CHECK HARNESS BETWEEN ECM AND REAR OXYGEN SENSOR CONNECTOR.

1) Connect the connector to ECM.

2) Turn the ignition switch to ON.

3) Measure the voltage between rear oxygen sensor connector and chassis ground.

Connector & terminal

(E22) No. 4 (+) — Chassis ground (−):

QUESTION
Is the voltage 0.2 — 0.5 V?
Yes	No
	Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit in harness between ECM and rear oxygen sensor • Poor contact of ECM connector • Poor contact of coupling connector