Circuit/System Description

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

The ECM uses the exhaust gas recirculation (EGR) position sensor to determine the position of the EGR valve. The engine control module (ECM) sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the EGR valve position, is sent from the sensor to the ECM through the EGR position sensor signal circuit. The ECM compares the actual EGR position with the desired EGR position when the EGR valve is commanded open or closed.

The EGR valve is controlled by the ECM through the EGR motor high control and the EGR motor low control circuits. The ECM will pulse width modulate the low control circuit to ground when EGR is desired.