Yamaha YZF-R125 Service Manual page 308

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9. Set the main switch to "OFF" to cancel the diagnostic mode.
10.Disconnect the FI diagnostic tool and connect the self-diagnosis signal connector.
Diagnostic code table
Fault
code Symptom
No.
No normal signals are re-
12 ceived from the crankshaft
position sensor.
Intake air pressure sensor:
13 open or short circuit detect-
ed.
Intake air pressure sensor:
14 system malfunction
(clogged hole).
Throttle position sensor:
15 open or short circuit detect-
ed.
Stuck throttle position sen-
16
sor is detected.
A break or disconnection of
19 the blue/yellow lead of the
ECU is detected.
Coolant temperature sen-
21 sor: open or short circuit
detected.
Intake air temperature sen-
22 sor: open or short circuit
detected.
No normal signal is re-
30 ceived from the lean angle
sensor.
Primary lead of the ignition
33
coil: open circuit detected.
Fuel injector: open or short
39
circuit detected.
Lean angle sensor: open or
41
short circuit detected.
FUEL INJECTION SYSTEM
Probable cause of malfunction
• Open or short circuit in wire harness.
• Defective crankshaft position sensor.
• Malfunction in AC magneto rotor.
• Improperly installed sensor.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective intake air pressure sensor.
• Malfunction in ECU.
• Intake air pressure sensor hole is clogged.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective throttle position sensor.
• Malfunction in ECU.
• Stuck throttle position sensor.
• Malfunction in ECU.
• Open or short circuit in wire harness (ECU
coupler).
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective coolant temperature sensor.
• Malfunction in ECU.
• Improperly installed coolant temperature
sensor.
• Open or short circuit in wire harness.
• Defective air temperature sensor.
• Malfunction in ECU.
• Overturned.
• Malfunction in ECU.
• Defective lean angle sensor.
• Improperly installed lean angle sensor.
• Open circuit in wire harness.
• Malfunction in ignition coil.
• Malfunction in a component of ignition cut-
off circuit system.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective fuel injector.
• Improperly installed fuel injector.
• Malfunction in ECU.
• Open or short circuit in wire harness.
• Defective lean angle sensor.
• Malfunction in ECU.
8-37
Diagnostic
code No.
—
03
03
01
01
20
06
05
08
30
36
08