Air Intake Control
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The source of intake air is automatically controlled unless overridden by pressing the air recirculation switch located below the TSD. Under automatic control, the ATC module determines the required position of the recirculation door from its 'comfort' algorithm and, if fitted, the pollution sensor.
The recirculation door is operated by an electric motor. The ATC module provides analogue signals to the motor along a hardwired connection. A potentiometer in the motor supplies the ATC module with a position feedback signal for closed loop control.