Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 2  - HO2S 2 voltage may default to bias voltage. DTC should be cleared and freeze frame/failure records data recorded before proceeding. A normally functioning HO2S 2 voltage signal will fluctuate greater than and less than bias voltage amount. Action in test step should result in a visible reaction from HO2S 2 output.
2. 4  - A voltage reading other than specified amount in this step indicates an open circuit condition in one of the signal circuits or PCM.
3. 5  - This step inspects for an open circuit condition in signal circuits, independent of PCM.
4. 7  - The conditions listed in the table may contribute to failure of HO2S. Conditions listed apply only to this type of failure.