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

(B135) No. 7 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

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