FAN CONTROL MODULE CONSTRUCTION/OPERATION [L3 Turbo]SM1934375
FAN CONTROL MODULE CONSTRUCTION/OPERATION [L3 Turbo]
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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 [L3 Turbo].)
• The fan control module allows continuously variable control of the cooling fan motor rotation rate, reducing fan operation noise and power consumption.
• Based on the input signals from the control parts, the cooling fan may remain operational for several seconds or minutes after the ignition switch is turned off. (See
ELECTRICAL FAN CONTROL OUTLINE [L3 Turbo].)
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Fail-safe function
The fan control module has a power supply function to operate the cooling fan motor and the following protection functions.
1.Over-current fail-safe
― If current to the cooling fan motor exceeds the specified value, the fan control module stops the cooling fan motor 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. (When the ignition switch is turned off, it returns to normal operation.)
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.
