Cooling Fan Control

WARNING: This page is about a different car, the 2004 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Sensors Providing ECM Inputs For Cooling Fan Control

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

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 4-step control [HIGH/MIDDLE/LOW/OFF].