Fail-Safe Function - Suzuki VL1500K5 Supplementary 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
IAP sensor
TP sensor
EOT sensor
IAT sensor
Ignition signal
Injection signal
STV actuator
STP sensor
Gear position signal
HO2 sensor
(For E-02, 19, 24)
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.
When two ignition signals or two injector signals are not received by ECM, the fail-safe circuit can not work
and ignition or injection is stopped.
FAIL-SAFE MODE
Intake air pressure is fixed to
760 mmHg.
The throttle opening is fixed to full
open position.
Ignition timing is also fixed.
Engine oil temperature value is fixed
to 80 °C (176 °F).
Intake air temperature value is fixed
to 40 °C (104 °F).
#1 Ignition-off and #1 Fuel-cut
#2 Ignition-off and #2 Fuel-cut
#1 Fuel-cut
#2 Fuel-cut
Secondary throttle valve is fixed in
any position.When motor disconnec-
tion or lock occurs, power from ECM
is shut off.
Secondary throttle valve is fixed in
any position.
Gear position signal is fixed to 5th
gear.
Feedback compensation is inhibited.
(Air/fuel ratio is fixed to normal.)
O2 feedback control is stopped and
PAIR valve is fixed to open position.
VL1500K5 ('05-MODEL)
STARTING RUNNING
ABILITY ABILITY
"YES" "YES"
"YES" "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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