Suzuki DF 60 Service Manual page 63

FUEL INJECTION TIMING CHART
• The fuel injection timing is always fixed at BTDC 484° on exhaust stroke.
• The fuel ignition time duration (amount) is varied by the condition of the engine running.
• Angles indicated in the following chart show the CRANKSHAFT angle.
34-signals/360˚
10˚
CKP sensor
signal
CMP sensor
signal
ON
#1 Injection
OFF
signal
In.
#3 Injection
signal
Ex.
#4 Injection
signal
Ep.
#2 Injection
signal
Cm.
In. : Intake, 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, 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.
30˚
120˚ 120˚
4-signals/720˚
BTDC 484˚ on exhaust stroke
Cm. Ep.
TDC
In. Cm.
TDC TDC
Ex. In.
TDC
Ep. Ex.
TDC TDC
ENGINE CONTROL SYSTEM
120˚
Ex. In. Cm.
TDC
Ep. Ex. In.
TDC
Cm. Ep. Ex.
TDC
In. Cm. Ep.
TDC
Ep. : Explosion, Ex. : Exhaust,
Injection time duration
Ep. Ex.
TDC TDC
Cm. Ep.
TDC
In. Cm.
TDC TDC
Ex. In.
TDC
TDC : Top Dead Center
3-15
In.
Ex.
Ep.
Cm.