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Home >> Infiniti >> 2005 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1211 To P2138 >> DTC P1217: Engine Over Temperature >> Description >> System Description >> Cooling Fan Control

Cooling Fan Control

Fig 1: Cooling Fan Control Sensor Reference Chart
G02376028Courtesy 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].

Cooling Fan Operation 

Fig 2: Cooling Fan Operation Conditions Graph
G02376029Courtesy of NISSAN MOTOR CO., U.S.A.
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