Fail-Safe Function - Suzuki SV650 Supplementary Service Manual

20 SV650K7/SK7/AK7/SAK7 ('07-MODEL)

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
(Front & Rear)
Throttle position sensor
Engine coolant temp. sensor Engine coolant temperature value is
Intake air temperature sensor Intake air temperature value is fixed
Ignition signal #1 (IG coil #1) #1 Ignition-off and #1 Fuel-cut
Ignition signal #2 (IG coil #2) #2 Ignition-off and #2 Fuel-cut
Injection signal #1
Injection signal #2
HO2 sensor
(For E-02, 19, 24, 33)
Secondary throttle valve
actuator
Secondary throttle position
sensor
Gear position signal
PAIR control solenoid valve
ISC 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.
TPS opening value is fixed to full
open position.
fixed to 70 °C.
to 25 °C.
#1 Fuel-cut
#2 Fuel-cut
Feedback compensation is inhibited.
(Air/fuel ratio is fixed to normal.)
Secondary throttle valve is fixed in
any position.
Secondary throttle valve is stopped.
Gear position signal is fixed to 4th
gear.
O2 feedback control is stopped and
PAIR valve is fixed to open position.
When motor disconnection or lock
occurs, ISC valve is stopped.
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"
"YES" "YES"