Cooling Fan Control

Sensor

Input Signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed⁽¹⁾

Cooling fan control

IPDM E/R (Cooling fan relays)

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

⁽¹⁾	The ECM determines the start signal status by the signals of engine speed and battery voltage.

⁽²⁾	This signal is sent to ECM via the CAN communication line.

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].