Yamaha 2002 TDM900, Service Manual

Page: 367 / 475

7-4
FUEL INJECTION SYSTEM
FI
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 op-
eration 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 cir-
cumstances).
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
Self-Diagnostic Function
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 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
Intake air pressure
sensor (open or short
circuit) Intake air pressure sensor - open or shor cir-
cuit
detected.
S
Fixes the intake air pressure to 760 mmHg.
Able Able
14
Intake air pressure
sensor (pipe system) Faulty intake air pressure sensor pipe system
a hose is detached, causing the constant
application of atmospheric pressure to the
sensor, or, the hose is clogged.
S
Fixes the intake air pressure to 760 mmHg.
Able Able
15
Throttle position sensor
(open or short circuit) Throttle position sensor - open or short circuit
detected.
S
Fixes the throttle position sensor to fully open.
Able Able
19
Sidestand switch (open
circuit wire to ECU) Open circuit is detected in the input line from
the sidestand switch to the ECU. – (No start)
Unable Unable
20
Intake temperature
Atmospheric pressure Defective values are detected due to the
internal malfunction
S
Fixes the intake air pressure and atmospheric pressure to 760
mmHg.
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 760 mmHg.
Able Able
24
O
2
sensor (inactive) No normal signals are received from the O
2
sensor.
–
Able Able
30
Lean angle cut-off switch
(latch up detected) The motorcycle has overturned.
S
Turns OFF the fuel injection system relay of the fuel system.
Unable Unable
33
Faulty ignition Open circuit detected in the primary wire of the
ignition coil (#1).
S
Fuel is cut off only to the cylinder in which a malfunction is de-
tected.
Able
(depending
on the
Able
(denpending
on the
34
Open circuit detected in the primary wire of the
ignition coil (#2).
on the
number of
faulty)
on the
number of
faulty)
41
Lean angle cut-off switch
(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
50
ECU internal
malfunction
(memory check error) Faulty ECU memory. When this malfunction is
detected, the code number might not appear
on the meter. –
Unable Unable
Communication error with the meter
Er-1
ECU internal
malfunction
(output signal error) No signals are received from the ECU. –
Unable Unable
Er-2
ECU internal
malfunction
(output signal error) No signals are received from the ECU within
the specified duration. –
Unable Unable
Er-3
ECU internal
malfunction
(output signal error) Data from the ECU cannot be received
correctly. –
Unable Unable
Er-4
ECU internal
malfunction
(input signal error) Non-registered data has been received from
the meter. –
Unable Unable