Substitute Characteristics Operation Control (Fail-Safe Action); Fail-Safe Actions Table - Yamaha YZF-R1P Service Manual

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
Item
Code No.
Cylinder identification
11 sensor
Crankshaft position
12 sensor
Intake air pressure
13 sensor (open or short
14 circuit) (pipe system)
Throttle position sen-
15
sor (open or short cir-
16
cuit) (stuck)
EXUP servo motor
17 (open or short circuit)
EXUP servo motor
(lock)
18
Sidestand switch
19 (open circuit in wire to
ECU)
Intake temperature
20
Atmospheric pressure
Coolant temperature
21
sensor
Intake temperature
22
sensor
Atmospheric pres-
23
sure sensor
33 Faulty ignition
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
44 amount of CO adjust-
ment on EEPROM
ECU internal malfunc-
tion (memory check
50
error)
FUEL INJECTION SYSTEM
Symptom
No normal signals are received
from the cylinder identification
sensor.
No normal signals are received
from the crankshaft position sen-
sor.
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-open or short
circuit detected.
A lock EXUP servo motor is
detected.
Open circuit is detected in the
input line from the sidestand
switch to the ECU.
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 pri-
mary 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).
Faulty ECU memory. When this
malfunction is detected, the code
number might not appear on the
meter.
7 - 4
Fail-safe action
Continues to operate the engine based
on the results of the cylinder identifica-
tion that existed up to that point.
• Stops the engine (by stopping the
injection and ignition).
• Fixes the intake air pressure to 760
mmHg.
• Fixes the throttle position sensor to
fully open.
• Turn the EXUP servo motor toward
the open side for 3 seconds and
then stop it.
• Perform the preventive control
against motor locking.
(Preform the lock release operation
twice every 100 seconds.)
– (No start)
• Fixes the intake air pressure and
atmospheric pressure to 760 mmHg.
• Fixes the coolant temperature to 60
°C.
• Fixes the intake temperature to 20
°C.
• Fixes the atmospheric pressure to
760 mmHg.
• Fuel is cut off only to the cylinder in
which a malfunction is detected.
• Turns OFF the fuel injection system
relay of the fuel system.
• Fixes the gear to the top gear.
• Fixes the battery voltage to 12 V.
–
–
FI
Able/unable to Able/unable to
start 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 on (depending on
the number of the number of
faulty cylinders) faulty cylinders)
Unable Unable
Able Able
Able Able
Able Able
Unable Unable