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
IAP sensor Intake air pressure is fixed to 101.3
kPa (760 mmHg).
“YES” “YES”
TP sensor The throttle opening is fixed to full
open position.
Ignition timing is also fixed.
“YES” “YES”
IAT sensor Intake air temperature value is fixed
to 40 °C (104 °F).
“YES” “YES”
ET sensor Engine temperature value is fixed to
90 °C (194 °F).
“YES” “YES”
HO2 sensor Feedback compensation is inhibited.
(Air/fuel ratio is fixed to normal.)
“YES” “YES”
STV actuator When motor disconnection or lock
occurs, power from ECM is shut off.
“YES” “YES”
STP sensor Secondary throttle valve is fixed to
full open position.
“YES” “YES”
PAIR control solenoid valve ECM stops controlling PAIR control
solenoid valve.
“YES” “YES”
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