When Monitored

This diagnostic runs when the following conditions are met:

• Engine coolant temperature at start up and Ambient temperature are greater than 7°C (45°F).
• The difference between coolant temperature at engine start and ambient temperature is greater than 9°C (48°F).
• The O2 Heater temperature is greater than 401°C (754°F).
• Battery voltage is between 11.0 volts and 15.8 volts.