FAN CONTROL MODULE CONSTRUCTION/OPERATION [L3 Turbo]
id0112b3100600
Construction
• Fan control modules No.1 and No.2 are installed on the radiator cowling.
Operation
• The fan control modules No.1 and No.2 drive 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
― Battery voltage
― Whether refrigerant pressure switch 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.
Fail-safe function
1. Over-current fail-safe
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― If current to the fan motor exceeds the specified value, the coolant 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 starts running at high speed. If the temperature continues to increase and exceeds a specified temperature, the cooling fan motor stops running. (When the ignition switch is turned off, it returns to normal operation.)
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.
