Suzuki SFV650 Service Manual page 65

Compensation of Injection Time (Volume)
The following different signals are output from the respective sensors for compensation of the fuel injection time
(volume).
Signal
ENGINE COOLANT TEMPERATURE SENSOR
SIGNAL
INTAKE AIR TEMPERATURE SENSOR SIGNAL
HEATED OXYGEN SENSOR SIGNAL
BATTERY VOLTAGE SIGNAL
ENGINE RPM SIGNAL
STARTING SIGNAL
ACCELERATION SIGNAL/DECELERATION
SIGNAL
Injection Stop Control
Signal
TIP-OVER SENSOR SIGNAL (FUEL SHUT-OFF)
OVER-REV. LIMITER SIGNAL
Engine General Information and Diagnosis:
When engine coolant temperature is low, injection time (volume)
is increased.
When intake air temperature is low, injection time (volume) is
increased.
Air/fuel ratio is compensated to the theoretical ratio from density
of oxygen in exhaust gasses. The compensation occurs in such a
way that more fuel is supplied if detected air/fuel ratio is lean and
less fuel is supplied if it is rich.
ECM operates on the battery voltage and at the same time, it
monitors the voltage signal for compensation of the fuel injection
time (volume). A longer injection time is needed to adjust injection
volume in the case of low voltage.
At high speed, the injection time (volume) is increased.
When starting engine, additional fuel is injected during cranking
engine.
During acceleration, the fuel injection time (volume) is increased,
in accordance with the throttle opening speed and engine rpm.
During deceleration, the fuel injection time (volume) is decreased.
When the motorcycle tips over, the tip-over sensor sends a signal
to the ECM. Then, this signal cuts OFF current supplied to the fuel
pump, fuel injectors and ignition coils.
The fuel injector stops operation when engine rpm reaches rev.
limit rpm.
The fuel cut-off circuit is incorporated in this ECM in order to
prevent over-running of engine. When engine speed reaches 10
200 r/min, this circuit cuts off fuel at the fuel injector. But under no
load, the clutch lever is pulled or the gear position is neutral, this
circuit cuts off fuel when engine speed reaches 10 200 r/min.
CAUTION
!
Under no load, the engine can run over 11 000 r/min
though the fuel cut-off circuit is effective, which may
possibly cause engine damage. Do not run the engine
without load over 11 000 r/min at anytime.
Descriptions
Descriptions
1A-2