Yamaha YZF-R1S Service Manual - page 349
7-5
FUEL INJECTION SYSTEM
FI
SUBSTITUTE CHARACTERISTICS 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
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
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
101.3 kpa.
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
17
EXUP servo motor
potention
(open or short circuit)
EXUP servo motor potention-open or
short circuit detected.
S 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 of the EXUP servo motor is
detected.
S Perform the preventive control
against motor locking.
Perform the lock release operation
twice every 100 seconds.
Able
Able
19
Sidestand switch (open
circuit in wire to ECU)
Open circuit in the input line of ECU
No.15 terminal is detected when the
start switch is pressed.
-- (No start)
Unable
Unable
20
Intake air pressure
Atmospheric pressure
Defective values are detected due to
the internal malfunction
S Fixes the intake air pressure and
atmospheric pressure to 101.3 kpa.
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
101.3 kpa.
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
detective, cut the injection of #1 and
#4 cylinders, when the #2 cylinder is
detective, cut the injection of #2 and
#3 cylinders).
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)
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)
The ECU is unable to monitor the
battery voltage (an open circuit in the
line to the ECU).
S Fixes the battery voltage to 12 V.
Able
Able
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