CHECK POWER SUPPLY TO REAR OXYGEN SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from the rear oxygen sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between rear oxygen sensor connector and engine ground or chassis ground.

Connector & terminal

(B18) No. 2 (+) — Chassis ground (−):

QUESTION

Is the voltage 10 V or more?

Yes No

Repair the power supply line.

NOTE:

In this case, repair the following item:

• Open circuit of harness between main relay and rear oxygen sensor connector

• Poor contact of the rear oxygen sensor connector

• Poor contact of coupling connector