Substitute Characteristics Operation Control (Fail-Safe Action); Fail-Safe Actions Table - Yamaha 2006 RX10GTAXW 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 illu-
minates the engine trouble warning light and provides the engine with alternate operating instruc-
tions 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)
Intake air pressure
20 Atmospheric pressure
Coolant temperature
sensor
21
Intake temperature
22
sensor
Atmospheric pressure
23 sensor (open or short
circuit)
Oil pressure dropped
30
Faulty ignition
33
34
35
36
Speed sensor
42
Fuel system voltage
43 (monitor voltage)
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.
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.
Engine stops when the oil
pressure drop is detected.
Open circuit detected in the
primary lead of the ignition coil.
No normal signals are received
from the speed sensor.
The ECU is unable to monitor
the battery voltage (an open
circuit in the line to the ECU).
61
Fail-Safe Action
Continues to operate the engine
based on the results of the
cylinder identification that
existed up to that point.
• Stops the engine (by stopping
the injection and ignition).
• Fixes the intake air pressure to
85.0 kPa.
• Fixes the throttle position
sensor to fully open.
• Fixes the intake air pressure
and atmospheric pressure to
85.0 kPa.
• Fixes the coolant temperature
to 60°C. After the engine starts,
the radiator fan relay will be
turned ON.
• Fixes the intake temperature to
0°C.
• Fixes the atmospheric
pressure to 85.0 kPa.
• Fuel pump and fuel injection
are stopped. (Main relay is off.)
• 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.
• Assumes highest ratio.
• Fixes the battery voltage to 12 V.
FI
Starting Running
Capability Capability
Unable Able
Unable Unable
Able Able
Able Able
Able Able
Able Able
Able Able
Able Able
Unable Unable
Able Able
(depending (depending
on the on the
number of number of
faulty faulty
cylinders) cylinders)
Able Able
Able Able