DTC Set Criteria

After engine starts, front HO2S signal is 0.2 volt or less for 3 minutes or more. Engine coolant temperature is more than 180°F (82°C). Engine speed is more than 1200 RPM. Volumetric efficiency is more than 25 percent. Code will then set when input voltage supplied to Engine Control Module/Powertrain Control Module (ECM/PCM) interface circuit is more than 4.5 volts when 5 volts are applied to HO2S output line through a resistor. Monitor runs only once during drive cycle.