9000 Hatchback L4-2290cc 2.3L DOHC Turbo EFI (1994)
Air Door Actuator / Motor: Description and Operation
Direct Current Motor, Air Recirculation Flap, ACC
Recirculation Control Motor (Direct Current Motor), Air Recirculation Flap
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The air recirculation flap is controlled by a DC motor The flap only has two positions:
100 % recirculated air
100 % fresh air.
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The air recirculation flap motor is connected to pins 2 and 21 on the ACC control module. The control module opens and closes the flap by
changing the polarity on its pins.
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To close the flap (recirculation position), pin 2 supplies approx. 12 V for 23 seconds to ensure that the flap goes to its end position.
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When the flap is to be opened, pin 21 supplies approx. 12 V for 23 seconds.
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When the flap has reached an end position, the current in the motor winding is limited by two PTC resistors incorporated in the motor. PTC stands
for Positive Thermal coefficient and - means that the resistance increases with increased temperature (the opposite of NTC).
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When the ignition is switched off, the air recirculation flap is always in the fresh air position, which is also the case during the first 60 seconds
after the ignition is switched ON.
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Automatic recirculation is not available in ECON mode.
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In AUTO mode the ACC control module selects recirculation when the outside temperature is +27 °C (80.5 °F) and above.
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If recirculation is manually selected, all other features remain unchanged.
