Oxygen Sensor Diagnosis

The control module diagnoses the fuel control heated oxygen sensors for the following conditions:

^ Heater Performance (time to activity on cold start)
^ Slow Response
^ Insufficient Switching
^ Transition Time Ratio
^ Inactive Signal (output steady at bias voltage - Approx. 450 mV)
^ Signal Fixed High
^ Signal Fixed Low

The control module diagnoses the three-way catalyst monitor heated oxygen sensors for the following conditions:

^ Heater Performance (time to activity on cold start)
^ Signal fixed High
^ Signal fixed Low
^ Inactive Sensor