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

Connect the GDS and go to ""Current Data"".

Monitor HO2S 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.

IG "OFF". Disconnect HO2S(B1/S2) connector.

IG "ON".

Measure voltage between power terminal of HO2S(B1/S2) heater harness connector and chassis ground.

Is the measured voltage within specification ?

	▶ Go to " Control Circuit Inspection " procedure.
	▶ Repair open or short to ground in HO2S(B1/S2) Heater power circuit. Go to "Verification of Vehicle Repair" procedure.

IG "OFF". Disconnect HO2S(B1/S2) connector.

Measure resistance between control terminal of HO2S(B1/S2) heater harness connector and chassis ground.

Is the measured resistance within specification ?

	▶ Go to " Control Circuit Inspection " procedure.
	▶ Repair short to ground in HO2S (B1/S2) heater control circuit. Go to "Verification of Vehicle Repair" procedure.

IG "OFF". Disconnect HO2S(B1/S2) and PCM connector.

Measure resistance between control terminal of HO2S(B1/S2) heater harness connector and heater control terminal of PCM harness connector.

Is the measured resistance within specification ?

	▶ Go to "Component Inspection" procedure.
	▶ Repair open in HO2S(B1/S2) heater control circuit. Go to "Verifiction of Vehicle Repair" procedure.