ENGINE SYSTEMS 23 EGR valve Figure 18 EGR control The EGR valve, installed in the top front of the air intake manifold, has three major components: a two head valve assembly, a DC motor, and an Integrated Circuit (IC). The IC has three Hall effect position sensors that monitor valve movement. The EGR drive module, mounted on the EGR drive module mounting bracket above the ECM/IDM assembly, controls the DC motor. Figure 17 EGR valve 1. Actuator coil 2. Valve heads (2) 3. Common shaft A DC motor, in EGR valve, moves and controls the position of a two head valve assembly.
Figure 19 EGR closed loop operation EGES295-2 Read all safety instructions in the "Safety Information" section of this manual before doing any procedures. Follow all warnings, cautions, and notes. ©2006 International Truck and Engine Corporation