Yamaha YP125R, Service Manual

Page: 439 / 498

FUEL INJECTION SYSTEM
8-42
Reinstatement method Starting the engine and operating it at idle.
Fault code No. 30
Item
Latch up detected.
No normal signal is received from the lean angle sensor.
Fail-safe system
Unable to start engine
Unable to drive vehicle
Diagnostic code No. 08
FI diagnostic tool display
Lean angle sensor
• 0.4–1.4 (upright)
• 3.7–4.4 (overturned)
Checking method
Remove the lean angle sensor and incline it more than 45 de-
grees.
Probable cause of malfunction Check or maintenance job
1 The vehicle has overturned. • Raise the vehicle upright.
2 Installed condition of the lean angle sen-
sor. • Check the installed direction and condition of
the sensor.
3 Connections
• Lean angle sensor coupler
• Wire harness ECU coupler • Check the coupler for any pins that may be
pulled out.
• Check the locking condition of the coupler.
• If there is a malfunction, repair it and connect
the coupler securely.
4 Defective lean angle sensor. • Execute the diagnostic mode. (Code No. 08)
• Replace if defective.
Refer to “CHECKING THE LEAN ANGLE
SENSOR” on page 8-84.
Reinstatement method
Turning the main switch to “ON” (however, the engine cannot be
restarted unless the main switch is first turned “OFF”).
Fault code No. 31
Item
O
2
sensor: The amount of air-fuel ratio feedback compensa-
tion is maintained continuously in the vicinity of the upper lim-
it.
Fail-safe system
Able to start engine
Able to drive vehicle
Diagnostic code No. —
FI diagnostic tool display —
Checking method —
Probable cause of malfunction Check or maintenance job
Fault code No. 24
Item
O
2
sensor: no normal signal is received from the O
2
sensor.