CHECK POWER SUPPLY TO REAR OXYGEN SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from rear oxygen sensor.

3) Turn the ignition switch to ON.

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

Connector & terminal

(E22) No. 2 (+) — Engine 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 in harness between A/F, oxygen sensor relay and rear oxygen sensor connector

• Poor contact of A/F, oxygen sensor relay connector

• Poor contact of coupling connector