FUEL INJECTION SYSTEM
8-35
EAS27350
ECU SELF-DIAGNOSTIC FUNCTION
The ECU (engine) is equipped with a self-diagnostic function in order to ensure that the fuel injection
system is operating normally. If this function detects a malfunction in the system, it immediately oper-
ates the engine under substitute characteristics and illuminates the engine trouble warning light to alert
the rider that a malfunction has occurred in the system. Once a malfunction has been detected, a fault
code is stored in the memory of the ECU (engine).
● To inform the rider that the fuel injection system is not functioning, the engine trouble warning light
flashes when the start switch is being pushed to start the engine.
● If a malfunction is detected in the system by the self-diagnostic function, the ECU (engine) provides
an appropriate substitute characteristic operation, and alerts the rider of the detected malfunction by
illuminating the engine trouble warning light.
● After the engine has been stopped, the lowest fault code number appears on the clock LCD. Once a
fault code has been displayed, it remains stored in the memory of the ECU (engine) until it is deleted.
Engine trouble warning light indication and FI system operation
* The warning light flashes when any one of the conditions listed below is present and the start switch is pushed:
Checking for a defective engine trouble warning light bulb
The engine trouble warning light comes on for 1.4 seconds after the main switch has been turned to
“ON” and when the start switch is being pushed. If the warning light does not come on under these con-
ditions, the warning light bulb may be defective.
EAS27382
FAIL-SAFE ACTIONS (SUBSTITUTE CHARACTERISTICS OPERATION CONTROL)
If the ECU (engine) detects an abnormal signal from a sensor while the vehicle is being driven, the ECU
(engine) illuminates the engine trouble warning light and provides the engine with alternate operating
instructions that are appropriate for the type of malfunction.
When an abnormal signal is received from a sensor, the ECU (engine) processes the specified values
that are programmed for each sensor in order to provide the engine with alternate operating instructions
Warning light
indication
ECU (engine)
operation
FI operation Vehicle operation
Flashing*
Warning provided when
unable to start engine
Operation stopped Cannot be operated
Remains on Malfunction detected
Operated with substitute
characteristics in accor-
dance with the descrip-
tion of the malfunction
Can or cannot be oper-
ated depending on the
fault code
12: Crankshaft position sensor 41:
Lean angle sensor
(open or short-circuit)
19:
Sidestand switch
(open circuit in the wire to the ECU (engine))
50:
ECU (engine) internal malfunction
(faulty ECU (engine) memory)
30:
Lean angle sensor
(latch up detected)
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