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FI
FUEL INJECTION SYSTEM
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.
Table of substitute characteristic operation control by self-diagnostic fault code
Code No. Item Fail-safe action
Able/unable to
start
Able/unable to
drive
11
Cylinder identification
sensor
Continues to operate the engine based on the results
of the cylinder identification that existed up to that
point.
Able Able
12
Crankshaft position sen-
sor
• Stops the engine (by stopping the injection and
ignition).
Unable Unable
13
14
Intake air pressure sensor
(open or short circuit)
(pipe system)
• Fixes the intake air pressure to 760 mmHg.
Able Able
15
16
Throttle position sensor
(open or short circuit)
(stuck)
• Fixes the throttle position sensor to fully open.
Able Able
19
Sidestand switch
(open circuit in wire to
ECU)
-- (No start)
Unable Unable
21
Coolant temperature sen-
sor
• Fixes the coolant temperature to 60 °C.
Able Able
22
Intake temperature sen-
sor
• Fixes the intake temperature to 20 °C.
Able Able
23
Atmospheric pressure
sensor
• Fixes the atmospheric pressure to 760 mmHg.
Able Able
24
31
32
O
2
sensor
(inactive)
(compensation stuck to
upper limit)
(compensation stuck to
lower limit)
--
Able Able
33
34
Faulty ignition • Fuel is cut off only to the cylinder in which a mal-
function is detected.
Able
(depending on
the number of
faulty cylinders)
Able
(depending on
the number of
faulty cylinders)
30
41
Lean angle cut-off switch
(latch up detected)
(open or short circuit)
• Turns OFF the fuel injection system relay of the fuel
system. Unable Unable
42
Speed sensor, neutral
switch
• Fixes the gear to the top gear.
Able Able
43
Fuel system voltage
(monitor voltage)
• Fixes the battery voltage to 12 V.
Able Able
44
Error in writing the
amount of CO adjust-
ment on EEPROM
--
Able Able
50
ECU internal malfunction
(memory check error)
--
Unable Unable