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Engine Cooling Fan System (Diagnostics & Circuit Tests): Overview Scion FR-S I

Cooling Fan 3 illustrations

Scheme 71

Scheme 71: ILLUSTRATION
Scheme 71: ILLUSTRATION

Scheme 72

Scheme 72: ILLUSTRATION
Scheme 72: ILLUSTRATION

Scheme 73

Scheme 73: SYSTEM DIAGRAM [07/2013 - ]
Scheme 73: SYSTEM DIAGRAM [07/2013 - ]

DESCRIPTION

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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