Engine General Information and Diagnosis: 1A-22
Fail-Safe Function Table
B817H21104007
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.
The engine can start and can run even if the signal in the table 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.
Item Fail-Safe Mode Starting Ability Running Ability
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).
“YES” “YES”
IAT sensor
Intake air temperature value is fixed to 40 °C
(104 °F).
“YES” “YES”
Ignition signal
#1 Fuel-cut
“YES” “YES”
#2, #3 & #4 cylinder can run.
#2 Fuel-cut
“YES” “YES”
#1, #3 & #4 cylinder can run.
#3 Fuel-cut
“YES” “YES”
#1, #2 & #4 cylinder can run.
#4 Fuel-cut
“YES” “YES”
#1, #2 & #3 cylinder can run.
Secondary throttle valve
actuator
When motor disconnection or lock occurs,
power from ECM is shut off.
“YES” “YES”
STP sensor
Secondary throttle valve is fixed to full close
position.
“YES” “YES”
Gear position signal Gear position signal is fixed to 6th gear. “YES” “YES”
HO2 sensor
Feedback compensation is inhibited. (Air/
fuel ratio is fixed to normal.)
“YES” “YES”
PAIR control solenoid valve
ECM stops controlling PAIR control solenoid
valve.
“YES” “YES”
ISC valve
When motor disconnection or lock occurs,
power from ECM is shut off.
“YES” “YES”
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