9-3 FWD (9440) L4-2.0L Turbo (B207R) (2009)
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The throttle is rotated by a brushless throttle motor that is fed 600 Hz PWM from control module pins 64(B), 47(B), 46(B) and 63(B).
The control module can rotate the throttle in either direction by reversing the polarity of the motor. The PWM ratio increases as the throttle moves
farther away from the desired value.
Two throttle control sensors are connected to the throttle spindle. The sensors consist of potentiometers that are supplied 5 V from control module pin
30(B) for sensor 1 and 31(B) for sensor 2. They are grounded from control module pins 34(B) and 35(B).
Voltage from sensor 1 is connected to control module pin 28(B) and increases with the throttle position.
Voltage from sensor 2 is connected to control module pin 25(B) and decreases with the throttle position. The total of the two sensor voltages is always
approx. 5 V. Voltage from sensor 1 is used by the control module as the value of the actual throttle position.
In the event of a serious fault in throttle control, it is switched off and the control module goes into limp-home mode.
