Suzuki DF150 Service Manual page 79

3-20 ENGINE CONTROL SYSTEM
FUEL INJECTION TIMING CHART
TDC
#1 Cyl.
#3 Cyl.
TDC
#4 Cyl.
#2 Cyl.
CKP
sensor
signal
CMP
sensor #1
signal
CMP
sensor #2
signal (VVT)
#1. injection
signal
#2. injection
signal
#3. injection
signal
#4. injection
signal
Cm.: Compression,
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. This signal is used to compensate the fuel injection map for altitude.
WHEN CRANKING:
Fuel is simultaneously injected to all cylinders according to the "Start up mode" map in relation to crankshaft
angle.
AFTER START (FAST-IDLE FUNCTION):
The fuel injection amount is controlled to remain increased until the timer, set according to cylinder tempera-
ture 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.
Ep.
TDC
Cm.
In.
TDC
Ex.
Injection Start Timing:
ATDC 275˚ on Ex. stroke
Ep.: Explosion, Ex.: Exhaust,
TDC
Ex.
Ep.
TDC
Cm.
In.
Injection time duration
In.: Intake, TDC: Top Dead Center
In. Cm.
TDC
Ex. In.
Ep. Ex.
TDC
Cm. Ep.