Cooling Fan Control

Fig 1: Sensor & Input Signal To ECM Reference Chart

Courtesy of NISSAN MOTOR CO., U.S.A.

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signals is sent to ECM through CAN communication line.

The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].