CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR.

1) Turn the ignition switch to OFF.

2) Measure the voltage between ECM and chassis ground.

Connector & terminal

(B134) No. 5 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

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