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7-4
FUEL INJECTION SYSTEM
FI
EAS00902
ALTERNATE INSTRUCTIONS OPERATION CONTROL (FAIL-SAFE ACTION)
If the ECU detects an abnormal signal from a sensor while the vehicle is being driven, the ECU illumi-
nates the engine trouble warning light and provides the engine with alternate operating instructions
that are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that are
programmed for each sensor in order to provide the engine with alternate operating instructions that
enable the engine to continue to operate or stop operating, depending on the conditions.
The ECU takes fail-safe actions in two ways: one in which the sensor output is set to a prescribed value,
and the other in which the ECU directly operates an actuator. Details on the fail-safe actions are given
in the table below.
FAIL-SAFE ACTIONS TABLE
Fault
Code No.
Item Symptom Fail-safe action
Engine
startability
Vehicle
drivability
11
Cylinder identification
sensor
No normal signals from the cylinder
identification sensor are received when
the engine is started or while the motor
cycle travels.
Continues to operate the engine based
on the results of the cylinder
identification that existed up to that
point.
Unable Able
12
Crankshaft position
sensor
No normal signals are received from
the crankshaft position sensor.
S Stops the engine (by stopping the
injection and ignition).
Unable Unable
13
14
Intake air pressure
sensor (open or short
circuit) (pipe system)
Intake air pressure sensor-open or
short circuit detected.
Faulty intake air pressure sensor
system.
S Fixes the intake air pressure to
760 mmHg.
Able Able
15
16
Throttle position sensor
(open or short circuit)
(stuck)
Throttle position sensor-open or short
circuit detected.
S Fixes the throttle position sensor to
fully open.
Able Able
19
Sidestand switch (open
circuit in wire to ECU)
Open circuit is detected in the input
line from the sidestand switch to the
ECU.
-- (No start)
Unable Unable
20
Intake air pressure sen-
sor or Atmospheric pres-
sure sensor
When the main switch is turned to ON,
the atmospheric sensor voltage and in-
take air pressure sensor voltage differ
greatly.
S Fixes the intake air pressure and
atmospheric pressure to 760 mmHg.
Able Able
21
Coolant temperature
sensor
Coolant temperature sensor-open or
short circuit detected.
S Fixes the coolant temperature to
60_C.
Able Able
22
Intake temperature
sensor
Intake temperature sensor-open or
short circuit detected.
S Fixes the intake temperature to 20_C.
Able Able
23
Atmospheric pressure
sensor
Atmospheric pressure sensor-open or
short circuit detected.
S Fixes the atmospheric pressure to
760 mmHg.
Able Able
33
34
35
36
Faulty ignition Open circuit detected in the primary
lead of the ignition coil.
S Cut the injection of other cylinder in
the same group with the cylinder that
the error is detected. (Example: when
the #1 cylinder is defective cut the in-
jection of #1 and #4 cylinders)
S Turn on the power to the air induction
solenoid to always cut-off the air.
Able
(depending
on the num-
ber of faulty
cylinders)
Able
(depending
on the num-
ber of faulty
cylinders)
30
41
Lean angle cut-off
switch (latch up
detected) (open or short
circuit)
The motorcycle has over turned.
Lean angle cut-off switch-open or short
circuit detected.
S Turns OFF the fuel injection system
relay of the fuel system.
Unable Unable
42
Speed sensor, neutral
switch
No normal signals are received from the
speed sensor; or, an open or short
circuit is detected in the neutral switch.
S Fixes the gear to the top gear.
Able Able
43
Fuel system voltage
(monitor voltage)
Supply power to the injector and fuel
pump is not normal.
S Fixes the battery voltage to 12 V. Depending
on the mal-
function
case.
Depending
on the mal-
function
case.
44
Error in writing the
amount of CO
adjustment on
EEPROM
An error is detected while reading or
writing on EEPROM (CO adjustment
value).
--
Able Able
46
Vehicle system power
supply (Monitor voltage)
Power supply to the FI system relay is
not normal
--
Unable Able
50
ECU internal
malfunction (memory
check error)
Faulty ECU memory. When this
malfunction is detected, the code
number might not appear on the meter.
S Shut down all functions except the
communication with the meter.
Unable Unable
—
Start unable warning Relay is not turned ON even if the crank
signal is input while the start switch is
turned ON. When the start switch is
turned ON while an error is detected
with the fault code of No.11, 12, 19, 30,
33, 43, 41 or 50.
Engine trouble warning light flashes
when the start switch is turned ON.
Unable Unable