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Home >> Land Rover >> 2007 >> Range Rover HSE >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Engine Controls (4.4L) >> Electronic Engine Controls (4.4L) >> Description & Operation >> Electronic Engine Controls >> Viscous Fan Control

Viscous Fan Control

The engine control module (ECM) controls a viscous coupled fan to provide engine cooling. The engine control module (ECM) supplies the fan with a pulse width modulation (PWM) signal that controls the amount of slippage of the fan, thus providing the correct amount of cooling fan speed and airflow. The EMS uses a Hall Effect sensor to determine the fan speed.

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