Test Description

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

1. 2
   
   The HO2S 2 voltage may default to the bias voltage. The DTC should be cleared and the Freeze Frame/Failure Records data recorded before proceeding. A normally functioning HO2S 2 voltage signal will fluctuate above and below the bias voltage amount. The action in the test step should result in a visible reaction from the HO2S 2 output.
2. 4
   
   A voltage reading other than the specified amount in this step indicates an open circuit condition in one of the signal circuits or the PCM.
3. 5
   
   This step checks for an open circuit condition in the signal circuits, independent of the PCM.
4. 7
   
   The conditions listed may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.