Fail-Safe Function - Suzuki DL650K5 Service Manual

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