FI SYSTEM AND INTAKE AIR SYSTEM 4-9
COMPENSATION OF INJECTION TIME (VOLUME)
The following different signals are output from the respective sensors for compensation of the fuel injection
time (volume).
SIGNAL
ATMOSPHERIC PRESSURE SENSOR SIG-
NAL
ENGINE COOLANT TEMPERATURE SEN-
SOR SIGNAL
INTAKE AIR TEMPERATURE SENSOR SIG-
NAL
BATTERY VOLTAGE SIGNAL
ENGINE RPM SIGNAL
STARTING SIGNAL
ACCELERATION SIGNAL/
DECELERATION SIGNAL
DESCRIPTION
When atmospheric pressure is low, the sensor sends the
signal to the ECM and reduce the injection time (volume).
When engine coolant temperature is low, injection time (vol-
ume) is increased.
When intake air temperature is low, injection time (volume)
is increased.
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. This
is the compensation of the SRAD.
When starting engine, additional fuel is injected during crank-
ing engine.
During acceleration, the fuel injection time (volume) is in-
creased, in accordance with the throttle opening speed and
engine rpm. During deceleration, the fuel injection time (vol-
ume) is decreased.
INJECTION STOP CONTROL
SIGNAL
TIP OVER SENSOR SIGNAL
(FUEL SHUT-OFF)
OVER-REV. LIMITER SIGNAL
DESCRIPTION
When the motorcycle tips over, the tip over sensor sends a
signal to the ECM. Then, this signal cuts OFF current sup-
plied to the fuel pump, fuel injectors and ignition coils.
The fuel injectors stop operation when engine rpm reaches
rev. limit rpm.
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