CONTROL SYSTEM
01–40–34
ELECTRICAL FAN CONTROL OUTLINE [LF]
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• Through cooling of the radiator and condenser by operation of the cooling fan according to vehicle conditions,
engine reliability and cooling performance have been improved.
• The electrical fan control includes the regular-driving cooling function and the after-cooling function.
• The regular-driving cooling function operates according to the engine conditions during the engine operation.
• The after-cooling function operates when the vehicle has stopped at high engine temperature (ignition switch
off).
• After the ignition switch is turned off, a main relay on request is sent to operate the after-cooling function. (See
01–40–11 MAIN RELAY CONTROL OPERATION [LF].)
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ELECTRICAL FAN CONTROL BLOCK DIAGRAM [LF]
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• The PCM determines the engine operation conditions based on input signals from the sensors, and sends a
signal to the cooling fan relay No.1, No.2, No.3.
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ELECTRICAL FAN CONTROL OPERATION [LF]
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• When the operation conditions are met for each function, the PCM sends an operation signal to cooling fan
relay No.1 or No.2/No.3 to operate the cooling fan motors.
• The rotation speed of the cooling fan motor is switched between three levels according to a combination of the
cooling fan relays.
• The cooling fan motor operation switches in the order of stop, low speed, middle speed, and high speed, taking
3 s for each operation while regular-driving cooling.
ECT SENSOR
VEHICLE SPEED SIGNAL
IGNITION SWITCH
COOLING FAN RELAY NO.2
PCM
TP SENSOR NO.1, NO.2
COOLING FAN RELAY NO.3
COOLING FAN RELAY NO.1
IAT SENSOR
REFRIGERANT PRESSURE
SWITCH (MIDDLE)
A/C AMPLIFER
REFRIGERANT PRESSURE
SWITCH (HIGH, LOW)
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