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In this position, the pulsations are only determined by the short intake pipe's geometry. The total volume for all cylinders now accessible is necessary to have sufficient access to air. Torque Development Item Part Number Description 1 - Both throttles closed 2 - Only the lower throttle open 3 - Both the throttles open 4 - Official torque curve By combining the throttle's position, in principle, three different torque curves are produced, which combined, give a flat Throttle Units (Actuators) Item Part Number Description 1 - Upper throttle unit 2 - Lower throttle unit The throttle units consist of throttle, Direct Current (DC) motor, worm gear and internal electronics. The Engine Control Module (ECM) controls the position of the throttle by modulating the relevant throttle unit's control Electronic Engine Controls (303-14A Electronic Engine Controls - I6 3.2L Petrol, Description and Operation). If an actuator fails and the flap is in the open position, it is not possible to remove the actuator and flap assembly from |