FI SYSTEM DIAGNOSIS 4-17
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.
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 nec-
essary to bring the motorcycle to the workshop for complete repair.
ITEM FAIL-SAFE MODE
STARTING
ABILITY
RUNNING
ABILITY
Intake air pressure sensor Intake air pressure and atmospheric
pressure are fixed to 760 mmHg.
“YES” “YES”
Throttle position sensor The throttle opening signal is fixed to
full open position, and STV is fixed
at 1/2 open position.
Ignition timing is also fixed.
“NO” “YES”
Engine coolant temperature
sensor
Engine coolant temperature value is
fixed to 80 °C (176 °F).
“YES” “YES”
Intake air temperature
sensor
Intake air temperature value is fixed
to 40 °C (104 °F).
“YES” “YES”
Ignition signal
#1 #1 Fuel cut
“YES” “YES”
#2 cylinder can run.
#2 #2 Fuel cut
“YES” “YES”
#1 cylinder can run.
Injection signal
#1 #1 Fuel-cut
“YES” “YES”
#2 cylinder can run.
#2 #2 Fuel-cut
“YES” “YES”
#1 cylinder can run.
Secondary throttle valve
actuator
ECM stops controlling STV.
“YES” “YES”
Secondary throttle position
sensor
ECM stops controlling STV.
“YES” “YES”
Gear position signal Gear position signal is fixed to 4th
gear.
“YES” “YES”
Heated oxygen sensor
(E-02, 19)
Fuel-air compensation ratio is fixed
to normal condition.
“YES” “YES”
PAIR control solenoid valve ECM stops controlling PAIR control
solenoid valve.
“YES” “YES”
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