Connect Scantool & Engine "ON"

Warm up the engine to normal operating temperature.

Monitor the "HO2S VOLTAGE(B1S2)" parameter on scantool.

Specification : 0.4 ~ 0.6V.

Is the measured voltage within specification?

YES

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection,bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO

▶ Go to "Terminal and Connector inspection" procedure.