Yamaha YZF-R125 Service Manual page 320

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Fault code No. 39
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• Fuel injector coupler
• Main wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective fuel injector.
Fault code No. 41
Diagnostic code No.
Order Item/components and probable
cause
1 Connections
• Lean angle sensor coupler
• Main wire harness ECU coupler
2 Open or short circuit in wire harness.
3 Defective lean angle sensor.
Symptom Fuel injector: open or short circuit detected.
36 Fuel injector
Symptom Lean angle sensor: open or short circuit detected.
08 Lean angle sensor
FUEL INJECTION SYSTEM
Check or maintenance job
• Check the couplers for any pins
that may have pulled out.
• Check the locking condition of
the couplers.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
• Repair or replace if there is an
open or short circuit.
• Between fuel injector coupler
and ECU coupler.
(red/white–red/white)
(orange/black–orange/black)
• Execute the diagnostic mode.
(Code No.36)
• Replace if defective.
Refer to "CHECKING THE
FUEL INJECTOR" on page 7-6.
Check or maintenance job
• Check the coupler for any pins
that may have pulled out.
• Check the locking condition of
the coupler.
• If there is a malfunction, repair it
and connect the coupler se-
curely.
• Repair or replace if there is an
open or short circuit.
• Between lean angle sensor
coupler and ECU coupler.
(gray/red–gray/red)
(yellow/green–yellow/green)
(gray/black–gray/black)
• Execute the diagnostic mode.
(Code No.08)
• Replace if defective.
Refer to "CHECKING THE
LEAN ANGLE SENSOR" on
page 8-69.
8-49
Reinstatement
method
Cranking the
engine.
Reinstatement
method
Setting the
main switch to
"ON".