FAN CONTROL MODULE CONSTRUCTION/OPERATION [MZI-3.7]

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Construction

• Fan control modules No.1 and No.2 are installed on the radiator cowling.

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Operation

• The fan control modules No.1 and No.2 drive the each cooling fan motors based on the cooling fan control signals sent by the PCM. (See ELECTRICAL FAN CONTROL OUTLINE [MZI-3.7].)
• The fan control module allows continuously variable control of the cooling fan motor rotation rate, reducing fan operation noise and power consumption.

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Fail-safe function

1. Over-current fail-safe

  ― 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

  ― 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.

3. Input signal open circuit fail-safe

  ― 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.