FUEL INJECTION SYSTEM
8-65
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 condition of O
2
sensor Check for looseness or pinching. Starting the en-
gine, warming it
up until the
coolant temper-
ature is 60 °C
or more, and
then running it
between 2000–
3000 r/min un-
til the engine
trouble warn-
ing light turns
off.
2 Connections
• O
2
sensor coupler
• Relay unit coupler
• Wire harness ECU coupler
• Sub-wire harness coupler
• Front cowling wire harness 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,
sub-wire harness, and/or front cowling
wire harness.
• Repair or replace if there is an
open or short circuit.
• Between O
2
sensor coupler and
ECU coupler.
(black/blue–black/blue)
(gray/white–gray/white)
• Between O
2
sensor coupler and
relay unit coupler.
(red/blue–red/blue)
• Between O
2
sensor coupler and
sub-wire harness coupler.
(black–black)
4 Check fuel pressure. Refer to “CHECKING THE FUEL
PRESSURE” on page 7-7.
5 Defective O
2
sensor Replace if defective.
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