Test Description
WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers in the diagnostic procedures.
- 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 greater than and less than the bias voltage amount. The action in the test step should result in a visible reaction from the HO2S 2 output. - 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. - 5
This step inspects for an open circuit condition in the signal circuits, independent of the PCM. - 7
The conditions listed in the table may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.