Oxygen Sensor Diagnosis

Diagnose the Fuel Control Oxygen Sensors (O2S) for the following conditions:

^ 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 (HO2S) for the following functions:

^ Heater Performance (time to activity on cold start)

^ Signal fixed low during steady state conditions or power enrichment (hard acceleration when a rich mixture should be indicated)

^ Signal fixed high during steady state conditions or decel fuel mode (deceleration when a lean mixture should be indicated)

^ Inactive Sensor (output steady at approximately 438 mV)