Circuit Description

The engine control module (ECM) opens the throttle valve by applying a pulse width modulated voltage to the throttle actuator control motor. The ECM reverses the polarity on the throttle actuator control motor control circuits in order to close the throttle valve. The ECM increases the pulse width as necessary to open the throttle valve. The ECM monitors throttle position (TP) sensors 1 and 2 to determine the actual throttle valve position. If the ECM detects that the output driver for the throttle actuator control (TAC) motor does not deactivate when commanded OFF, this DTC sets.