9-69
P0030
EAS20397
P0030
EAS33134
TROUBLESHOOTING
Item
O
2
sensor heater: defective heater controller detected.
Fail-safe system
• Able to start engine
• Able to drive vehicle
Procedure
If more than one DTC is detected at the same time, perform troubleshooting of DTC listed below first.
• P0112, P0113, P0122, P0123, P0222, P0223, P2135
1. Connection of O
2
sensor coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
For this check, also set the engine stop switch to “ON”.
2. Connection of ECU coupler.
• Check the locking condition of the coupler.
• Disconnect the coupler and check the pins (bent or broken terminals and locking condition of the
pins).
Is the coupler condition normal?
YES
Go to step 2.
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 2.
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