Circuit/System Description

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

The position of the intake manifold swirl flaps is controlled by the engine control module (ECM). The ECM controls the intake manifold runner control valve actuator to create a swirl in the combustion chamber to get a homogeneous diesel air mixture.

Ignition voltage is supplied directly to the intake manifold tuning valve actuator. The engine control module (ECM) controls the valve actuator motor by grounding the control circuit with a solid state device called a driver. The driver is equipped with a feedback circuit that is pulled up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a voltage by monitoring the feedback voltage signal.

The runner control valve actuator contains a position sensor, which outputs a pulse width modulated (PWM) signal, to detect the actual position of the actuator in relation to its commanded position. Variations in the duty cycle of the PWM signal enables the ECM to detect a physically broken, restricted or stuck actuator.