System Description

COOLING FAN CONTROL


System Description


INPUT/OUTPUT SIGNAL CHART






SYSTEM DESCRIPTION
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






Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.