Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

The hybrid/EV powertrain control module 1 determines the engine idling speed which varies based on the hybrid/EV battery pack state of charge. The engine control module (ECM) achieves throttle positioning by providing a pulse width modulated voltage to the throttle actuator motor. The throttle blade is spring loaded in both directions and the default position is slightly open. The hybrid/EV powertrain control module 1 can detect a condition where the engine is cranking but does not start or has stalled or if the engine speed does not match the commanded speed.

The throttle actuator control (TAC) motor is controlled by the ECM. The DC motor located in the throttle body drives the throttle blade. In order to decrease engine speed, along with spark and fuel delivery changes the ECM commands the throttle closed reducing air flow into the engine and the engine speed decreases. In order to increase engine speed, the ECM commands the throttle plate open allowing more air to pass the throttle plate. If the hybrid/EV powertrain control module 1 detects the actual engine speed is not within a predetermined range of the commanded engine speed, this DTC sets.