Fail-Safe Function - Suzuki GSX1400 Service Manual

4-26 FI SYSTEM

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
Camshaft position ECM determines cylinder as
sensor number before occurrence
of such a failure.
Intake air pressure Intake air pressure is fixed
sensor to 760 mmHg.
Throttle position The throttle opening is
sensor fixed to full open position.
Ignition timing is also fixed.
Engine oil Engine oil temperature
temperature sensor value is fixed to 80°C.
Intake air Intake air temperature
temperature sensor value is fixed to 40°C.
Atmospheric Atmospheric pressure is
pressure sensor fixed to 760 mmHg.
Ignition
#1, #4 #1/#4 Ignition-off
signal
#2, #3 #2/#3 Ignition-off
Injection
#1 #1 Fuel-cut
signal
#2 #2 Fuel-cut
#3 #3 Fuel-cut
#4 #4 Fuel-cut
Secondary throttle Secondary throttle valve is
valve actuator fixed to half open position.
Secondary throttle Secondary throttle valve is
position sensor fixed to half open position.
Gear position signal Gear position signal is fixed
to 6th gear.
"Yes" means that 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 necessary to bring the motorcycle to the workshop for complete repair.
Only for injector signal:
Two injector signals are not received by ECM ("FI" is indicated in the LCD panel), but the fail-safe circuit
works and injection is not stopped.
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FAIL-SAFE MODE STARTING ABILITY
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
#2 & #3 cylinders can run.
"YES"
#1 & #4 cylinders can run.
"YES"
#2, #3 & #4 cylinders can run.
"YES"
#1, #3 & #4 cylinders can run.
"YES"
#1, #2 & #4 cylinders can run.
"YES"
#1, #2 & #3 cylinders can run.
"YES"
"YES"
"YES"
RUNNING ABILITY
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"
"YES"