1) Turn the ignition switch to ON.
2) Measure the voltage between rear oxygen sensor connector and chassis ground.
Connector & terminal
(T6) No. 4 (+) — Chassis ground (−):
Is the voltage 0.2 — 0.5 V?
Repair the harness and connector.
NOTE:
Repair the following locations.
• Open circuit of harness between rear oxygen sensor and ECM connector
• Poor contact of rear oxygen sensor and ECM connector
• Poor contact in ECM connector