ELECTRICAL FAN CONTROL [SKYACTIV-G 2.0]
2016 – MX-5 – Engine
ELECTRICAL FAN CONTROL [SKYACTIV-G 2.0]
Outline
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To improve engine reliability and cooling performance, operates the cooling fan according to the vehicle conditions and cools the radiator and condenser.
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The PCM determines the engine operation conditions based on the signal from each sensor and performs duty-control of the fan control module to control the operation time and rotation speed of the cooling fan motor.
Block Diagram
Operation
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The PCM performs duty-control of the fan control module to control the rotation speed of the cooling fan based on each demand airflow volume.
Engine coolant temperature condition
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The PCM controls the cooling fan motor rotation speed according to the engine coolant temperature.
A/C conditions
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When the A/C switch is on, the PCM controls the cooling fan motor according to the refrigerant pressure and vehicle speed. The operation conditions vary according to the engine operation conditions (refrigerant pressure and vehicle speed).
Intake air temperature condition
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The PCM control the cooling fan motor according to the intake air temperature just after it passes the air cleaner.
After cooling control
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When the engine is stopped after high-load driving, the cooling fan operates for up to 9 min under the following conditions to suppress temperature increase inside the engine compartment.
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After driving on ascending roads or continuous driving under high-load conditions
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After continuous, sudden acceleration from standstill and repeated, sudden acceleration
Conditions during collision
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If a collision signal from the SAS control module is received, the PCM stops the engine cooling fan to avoid use of battery voltage.