Operation

The ECM controls the cooling fan speed in accordance with the value of the engine coolant temperature, as shown in the graph below. When the engine coolant temperature is higher than a specific value, the control differs depending on whether the engine speed is at idling and below or more.

Fan Speed (Control Voltage)

Fan Speed (Control Voltage)

More than Idling At Idling or below

Engine Coolant Temperature

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The ECM controls the cooling fan speed in accordance with the value of the air conditioning refrigerant pressure, as shown in the graph below. When the air conditioning refrigerant pressure is higher than a specific value, the control differs depending on whether the engine speed is at low speeds and below or more.

Fan Speed (Control Voltage)

At Low Speeds or Below

More than Low Speeds

Fan Speed (Control Voltage)

Air Conditioning Refrigerant Pressure

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