Test Description

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

1. 2
   
   A normally functioning HO2S 1 voltage signal will fluctuate above and below the bias voltage amount.
2. 4
   
   A voltage reading must change from the bias amount to below the specified amount when the signal circuits are jumped to a good ground. This step checks the continuity of the signal circuits.
3. 6
   
   This step verifies that there are functional HO2S 1 heater power and ground circuits.
4. 8
   
   The conditions listed in the table may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.