Fail-Safe Actions (Substitute Characteristics Operation Control) - Yamaha 2007 FZ6-NA Service Manual

EAS27362

FAIL-SAFE ACTIONS (SUBSTITUTE CHARACTERISTICS OPERATION CONTROL)

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.
Self-Diagnostic Function
Fault
code No.
Crankshaft position
12
sensor
Intake air pressure
13 sensor
(open or short circuit)
Intake air pressure
14 sensor
(pipe system)
Throttle position sen-
15 sor
(open or short circuit)
Throttle position sen-
16 sor
(stuck)
Sidestand switch
19 (open circuit wire har-
ness to ECU)
Coolant temperature
21
sensor
Intake air temperature
22
sensor
O sensor
24
2
30 Lean angle sensor
Ignition coil (#1, #4)
33
(faulty ignition)
Item
No normal signals are received
from the crankshaft position sen-
sor.
Intake air pressure sensor-open or
short circuit detected.
Intake air pressure sensor-pipe
system malfunction (clogged or
detached hose).
Throttle position sensor-open or
short circuit detected.
The throttle position sensor is
stuck.
Open circuit is detected in the input
line from the sidestand switch to
the ECU.
Coolant temperature sensor-open
or short circuit detected.
Intake air temperature sensor-
open or short circuit detected.
No normal signal is received from
the O
Latch up detected.
No normal signal is received from
the lean angle sensor.
Malfunction detected in the pri-
mary wire of the ignition coil (#1,
#4).
FUEL INJECTION SYSTEM
Symptom
sensor.
2
8-34
Able/ Able/
unable to unable to
start drive
Unable Unable
Able Able
Able Able
Able Able
Able Able
Unable Unable
Able Able
Able Able
Able Able
Unable Unable
Able Able
(depending (depending
on the num- on the num-
ber of faulty ber of faulty
cylinders) cylinders)