4-26 FI SYSTEM
FAIL-SAFE FUNCTION
FI system is provided with fail-safe function to allow the engine to start and the motorcycle to run in a mini-
mum performance necessary even under malfunction condition.
ITEM FAIL-SAFE MODE STARTING ABILITY RUNNING ABILITY
Camshaft position
ECM determines cylinder as
sensor number before occurrence “YES”“YES”
of such a failure.
Intake air pressure Intake air pressure is fixed
“YES”“YES”
sensor to 760 mmHg.
Throttle position The throttle opening is
sensor fixed to full open position. “YES”“YES”
Ignition timing is also fixed.
Engine oil
Engine oil temperature
“YES”“YES”
temperature sensor value is fixed to 80°C.
Intake air Intake air temperature
“YES”“YES”
temperature sensor value is fixed to 40°C.
Atmospheric Atmospheric pressure is
“YES”“YES”
pressure sensor fixed to 760 mmHg.
Ignition
#1, #4 #1/#4 Ignition-off
“YES”“YES”
signal #2 & #3 cylinders can run.
#2, #3 #2/#3 Ignition-off
“YES”“YES”
#1 & #4 cylinders can run.
Injection
#1 #1 Fuel-cut
“YES”“YES”
signal #2, #3 & #4 cylinders can run.
#2 #2 Fuel-cut
“YES”“YES”
#1, #3 & #4 cylinders can run.
#3 #3 Fuel-cut
“YES”“YES”
#1, #2 & #4 cylinders can run.
#4 #4 Fuel-cut
“YES”“YES”
#1, #2 & #3 cylinders can run.
Secondary throttle Secondary throttle valve is
“YES”“YES”
valve actuator fixed to half open position.
Secondary throttle Secondary throttle valve is
“YES”“YES”
position sensor fixed to half open position.
Gear position signal Gear position signal is fixed
“YES”“YES”
to 6th gear.
“Ye s ” 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.
Only for injector signal:
Two injector signals are not received by ECM (“FI” is indicated in the LCD panel), but the fail-safe circuit
works and injection is not stopped.
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