Yamaha R15 2022, Service Manual

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8-31
FUEL INJECTION SYSTEM
– + ELEC
EAS30506
TROUBLESHOOTING METHOD
TIP
• If any of the following have been performed, reset the A/F control learning data (code No. D87).
- Replace the ECU.
- Replace or clean the throttle body.
- Replace the TPS.
• Reset the A/F control learning data even in the case of poor starting (refer to the flowchart below).
There is no engine operation signal or the engine trouble warning light is lit.
*If there is no engine operation signal, the engine trouble warning light may not be able to light up.
The engine trouble warning light lights up.
The engine trouble warning light is not lit.
Check the error code displayed on the FI diag-
nostic tool.
Find the system malfunction.
Refer to “SELFDIAGNOSTIC FUNCTION TA-
Find the possible reason for the system malfunction.
Refer to “DIAGNOSTIC CODE TABLE”.
Inspecting and repairing the possible cause of
error
Fault code No.
Inspect and repair.
Refer to “TROUBLE-
SHOOTING DE-
TAILS”.
In the diagnostic
mode, view and op-
erate the sensors
and actuators.
Refer to “SENSOR
AND ACTUATOR
For ECU reinstallation, refer to recovering initial
status in “TROUBLESHOOTING DETAILS”.
Turn the main switch to “OFF” and then back to
“ON”. Check if an error code is displayed.
Repair complete.
Erase the malfunction history:
Turning the main switch to “OFF” will not erase the malfunction history.
Erase the malfunction history in the diagnostic mode. Refer to “Operation of the Yamaha diagnostic tool
(Fault diagnosis mode) (Step no. 12)”.
In the diagnostic mode, inspect and operate
the following sensors and actuators. Refer to
“SENSOR AND ACTUATOR OPERATION
TABLE”.
30: Ignition coil
36: Fuel injector
Engine malfunction.
Inspecting and re-
pairing internal parts.
Refer to “ENGINE” in
chapter 5.
Inspect engine situation.
No fault code No.
Inspect and repair.
Refer to “SELFDI-
AGNOSTIC FUNC-
TION GUIDE”.
Faulty sensor or
actuator.
Sensors and actua-
tors conform to in-
spection and
repair.
Normal
Abnormal
Inspect engine situation.
Reset ECU learning data.(Diagnostic code
No.087)
Abnormal
There is no error code displayed.
Normal
Normal
Abnormal
Normal
Normal
Error code displays.
*For when engine trouble warning light is lit.
Abnormal
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