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FI SYSTEM DIAGNOSIS 4-21
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
CMP sensor When camshaft position signal has
failed during running, the ECM
determines the cylinder positions as
# to be the same as before occur-
rence of such a failure.
“NO” “YES”
Motorcycle can run, but once engine
stops, engine can not start.
IAP sensor Intake air pressure is fixed to 101
kPa (760 mmHg).
“YES” “YES”
TP sensor The throttle opening is fixed to full
open position.
Ignition timing is also fixed.
“YES” “YES”
ECT sensor Engine coolant temperature value is
fixed to 80 °C (176 °F).
Cooling fan is fixed on position.
“YES” “YES”
IAT sensor Intake air temperature value is fixed
to 40 °C (104 °F).
“YES” “YES”
AP sensor Atmospheric pressure is fixed to 101
kPa (760 mmHg).
“YES” “YES”
Ignition signal #1 Ignition-off “YES” “YES”
#2, #3 & #4 cylinders can run.
#2 Ignition-off “YES” “YES”
#1, #3 & #4 cylinders can run.
#3 Ignition-off “YES” “YES”
#1, #2 & #4 cylinders can run.
#4 Ignition-off “YES” “YES”
#1, #2 & #3 cylinders can run.
Primary injection signal #1 Fuel-cut (primary side) “YES” “YES”
#2, #3 & #4 cylinders can run.
#2 Fuel-cut (primary side) “YES” “YES”
#1, #3 & #4 cylinders can run.
#3 Fuel-cut (primary side) “YES” “YES”
#1, #2 & #4 cylinders can run.
#4 Fuel-cut (primary side) “YES” “YES”
#1, #2 & #3 cylinders can run.