FI
6-19
FUEL INJECTION SYSTEM
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
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
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 / Red - Blue
Red / Blue - Black.
4
Check fuel pressure
• Refer to “CHECKING THE
FUEL PUMP AND PRESSURE
REGULATOR OPERATION”.
5
Defective O
2
sensor
• Replace if defective
Reinstated by
starting the
engine operating
it at idle is 15
minutes and
running at 80
km/h, until the
warning light turn
off
Summary of Contents for YBR250 2007
Page 1: ...YBR250 SERVICE MANUAL 5D1 F8197 E0 2007 ...
Page 2: ......
Page 359: ...YAMAHA MOTOR DA AMAZÔNIA LTDA ...
