Oxygen Sensor Diagnosis

Diagnose the fuel control heated oxygen sensors for the following conditions:

• The heater performance-the time to activity during a cold start
• A slow response
• The response time-the time to switch R/L or L/R
• The inactive signal-the output should steady at a bias voltage of approximately 450 mV
• A signal fixed high
• A signal fixed low

Diagnose the catalyst monitor heated oxygen sensors for the following functions:

• The heater performance-the time to activity during a cold start
• A signal fixed low during steady state conditions
• An inactive sensor