Yamaha R1 Series 2015, Service Manual

Page: 530 / 704

FUEL INJECTION SYSTEM
8-49
EAS30505
ECU SELF-DIAGNOSTIC FUNCTION
The ECU 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 operates the en-
gine under substitute characteristics and illuminates the engine trouble and system warning light to alert
the rider that a malfunction has occurred in the system. Once a malfunction has been detected, a fault
code number is stored in the memory of the ECU.
•
To inform the rider that the fuel injection system is not functioning, the engine trouble and system
warning light flashes and the engine trouble warning icon on LCD comes on while the “ ” side of the
start/engine stop switch is being pushed to start the engine.
• If a malfunction is detected in the system by the self-diagnostic function, the ECU provides an appro-
priate substitute characteristic operation, and alerts the rider of the detected malfunction by illuminat-
ing the engine trouble and system warning light.
•
After the engine has been stopped, the lowest fault code number appears on the meter display. Once
a fault code has been displayed, it remains stored in the memory of the ECU until it is deleted.
Engine trouble and system warning light indication and fuel injection system operation
* The warning light flashes when any one of the following conditions is present and the “ ” side of the
start/engine stop switch is pushed:
Checking the engine trouble and system warning light
The engine trouble and system warning light comes on for around 4 seconds after the main switch has
been set to “ON” and it comes on while the “ ” side of the start/engine stop switch is being pushed. If
the warning light does not come on under these conditions, the warning light (LED) may be defective.
Warning light
indication
ECU operation
Fuel injection
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:
IMU (Inertial Measurement Unit)
(open or short circuit)
19:
Sidestand switch
(open circuit in the wire to the ECU)
50:
ECU internal malfunction
(faulty ECU memory)
30:
IMU (Inertial Measurement Unit)
(latch up detected)
a. Main switch “OFF”
b. Main switch “ON”
c. Engine trouble and system warning light off
d. Engine trouble and system warning light on
for around 4 seconds