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Is the coupler condition normal?
YES
Go to step 3.
NO
a. Connect the coupler securely or replace the wire harness.
b. Push the ON/start switch, and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the "Recovered" condition?
YES
Go to step 6, and complete the service.
NO
Start the engine, and then check the condition of the DTC.
Is it in the "Recovered" condition?
YES
Go to step 6, and complete the service.
NO
Go to step 3.
TIP
For this check, also set the engine stop switch to "ON".
3. Wire harness continuity.
• Disconnect the O
2
• Open circuit check
Between O
sensor coupler "1" and ECU cou-
2
pler "2"
Between O
sensor coupler "1" and fuel injec-
2
tion system relay coupler "3"
Is resistance 0 ?
YES
Go to "Short circuit check".
NO
a. Replace the wire harness.
b. Push the ON/start switch, and then check the condition of the DTC using the malfunction mode
of the YDT.
sensor coupler, ECU coupler and fuel injection system relay coupler.
2
3
Y/R
R
Y/W
R/L
R/L
R/B
L/Y
R
black/green–black/green
red/blue–red/blue
B/G
O
G/B
R/B
B
Y/R
B
Y/W
L/Y
R/L
B
B
9-70
1
R/L B/G
Gy/G B/L
P0030
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Troubleshooting
