Troubleshooting Method - Yamaha YBR250 2007 Service Manual

TROUBLESHOOTING METHOD

The engine operation is not normal and the
engine trouble warning light comes on.
1. Check:
• fault code number
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 malfunction.
Refer to "Diagnostic code table".
2. Check and repair the probable cause of
malfunction.
Fault code No.
Check and repair.
Refer to
"TROUBLESHOOTING
DETAILS".
Monitor the operation of
the sensors and
actuators in the
diagnostic mode.
Refer to "Sensor
operation table" and
"Actuator operation
table".
3. Perform Fuel Injection System reinstatement
action.
Refer to"Reinstatement method" of table in
"TROUBLESHOOTING DETAILS".
4. Turn the main switch to "OFF" and back to
"ON", then check that no fault code number
is displayed.
NOTE:
If fault codes are displayed, repeat steps (1) to
(4) until no fault code number is displayed.
5. Erase the malfunction history in the diagnostic
mode. Refer to "Sensor operation table
(Diagnostic code No. 62)".
NOTE:
Turning the main switch to "OFF" will not erase
the malfunction history.
FUEL INJECTION SYSTEM
No fault code No.
Check and repair.
Refer to "Self-Diagnostic
Function table"
The engine operation is not normal but the
engine trouble warning light does not come
on.
1. Check operation of following sensors and
actuators in the Diagnostic mode. Refer to
"Sensor operation table" and "Actuator
operation table".
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 inner parts
of the engine.
6-7
FI