3.
Monitor the "HO2S OUT VOLT(B1S1)" parameter on scantool.
1)
Verify that the signal is varying from rich(above 0.45V) to lean(below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V).
Connect scantool to Data Link Connector(DLC).
Warm up the engine to normal operating temperature.
Monitor the "HO2S OUT VOLT(B1S1)" parameter on scantool.
Verify that the signal is varying from rich(above 0.45V) to lean(below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V).
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.
