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FI
FUEL INJECTION SYSTEM
SUBSTITUTE CHARACTERISTICS OPERATION CONTROL (FAIL-SAFE ACTION)
If the ECU detects an abnormal signal from a sensor while the motorcycle is being driven, the ECU
illuminates the engine trouble warning light and provides the engine with substitute characteristic
operation instructions that are appropriate for the type of the malfunction.
When an abnormal signal is received from a sensor, the ECU processes the specified values that
are programmed for every sensor, in order to provide the engine with substitute characteristics
operation instructions that enable the engine to continue to operate (or to stop its operation,
depending on circumstances).
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
Able/unable to
start
Able/unable to
drive
11
Cylinder identification
sensor
No normal signals are received
from the cylinder identification
sensor.
Continues to operate the engine based
on the results of the cylinder identifica-
tion that existed up to that point.
Unable Able
12
Crankshaft position
sensor
No normal signals are received
from the crankshaft position sen-
sor.
• 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.
• Fixes the intake air pressure to 760
mmHg.
Able Able
15
16
Throttle position sen-
sor (open or short cir-
cuit) (stuck)
Throttle position sensor - open or
short circuit detected.
• Fixes the throttle position sensor to
fully open. Able Able
17
EXUP servo motor
(open or short circuit)
EXUP servo motor-open or short
circuit detected.
• Turn the EXUP servo motor toward
the open side for 3 seconds and
then stop it.
Able Able
18
EXUP servo motor
(lock)
A lock EXUP servo motor is
detected.
• Perform the preventive control
against motor locking.
(Preform the lock release operation
twice every 100 seconds.)
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 temperature
Atmospheric pressure
Defective values are detected due
to the internal malfunction
• 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.
• Fixes the coolant temperature to 60
°C.
Able Able
22
Intake temperature
sensor
Intake temperature sensor - open
or short circuit detected.
• Fixes the intake temperature to 20
°C.
Able Able
23
Atmospheric pres-
sure sensor
Atmospheric pressure sensor -
open or short circuit detected.
• Fixes the atmospheric pressure to
760 mmHg.
Able Able
33
34
35
36
Faulty ignition Open circuit detected in the pri-
mary lead of the ignition coil.
• Fuel is cut off only to the cylinder in
which a malfunction is detected.
Able
(depending on
the number of
faulty cylinders)
Able
(depending on
the number of
faulty cylinders)
30
41
Lean angle cut-off
switch (latch up
detected)
(open or short circuit)
Lean angle cut-off switch-open or
short circuit detected.
• 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.
• Fixes the gear to the top gear.
Able Able
43
Fuel system voltage
(monitor voltage)
The ECU is unable to monitor the
battery voltage (an open circuit in
the line to the ECU).
• Fixes the battery voltage to 12 V.
Able Able
44
Error in writing the
amount of CO adjust-
ment on EEPROM
An error is detected while reading
or writing on EEPROM (CO
adjustment value).
–
Able Able
50
ECU internal malfunc-
tion (memory check
error)
Faulty ECU memory. When this
malfunction is detected, the code
number might not appear on the
meter.
–
Unable Unable