System Description (M/T Models)

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 2-step control [HIGH/OFF].

Cooling Fan Operation

Fig 1: Cooling Fan Vehicle Speed Graph

Courtesy of NISSAN NORTH AMERICA, INC.

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.