ex.: Exhaust
BTDC 65° on #1 exhaust stroke
120°
120° 120°
60°
30°
ON
OFF
Injection time duration
TDC TDC
TDC
TDC
TDC
TDC TDC
TDC
TDC
TDC TDC
TDC
TDC
TDC
TDC TDC
TDC
In. Cm. Ep. Ex. In.
Cm.
Ep.
Ex.
In.
Cm.
Ep.
Ex.
Cm.
In.
Ex.
In.
Cm. Ep.
Ex.
In.
Cm.
Ep.
Ex.
Ep.
Cm.
Ep.
Ex.
In.
Cm.
Ep.
Ex.
In.
Cm.
Ep.
Ex. In.
120°
BTDC 545° on #1
exhaust stroke
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