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