Fail-Safe Function - Suzuki DL650 Service Manual

FI SYSTEM DI A GNOSI S 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.
ITEM
lntake air pressure sensor
Throttle position sensor
I
lgnition timing is also fixed.
I
FAIL-SAFE MODE
full open position, and STV is fixed
at 112 open position.
lntake air pressure and atmospheric
pressure are fixed to 760 mmHg.
The throttle opening signal is fixed to
"NO"
I
STARTI NG
ABILITY
I
Engine coolant temperature
sensor
Intake air temperature
sensor
Ignition signal
#1
Injection signal
RUNNING
ABILITY
-
"YES"
#2
-
"YES"
Engine coolant temperature value is
fixed to 80 "C (176 OF).
Intake air temperature value is fixed
to 40 "C (104 OF).
#1 Fuel cut
#2 Fuel cut
"YES"
"YES"
"YES"
"YES"
"YES"
#2
(
"YES"
1
YES"
I
"YES"
"YES"
"YES"
"YES"
#2
cvlinder can run.
I
Secondary throttle valve
actuator
#2 cylinder can run.
"YES"
#2 Fuel-cut
ECM stops controlling STV.
I
"YES"
I
"YES"
I
# I cylinder can run.
I
Secondary throttle position
sensor
"YES"
ECM stops controlling STV.
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.
"YES
Gear position signal
Heated oxygen sensor
(E-02, 19)
PAIR control solenoid valve
I
# I cvlinder can run.
Gear position signal is fixed to 4th
gear.
Fuel-air compensation ratio is fixed
to normal condition.
ECM stops controlling PAIR control
solenoid valve.
"YES"
"YES"
"YES"
"Y ES"
"YES"
"YES"