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DTC P0139 O2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2)

DTC P0139 O 2 SENSOR CIRCUIT SLOW RESPONSE (BANK 1 SENSOR 2)

DTC DETECTING CONDITION:


• Two consecutive driving cycles with fault

• GENERAL DESCRIPTION


Important

After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .


WIRING DIAGRAM:


CHECK ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Yes

• Inspect the relevant DTC using “List of Diagnostic Trouble Code (DTC)”.

•
Note

In this case, it is not necessary to inspect DTC P0139.



No


CHECK HARNESS BETWEEN REAR OXYGEN SENSOR AND ECM CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connector from rear oxygen sensor and oxygen sensor.

Measure the resistance in harness between rear oxygen sensor and ECM connector.

Connector & terminal

(B19) No. 3 — (B135) No. 17:

Is the resistance less than 1 Ω?

Yes


No

Repair open circuit in harness between rear oxygen sensor and ECM.


CHECK HARNESS BETWEEN REAR OXYGEN SENSOR AND ECM CONNECTOR.

Measure the resistance between ECM connector and chassis ground.

Connector & terminal

(B19) No. 3 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair open circuit in harness between rear oxygen sensor and ECM.


CHECK REAR OXYGEN SENSOR.

Measure the resistance between rear oxygen sensor terminals.

Terminals

No. 3 — No. 4:

Is the resistance less than 1 Ω?

Yes

Replace the rear oxygen sensor.


No

Temporary poor contact occurs. Check poor contact in connector.