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

Measure the resistance between ECM and chassis ground.

Connector & terminal

(B134) No. 18 — Chassis ground:

(B134) No. 28 — Chassis ground:

QUESTION

Is the resistance 1 MΩ or more?

Yes No

Repair the ground short circuit of harness between ECM and front oxygen (A/F) sensor.