FI SYSTEM DIAGNOSIS 4-11
COMPENSATION OF INJECTION TIME (VOLUME)
The following different signals are output from the respective sensors for compensation of the fuel injection
time (volume).
INJECTION STOP CONTROL
SIGNAL
DESCRIPTION
ENGINE COOLANT TEMPERATURE SEN-
SOR SIGNAL
When engine coolant temperature is low, injection time (vol-
ume) is increased.
INTAKE AIR TEMPERATURE SENSOR
SIGNAL
When intake air temperature is low, injection time (volume)
is increased.
HEATED OXYGEN SENSOR SIGNAL
Air/fuel ratio is compensated to the theoretical ratio from
density of oxygen in exhaust gas. 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.
BATTERY VOLTAGE SIGNAL
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.
ENGINE SPEED SIGNAL
At high speed, the injection time (volume) is increased.
STARTING SIGNAL
When starting engine, additional fuel is injected during
cranking engine.
ACCELERATION SIGNAL/
DECELERATION SIGNAL
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 (vol-
ume) is decreased.
SIGNAL
DESCRIPTION
TIP-OVER SENSOR SIGNAL
(FUEL SHUT-OFF)
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.
OVER-REV. LIMITER SIGNAL
The fuel injectors stop 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 11 400 r/min, this circuit cuts off fuel at the fuel
injectors. But under no load, the clutch lever is pulled or the
gear position is in neutral, this circuit cuts off fuel when
engine speed reaches 10 800 r/min.
Under no load, the engine can run over 11 000 r/min
through 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.
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