Chapter 4 EI system diagnosis Section 4 EI system troubleshooting
4—20
INSPECTION
1) The connectors of oxygen sensor is located under the
fuel tank,
Turn the ignition switch to the “OFF”position.
2) Check the Oxygen sensor coupler for loose or
poorcontacts.
Is OK?
YES
●
B/Bl , G/Bl (O
2
Sensor)wire open
or shorted
to ground, or poor B17(J2-17)
B10(J2-10)
connectionofECU
coupler. [Sensor side]
B/Gr (O
2
S heater)wireopen
or shorted to ground, or poor
B7(J2-7)(O
2
ECU coupler.
B/G coupler open or shorted to the
wiring harness (main relay output
side).
[Heater side]
●
If wire and connection are OK,
intermittent trouble orfaulty
ECU.
●
Re check each terminal and wire
harness for open circuit and poor
connection.
NO
Replace the Oxygen sensor with a
new one.
B/G
G/Bl
B/Bl
B/Gr
O
2
Sensor
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