Suzuki AN650 2002 - Fail-Safe Function

FI SYSTEM/ CVT SYSTEM 6-21
FAIL-SAFE FUNCTION
FI system/CVT 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 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
Camshaft position sensor When camshaft position signal has
failed during running, the ECM
determines cylinder as # before
occurrence of such a failure.
“NO”“YES”
Motorcycle can run, but once engine
stops, engine can not start.
Crankshaft position sensor The motorcycle stops. “NO”“NO”
Intake air pressure sensor Intake air pressure is fixed to
760 mmHg.
“YES”“YES”
Throttle position sensor The throttle opening is fixed to full
open position.
Ignition timing is also fixed.
“YES”“YES”
Engine coolant temp.
sensor
Engine coolant temperature value is
fixed to 80 °C.
“YES”“YES”
Intake air temperature
sensor
Intake air temperature value is fixed
to 40 °C.
“YES”“YES”
Atmospheric pressure
sensor
Atmospheric pressure is fixed to
760 mmHg.
“YES”“YES”
Ignition signal #1 (IG coil #1) #1 Ignition-off “YES”“YES”
#2 cylinder can run.
Ignition signal #2 (IG coil #2) #2 Ignition-off “YES”“YES”
#1 cylinder can run.
Injection signal #1 #1 Fuel-cut “YES”“YES”
#2 cylinder can run.
Injection signal #2 #2 Fuel-cut “YES”“YES”
#1 cylinder can run.
HO2 sensor (E-02, 19) Feedback compensation is inhibited.
(Air/fuel ratio is fixed to normal.)
“YES”“YES”
CVT motor Current supply to motor is inter-
rupted.
“YES”“YES”
CVT pulley position sensor Automatic mode: Shifting to manual
mode is inhibited. Reduction ratio is
fixed to an equivalent to 2nd range.
Manual mode: During running on
2nd or higher range, the reduction
ratio is fixed to an equivalent to 2nd
range. If running on 1st range, it is
fixed to 1st range.
All shifting is inhibited.
“YES”“YES”
CVT speed sensor “YES”“YES”
CVT secondary pulley
revolution sensor
“YES”“YES”
CVT engine revolution signal
“YES”“YES”
CVT throttle position signal Throttle position signal is fixed to
30% open.
“YES”“YES”