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COOLING FAN CONTROL EC-987 < SYSTEM DESCRIPTION > [VQ40DE FOR MEXICO] C D E F G H I J K L M A EC N P O COOLING FAN CONTROL Description INFOID:0000000009481687 SYSTEM DESCRIPTION Cooling Fan Control *1: The ECM determines the start signal status by the signals of engine speed and battery voltage. 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 3-step control [HIGH/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. Sensor Input Signal to ECM ECM function Actuator Crankshaft position sensor (POS) Engine speed* 1 Cooling fan IPDM E/R Battery Battery voltage* 1 Wheel sensor Vehicle speed* 2 Engine coolant temperature sensor Engine coolant temperature Air conditioner switch Air conditioner ON signal* 2 Refrigerant pressure sensor Refrigerant pressure PBIB2531E Cooling fan speed Cooling fan relay LO HI Stop (OFF) OFF OFF Low (LOW) ON OFF High (HI) ON ON |