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Home >> Toyota >> 2010 >> Matrix Base, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 36 (Engine Cooling System (2AZ-FE) (Diagnostics - Introduction)) >> Cooling Fan System >> Cooling Fan Circuit >> Description
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Cooling Fan Circuit: Description

WARNING: This page is about a different variant/trim than selected.

The ECM turns on or off the fan relays using signals calculated from the engine coolant temperature, air conditioning (ON/OFF), air conditioner refrigerant pressure, engine speed, and vehicle speed signals.

The ECM switches the circuit of the cooling fan motors between series and parallel by turning on or off the fan relays in order to control the speed of the cooling fan motors in two steps.

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