Radiator Cooling Fan: Description and Operation
ENGINE OVER TEMPERATUREDescription
SYSTEM DESCRIPTION
Cooling Fan Control
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 by 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.
COMPONENT DESCRIPTION
Cooling Fan Control Module
Cooling fan control module (1) receives ON/OFF pulse duty signal from IPDM E/R. Corresponding to this ON/OFF pulse duty signal, cooling fan control module sends cooling fan motor operating voltage to cooling fan motor. The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.
- <=: Vehicle front
- Cooling fan motor-1 harness connector (2)
- Cooling fan motor-2 harness connector (3)
Cooling Fan Motor
Cooling fan motor receives cooling fan motor operating voltage from cooling fan control module (1). The revolution speed of cooling fan motor is controlled by duty cycle of the voltage.
- <=: Vehicle front
- Cooling fan motor-1 harness connector (2)
- Cooling fan motor-2 harness connector (3)