Yamaha XT660 2004, Service Manual

Page: 350 / 463

7 - 6
FI
FUEL INJECTION SYSTEM
EAS00904
TROUBLESHOOTING CHART
Engine operation is not normal or the engine trouble warning light is on.
The engine trouble warning light may not come on even if the engine operation is not normal.
The engine trouble warning light comes on.
Check the fault code number displayed on the meter.
Identify the system with the malfunction.
Refer to “FAIL-SAFE ACTION TABLE”.
Identify the probable cause of the malfunction.
Refer to “Diagnostic monitoring code table”.
Check and repair the probable cause of the malfunc-
tion.
Fault code No. is indi-
cated. Fault code No. is not
indicated.
Check and repair. Refer
to “TROUBLESHOOT-
ING DETAILS”. Moni-
tor the operation of the
sensors and the actua-
tors in the diagnostic
mode. Refer to “Diag-
nostic mode table”. Check and repair.
Refer to “FAIL-SAFE
ACTION TABLE”.
Perform the ECU reinstatement action.
Refer to “Restore method” in “TROUBLESHOOTING
DETAILS”.
Set the main switch to “OFF”, set it back to “ON”, and
then check if the fault code number is still displayed
on the meter.
Repairs completed
No fault code number displayed
Erase the malfunction history.*
The malfunction history is stored even if the main switch is set to “OFF”. The malfunction history must be erased in the
diagnostic mode. Refer to “Diagnostic mode table (Diagnostic code No. 62)”.
* Operated when the engine trouble warning light is on.
The engine trouble warning light does not come on.
Check the operation of the following sensors and
actuators in the diagnostic mode. Refer to “Diagnostic
mode table”.
01: Throttle position sensor (throttle angle)
07: Vehicle speed pulse
09: Fuel system voltage
21: Neutral switch
30: Ignition coil
36: Fuel injector
48: Air induction system solenoid
Malfunction of the
engine Defective sensor or
actuator
Check and repair the
inner parts of the
engine. Refer to
chapter 5.
Check and repair the
corresponding sen-
sor or actuator.
Check the engine condition.
Fault code number
displayed
OK NG
OK OK NG
OK