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FUEL INJECTION SYSTEM
Fault 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.
1. Connect the pocket tester (DC 20 V) to the
atmospheric pressure sensor coupler ter-
minal as shown.
2. Set the main switch to “ON”.
3. Measure the atmospheric pressure sensor
output voltage.
4. Is the atmospheric air pressure sensor OK?
Reinstated by turn-
ing the main switch
ON.
Open or short circuit in wiring harness. Repair or replace if there is an open or short
circuit.
Between sensor coupler and ECU coupler
Blue - Blue
Black/Blue - Black/Blue
Pink - Pink
Installed condition of atmospheric pressure
sensor
Check the installed area for looseness or
pinching.
Connected condition 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
Tester positive probe
→
blue
1
Tester negative probe
→
black/blue
2
1
2
Atmospheric pressure sensor
output voltage
3.75 ~ 4.25 V