Yamaha ROADLINER XV19SW, Service Manual

Page: 391 / 444

FUEL INJECTION SYSTEM
7-47
Fault code No. 24 Symptom No normal signal is received from the O
2
sensor.
Diagnostic code No. — —
Order Item/components and probable
cause
Check or maintenance job Reinstatement
method
1 Installed state of O
2
sensor. Check for looseness or pinching. Starting the en-
gine and oper-
ating it at idle.
2 Connections
• O
2
sensor coupler
• Main 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 se-
curely.
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/white–gray/white)
(red/blue–red/blue)
(gray/green–gray/green)
(black/blue–black/blue)
4 Check fuel pressure. • Refer to “THROTTLE BODIES”
on page 6-6.
5 Defective O
2
sensor. • Replace if defective.