Yamaha YP125R, Руководство по обслуживанию

Страница: 440 / 498

FUEL INJECTION SYSTEM
8-43
1 Installed condition of O
2
sensor. • Check for looseness or pinching.
2 Connections
• O
2
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.
3 Open or short circuit in wire harness. • Repair or replace if there is an open or short
circuit.
• Between O
2
sensor coupler and ECU coupler.
(gray/green–gray/green)
(gray/black–gray/black)
(black/red–black/red)
(red/black–red/black)
4 Check fuel pressure. • Refer to “CHECKING THE FUEL PRESSURE”
on page 7-3.
5 Defective O
2
sensor. • Replace if defective.
Reinstatement method Starting the engine and operating it at idle.
Fault code No. 32
Item
O
2
sensor: The amount of air-fuel ratio feedback compensa-
tion is maintained continuously in the vicinity of the lower 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
1 Installed condition of O
2
sensor. • Check for looseness or pinching.
2 Connections
• O
2
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.
3 Open or short circuit in wire harness. • Repair or replace if there is an open or short
circuit.
• Between O
2
sensor coupler and ECU coupler.
(gray/green–gray/green)
(gray/black–gray/black)
(black/red–black/red)
(red/black–red/black)
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.