Sunfire L4-144 2.4L DOHC VIN T SFI (2001)
Oxygen Sensor: Description and Operation
Oxygen Sensor Diagnosis
Diagnose the fuel control Oxygen Sensors (O2S) for the following conditions:
^
A slow response
^
Response time, time to switch R/L or L/R
^
An inactive signal, output steady at bias voltage-approximately 450 mV
^
A signal fixed high
^
A 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