Circuit Description

Extremely high temperatures can affect ECM, thus reducing reliability. ECM is enclosed within relay center in engine compartment. A small fan, located in left front fender, directs fresh air through relay center to reduce ECM temperature. This fan is not ECM controlled and is designed to operate in conjunction with engine cooling fans. An inoperative fan, or an obstructed airflow may allow ECM to overheat. If ECM detects it is getting too hot, this DTC will set.

Conditions required to set DTC are:

• ECM temperature is greater than 221°F (105°C), or internal temperature sensor value is less than -58°F (-50°C) or greater than 284°F (140°C).