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Home >> Infiniti >> 2010 >> FX35 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Control System (VK50VE) - Diagnostic Introduction) >> Function Diagnosis >> Cooling Fan Control >> System Description >> System Description

System Description

WARNING: This page is about a different car, the 2010 Infiniti FX50. However, it is still accessible from the selected car via links, so may be relevant.

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, air conditioner ON signal, refrigerant pressure, target A/C evaporator temperature and A/C evaporator temperature.

Cooling fan control signal is sent to IPDM E/R from ECM via the CAN communication line. Then, IPDM E/R sends ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty signal, cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan speed is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.

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