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FI
SYSTEM
DIAGNOSIS
4·19
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 RUNNING
ABILITY ABILITY
Camshaft position sensor
When camshaft position signal has
"NO" "YES"
failed during running, the ECM
Motorcycle can run, but once engine
determines cylinder as # before
stops, engine can not start.
occurrence of such a failure.
Crankshaft position sensor The motorcycle stops. "NO" "NO"
Intake air pressure sensor Intake air pressure is fixed to 760
"YES" "YES"
mmHg.
Throttle position sensor The throttle opening is fixed to full
open position.
"YES" "YES"
Ignition timing is also fixed.
Engine coolant temperature Engine coolant temperature value is
"YES" "YES"
sensor
fixed to
80°C
(176
OF).
Intake air temperature Intake air temperature value is fixed
"YES" "YES"
sensor
to 40 °C (104
OF).
Atmospheric pressure Atmospheric pressure is fixed to 760
"YES" "YES"
sensor mmHg.
Ignition signal #1 Ignition-off "YES" "YES"
#2, #3 & #4 cylinders can run.
#2 Ignition-off "YES"
"YES"
#1, #3  cylinders can run.
#3 Ignition-off
"YES" "YES"
#1, #2  cylinders can run.
#4 Ignition-off
"YES" "YES"
#1, #2 & #3 cylinders can run.
Injection signal #1 Fuel-cut "YES" "YES"
#2, #3 & #4 cylinders can run.
#2 Fuel-cut "YES" "YES"
#1, #3  cylinders can run.
#3 Fuel-cut "YES" "YES"
#1, #2  cylinders can run.
#4 Fuel-cut "YES" "YES"
#1, #2 & #3 cylinders can run.