MODES EGR Measurement EGR Mode Once EGR begins flow through the EGR cooler and past the venturi, pressure levels are measured from the two venturi taps or ports. The delta pressure measurement, in conjunction with the EGR temperature, determines the EGR flow rate. 3-8 All information subject to change without notice. (Rev. April 2004) 7SE60 0404 Copyright © 2004 DETROIT DIESEL CORPORATION