Oxygen Sensor Diagnosis

Primary System Based Diagnostics

There are primary system based diagnostics which evaluate the system operation and their effect on vehicle emissions. The primary system based diagnostics are listed below with a brief description of the diagnostic functionality.

Oxygen Sensor Diagnosis

Diagnose the Fuel Control Heated Oxygen Sensors for the following conditions:
^ Heater Performance (time to activity on cold start)
^ Slow Response
^ Response Time (time to switch R/L or L/R)
^ Inactive Signal (output steady at bias voltage approximately 450 mV)
^ Signal Fixed High
^ Signal Fixed Low

Diagnose the Catalyst Monitor Heated Oxygen Sensors for the following functions:
^ Heater Performance (time to activity on cold start)
^ Signal fixed low during steady state conditions.
^ Inactive Sensor.