FAN CONTROL MODULE CONSTRUCTION/OPERATION [MZI-3.7]
id0112d3100600
Construction
• Fan control module is installed on the radiator cowling.
Operation
• The fan control module drives the each fan motors based on the cooling fan control signals sent by the PCM according to the following:
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― Engine coolant temperature
― Vehicle speed
― Whether refrigerant pressure switch (middle) is on or off
― Whether magnetic clutch is on or off
• The fan control module allows continuously variable control of the fan motor rotation rate reducing fan operation noise and power consumption.
Single fan control module
Dual fan control module
Fail-safe function
1. Over-current fail-safe
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― If current to the fan motor exceeds the specified value, the cooling fan motor stops running for a specified period of time.
2. Over-heat fail-safe
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― If the internal temperature of the fan control module exceeds a specified temperature, the cooling fan motor stops running. (Single fan control module)
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― If the internal temperature of the fan control module exceeds a specified temperature, the cooling fan motor starts running at high speed. If the temperature continues to increase and exceeds a specified temperature, the cooling fan motor stops running. (Dual fan control module)
3. Input signal open circuit fail-safe
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― If there is an open circuit in the wiring harness between the PCM and fan control module, the cooling fan motor runs at high speed.
