For California

COOLING FAN CONTROL


System Description


INPUT/OUTPUT SIGNAL CHART






SYSTEM DESCRIPTION
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 4-step control [HIGH/MID/LOW/OFF].

Cooling Fan Operation






Cooling Fan Relay Operation
The ECM controls cooling fan relays through CAN communication line.