DTC Set Conditions

Check conditions are when 3 minutes or more have passed since the starting sequence was completed, heated oxygen sensor (front) signal voltage has continued to be 0.2 volt or lower, engine coolant temperature is higher than 169°F (76°C), engine speed is higher than 1200 RPM, volumetric efficiency is higher than 25% and monitoring time: 7 seconds. Judgement criteria is when input voltage supplied to the ECM (M/T) or PCM (A/T) interface circuit is higher than 4.5 volts when 5 volts is applied to the heated oxygen sensor (front) output line via a resistor. The ECM (M/T) or PCM (A/T) monitors for this condition once during the drive cycle.