Oxygen Sensor: Testing and Inspection

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 Sensor (output steady at bias voltage - approximately 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.