Fail-Safe Action; Fail-Safe Actions Table - Yamaha YZF-R1S Service Manual

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
Item
Code No.
Cylinder identification
sensor
11
Crankshaft position
12
sensor
Intake air pressure
13
sensor (open or short
14
circuit) (pipe system)
Throttle position sensor
15
(open or short circuit)
16
(stuck)
EXUP servo motor
17 potention
(open or short circuit)
EXUP servo motor (lock)
18
Sidestand switch (open
19 circuit in wire to ECU)
Intake air pressure
20
Atmospheric pressure
Coolant temperature
21
sensor
Intake temperature
22
sensor
Atmospheric pressure
23
sensor
Faulty ignition
33
34
35
36
Lean angle cut-off
30
switch (latch up
41 detected) (open or short
circuit)
Speed sensor, neutral
switch
42
Fuel system voltage
43 (monitor voltage)
Error in writing the
amount of CO
44
adjustment on
EEPROM
FUEL INJECTION SYSTEM
Symptom
No normal signals are received from
the cylinder identification sensor.
No normal signals are received from
the crankshaft position sensor.
Intake air pressure sensor-open or
short circuit detected.
Faulty intake air pressure sensor
system.
Throttle position sensor-open or short
circuit detected.
EXUP servo motor potention-open or
short circuit detected.
A lock of the EXUP servo motor is
detected.
Open circuit in the input line of ECU
No.15 terminal is detected when the
start switch is pressed.
Defective values are detected due to
the internal malfunction
Coolant temperature sensor-open or
short circuit detected.
Intake temperature sensor-open or
short circuit detected.
Atmospheric pressure sensor-open or
short circuit detected.
Open circuit detected in the primary
lead of the ignition coil.
Lean angle cut-off switch-open or short
circuit detected.
No normal signals are received from the
speed sensor; or, an open or short
circuit is detected in the neutral switch.
The ECU is unable to monitor the
battery voltage (an open circuit in the
line to the ECU).
An error is detected while reading or
writing on EEPROM (CO adjustment
value).
7-5

Fail-safe action

Continues to operate the engine based
on the results of the cylinder
identification that existed up to that
point.
S Stops the engine (by stopping the
injection and ignition).
S Fixes the intake air pressure to
101.3 kpa.
S Fixes the throttle position sensor to
fully open.
S Turn the EXUP servo motor toward
the open side for 3 seconds and then
stop it.
S Perform the preventive control
against motor locking.
Perform the lock release operation
twice every 100 seconds.
-- (No start)
S Fixes the intake air pressure and
atmospheric pressure to 101.3 kpa.
S Fixes the coolant temperature to
60_C.
S Fixes the intake temperature to 20_C.
S Fixes the atmospheric pressure to
101.3 kpa.
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.
S Turns OFF the fuel injection system
relay of the fuel system.
S Fixes the gear to the top gear.
S Fixes the battery voltage to 12 V.
--
FI
Able / unable Able / unable
to start to drive
Unable Able
Unable Unable
Able Able
Able Able
Able Able
Able Able
Unable Unable
Able Able
Able Able
Able Able
Able Able
Able Able
(depending (depending
on the num- on the num-
ber of faulty ber of faulty
cylinders) cylinders)
Unable Unable
Able Able
Able Able
Able Able