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DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)

DTC P0134 O 2 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:


• Immediately at fault recognition

• GENERAL DESCRIPTION


Important

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


WIRING DIAGRAM:


CHECK HARNESS BETWEEN ECM AND FRONT OXYGEN (A/F) SENSOR CONNECTOR.

Turn the ignition switch to OFF.

Disconnect the connectors from ECM and front oxygen (A/F) sensor connector.

Measure the resistance of harness between ECM and front oxygen (A/F) sensor connector.

Connector & terminal

(B134) No. 33 — (B18) No. 1:

(B134) No. 26 — (B18) 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 ECM and front oxygen (A/F) sensor connector

• Poor contact in front oxygen (A/F) sensor connector

• Poor contact in ECM connector



CHECK POOR CONTACT.

Check poor contact in front oxygen (A/F) sensor connector.

Is there poor contact in front oxygen (A/F) sensor connector?

Yes

Repair poor contact in front oxygen (A/F) sensor connector.


No

Replace the front oxygen (A/F) sensor.