414 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
The EGR drive module controls the EGR actuator and
is located on the left side of the engine on the ECM
and Injector Driver Module (IDM).
The EGR actuator is a variable position valve that
controls the amount of exhaust entering the intake
system. The ECM uses sensor input from the
BAP, EBP, MAT, MAP, APS, EOT, ECT, and VGT
control to calculate the desired position of the EGR
actuator. The EGR driv e module receives the desired
EGR actuator position from the ECM across the
CAN 2 datalink to activate the valve for exhaust
gas recirculation. The EGR drive module provides
feedback to the ECM on the valve position. The
EGR drive module interprets the ECM command
and sends the c ommand using three pulse width
modulated signals to the valve actuator.
The system is closed loop control using the EGR
position signals. The EGR drive module provides a
9 V supply and ground to the IC in the motor of the
valve. When the EGR drive m odule directs the valve
to move, the IC with three Hall effect sensors provides
the EG R drive module with t he valve position signals.
The EGR drive module interprets the three signals to
determine valve position and sends the information
back to the ECM.
EGR Circuit Operation
Figure 442 EGR circuit diagram
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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