Circuit Description
WARNING: This page is about a different variant/trim than selected.
PCM monitors Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this period, PCM counts number of times that HO2S switches from rich-to-lean and lean-to-rich. When PCM determines that HO2S does not switch enough times, DTC will set.
A lean-to-rich switch is determined when HO2S voltages changes from less than 300 mV to greater than 600 mV. A rich-to-lean switch is determined when HO2S voltage changes from greater than 600 mV to less than 300 mV. DTC will set when PCM determines that within 100 seconds the HO2S lean-to-rich and rich-to-lean switches are less than 10.