FI SYSTEM AND INTAKE AIR SYSTEM 4-29
FAIL-SAFE FUNCTION
FI system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a
minimum performance necessary even under malfunction condition.
ITEM
Camshaft position
sensor
Crankshaft position
sensor
Intake air pressure
sensor
Throttle position
sensor
Engine coolant tem-
perature sensor
Intake air tempera-
ture sensor
Atmospheric
pressure sensor
Ignition
#1
signal
#2
#3
#4
Injection
#1
signal
#2
#3
#4
Secondary throttle
valve actuator
Gear position signal
STARTING ABILITY RUNNING ABILITY
“NO”“YES”
Motorcycle can run, but once engine stops, engine can
not start.
“NO”“NO”
“YES”“YES”
“YES”“YES”
“YES”“YES”
“YES”“YES”
“YES”“YES”
“YES”“YES”
#2, #3 & #4 cylinders can run.
“YES”“YES”
#1, #3 & #4 cylinders can run.
“YES”“YES”
#1, #2 & #4 cylinders can run.
“YES”“YES”
#1, #2 & #3 cylinders can run.
“YES”“YES”
#2, #3 & #4 cylinders can run.
“YES”“YES”
#1, #3 & #4 cylinders can run.
“YES”“YES”
#1, #2 & #4 cylinders can run.
“YES”“YES”
#1, #2 & #3 cylinders can run.
“YES”“YES”
“YES”“YES”
“Yes” means that the engine can start and can run even if the above signal is not received from each sensor.
But, the engine running condition is not complete, providing only emergency help (by fail-safe circuit). In this
case, it is necessary to bring the motorcycle to the workshop for complete repair.
When two ignition signals or two injector signals are not received by ECM, the fail-safe circuit can not work
and ignition or injection is stopped.
FAIL-SAFE MODE
When camshaft position
signal has failed during run-
ning, the ECM determines
cylinder as # before occur-
rence of such a failure.
The motorcycle stops.
Intake air pressure is fixed
to 760 mmHg.
The throttle opening is fixed
to full open position.
Ignition timing is also fixed.
Engine coolant temperature
value is fixed to 80°C.
Intake air temperature value
is fixed to 40°C.
Atmospheric pressure is
fixed to 760 mmHg.
#1 Ignition-off
#2 Ignition-off
#3 Ignition-off
#4 Ignition-off
#1 Fuel-cut
#2 Fuel-cut
#3 Fuel-cut
#4 Fuel-cut
Secondary throttle valve is
fixed to full open position.
Gear position signal is fixed
to 6th gear.
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