DTC Set Conditions

• More than 3 minutes have passed since the starting sequence was completed.
• Rear HO2S signal voltage has continued to be 0.15 volt or less.
• Engine coolant temperature is more than 169°F (76°C).
• Engine speed is more than 1200 RPM.
• Volumetric efficiency is more than 25 percent.
• Monitoring time is 7 seconds.

Judgement criteria is when input voltage supplied to PCM interface circuit is more than 4.5 volts when 5 volts is applied to the rear HO2S output line via a resistor. The PCM monitors for this condition once during the drive cycle.