Connect scantool to Data Link Connector(DLC).
Warm up the engine to normal operating temperature.
Monitor the "HO2S OUT VOLT(B1S2)" parameter on scantool.
Specification : Appox. 0.6 ~ 0.7 Volts
Is the sensor switching properly?
YES
Fault is intermittent caused by poor contact in the sensor’s and/or ECM’s connector.
Fault was repaired and ECM memory was not cleared.
If the problem works out, Go to "Verification of Vehicle Repair" procedure.
NO
Go to "Inspection & Repair" procedure.