FUEL INJECTION SYSTEM
8-52
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 and oper-
ating it at idle.
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 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/white–red/white)
(gray/black–gray/black)
(black/blue–black/blue)
4 Check fuel pressure. • Refer to “CHECKING THE
FUEL PRESSURE” on page
7-9.
5 Defective O
2
sensor. • Replace if defective.
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