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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

• Check DTC using “List of Diagnostic Trouble Code (DTC)”.

•
Note

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



No


CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connectors from ECM and rear oxygen sensor.

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

Connector & terminal

(B137) No. 24 — (B19) No. 3:

Is the resistance less than 1 Ω?

Yes


No

• Repair harness and connector.

•
Note

In this case, repair the following:

• Open circuit in harness between rear oxygen sensor and ECM connector



CHECK HARNESS BETWEEN REAR OXYGEN SENSOR AND ECM CONNECTOR.

Measure the resistance between rear oxygen sensor harness connector and chassis ground.

Connector & terminal

(B19) No. 3 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes


No

Repair short circuit to ground in harness between rear oxygen sensor and ECM connector.


CHECK REAR OXYGEN SENSOR DATA.

Measure the resistance between connector terminals of rear oxygen sensor.

terminals

No. 3 — No. 4:

Is the resistance less than 1 Ω?

Yes

Replace the rear oxygen sensor.


No

Repair connector. Poor contact in rear oxygen sensor connector.