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Disconnect the HO2S(s) and PCM/ECM connectors and inspect for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Reconnect the connectors.

Monitor HO2S(s) values in Current Data, check and wiggle the harness(es), connector(s), and terminal(s).

Any change in the values indicates a poor connection. Was a connector problem found?

	▶ Repair the connector. Go to "Verification of Vehicle Repair" procedure.
	▶ Go to "Power Circuit Inspection" procedure.

Measure voltage between Heater Power terminal of the HO2S harness connector and chassis ground.

Specification : B+

Is voltage display near the specified value?

	▶ Go to "Control Circuit Inspection" procedure.
	▶ Check for open or short in the power supply circuit between the main relay and the HO2S. Especially check for "15A Sensor 2 fuse" is installed and not blown. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

note

HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.

Measure voltage between Heater Control terminal of the HO2S harness connector and chassis ground.

Specification : Approx. 2~3V

Is voltage within the specification?

	▶ Go to "Component Inspection" procedure.
	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.

note

HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.