Troubleshooting Method - Yamaha YZF-R125 Service Manual

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EAS27400

TROUBLESHOOTING METHOD

The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
• Fault code number
M MMM M MMM M M MMM M
a. Check the fault code number displayed on
the FI diagnostic tool.
b. Identify the faulty system with the fault code.
Refer to "Self-Diagnostic Function table".
c. Identify the probable cause of the malfunc-
tion. Refer to "Diagnostic code table".
L LLL L LLL L L LLL L
2. Check and repair the probable cause of the
malfunction.
Fault code No.
Check and repair.
Refer to "TROUBLE-
SHOOTING DE-
TAILS" on page 8-41.
Monitor the opera-
tion of the sensors
and actuators in the
diagnostic mode. Re-
fer to "Sensor opera-
tion table" and
"Actuator operation
table".
3. Perform fuel injection system reinstatement
action.
Refer to "Reinstatement method" of table in
"TROUBLESHOOTING DETAILS" on page
8-41.
4. Set the main switch to "OFF" and back to
"ON", and then check that no fault code num-
ber is displayed.
NOTE:
If other fault codes are displayed, repeat steps
(1) to (4) until no fault code number is displayed.
5. Erase the malfunction history in the diagnos-
tic mode. Refer to "Sensor operation table
(Diagnostic code No. 62)".
NOTE:
Setting the main switch to "OFF" will not erase
the malfunction history.
M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L
No fault code No.
Check and repair.
Refer to "Self-Diag-
nostic Function ta-
ble".
FUEL INJECTION SYSTEM
The engine operation is not normal but the
engine trouble warning light does not come
on.
1. Check the operation of the following sensors
and actuators in the diagnostic mode. Refer
to "Sensor operation table" and "Actuator op-
eration table".
MMM
30: Ignition coil
36: Fuel injector
If a malfunction is detected in the sensors or
actuators, repair or replace all faulty parts.
If no malfunction is detected in the sensors
and actuators, check and repair the inner
LLL
parts of the engine.
8-34