Suzuki DF70A Service Manual page 186

1G-3 Fuel System:
Fuel Injection Timing Chart
CKP sensor
signal
140°
CMP sensor
signal
No.1 cylinder Cm.
No.3 cylinder In.
Ex.
No.4 cylinder
Ep.
No.2 cylinder
Injection end timing: 0° BTDC on Ex.stroke
No.1 Injection
signal
No.3 Injection
signal
No.4 Injection
signal
No.2 Injection
signal
Fuel Injection Control Mode
When cranking:
Fuel is injected in each cylinders according to the "Start up mode" map which is based on the cylinder temperature and
intake air temperature (sequential injection).
After start (Fast-idle function):
The fuel injection amount is controlled so that the engine rpm stays within the fast idle speed map until the cylinder
temperature reaches normal operating temperature.
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.
32 signals / crankshaft 1 rotation
220°
CMP sensor - 6 signals / 720° (crankshaft 2 rotation)
Ep. Ex.
TDC
Cm. Ep.
In. Cm.
TDC
Ex. In.
Cm.: Compression, Ep.: Explosion, Ex.: Exhaust, In.: Intake,
40°
180° 100°
TDC
In.
TDC
Ex.
TDC
Ep.
TDC
Cm.
Injection time duration
40°
140°
TDC
Cm. Ep.
In. Cm.
TDC
Ex. In.
Ep. Ex.
I9J011170002-05