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FUEL INJECTION SYSTEM
Code No. 23 Symptom Open or short circuit detected from the atmospheric pressure sensor.
Used diagnostic code No. 02 (atmospheric pressure sensor)
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
Defective atmospheric pressure sensor. Replace if defective.
Refer to “FUEL INJECTION SYSTEM” in
chapter 8.
Reinstated by turn-
ing the main switch
ON.
Open or short circuit in wiring harness or sub
lead.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Blue - Blue
Black/Blue - Black/Blue
Pink - Pink
Installed state of atmospheric pressure sensor Check the installed area for looseness or
pinching.
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
Atmospheric pressure sensor coupler
Main wiring harness ECU coupler
Code No. 24 Symptom No normal signal is received from the O
2
sensor.
Used diagnostic code No.
Inspection operation item and probable cause Operation item and countermeasure Reinstatement
method
Defective O
2
sensor. Replace if defective. Reinstated by
starting the engine,
operating it at idle,
and then racing it
after it has warmed
up.
Open or short circuit in wiring harness or sub
lead.
Repair or replace if there is an open or short
circuit.
Main wiring harness
Black/Blue - White
Gray/Green - Blue
Installed state of O
2
sensor Check the installed area for looseness or
pinching.
Connected state of connector
Inspect the coupler for any pins that may
have pulled out.
Check the locking condition of the coupler.
If there is a malfunction, repair it and connect it
securely.
O
2
sensor coupler
Main wiring ECU harness coupler
Sub-wire harness coupler
Check fuel pressure Inspect fault codes 31/32.
Refer to “CHECKING THE FUEL PUMP AND
PRESSURE REGULATOR OPERATION”.