Circuit Description

The engine control module (ECM) opens the throttle blades by applying a pulse width modulated voltage to the throttle valve motor. The ECM reverses the polarity on the throttle valve motor control circuits in order to close the throttle blades. The ECM increases the pulse width as necessary to open the throttle blades. The ECM monitors the voltage on the motor control circuits. If the ECM detects the voltage on the motor control circuits are not within a predetermined value, DTC 2100 sets.