7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 415
The EGR drive module is supplied 12 V to Pin 1 from
the ECM main power relay through Pin 10 of the 12-pin
connector. Ground is s upplied to Pin 2 from battery
ground through Pin 4 of the 12-pin connector.
The ECM sends the desired position to the EGR drive
module acros s the CAN 2 datalink. CAN 2 positive
is ECM Pin X2-6 to EGR drive modu le Pin 3. CAN 2
negative is ECM Pin X2-13 to EGR drive module Pin
4.
The EGR drive module provides a 9 V supply to the
ICfromPin12toPin1oftheEGRactuator. TheEGR
drive module provides ground to the IC from Pin 16 to
Pin5oftheEGRactuator. TheICintheEGRactuator
produces the following valve position signals:
• PositionU–EGRactuatorPin4toEGRdrive
module Pin 13
• PositionV–EGRactuatorPin3toEGRdrive
module Pin 14
• Position W – EGR actuator Pin 2 to EGR drive
module Pin 15
Depending on desired valve position from the ECM
signal and position feedback signal from the IC, the
EGR drive module drives the 3 phase D C motor
to move the valve to the proper position using the
following pulse width modulated signals:
• Motor U - EGR drive module Pin 6 to EGR
actuator Pin 8
• Motor V - EGR drive module Pin 7 to EGR actuator
Pin 7
• Motor W - EGR drive module Pin 8 to EGR
actuator Pin 6
The EGR drive module provides two shields to
suppress electrical noise. O ne shield is for the CAN 2
datalink (EGR drive module Pin 5). The other shield
is for the valve position sensor signals used by the
EGR drive module to monitor position (EGR drive
module Pin 9).
Fault Detection / Management
The EGR drive module constantly monitors the EGR
actuator. When an EGR control error is detected,
the EGR drive module s ends a message to the
ECM, a DTC is set, and the amber ENGINE lamp is
illuminated.
EGR Diagnostic Trouble Codes (DTCs)
DTCsarereadusingtheElectronicServiceTool(EST)
or by counting the flashes from the amber and re d
ENGINE lamp.
DTC 163
EGRP signal fault
• DTC 163 is set by the ECM when the EGR drive
module d etects a pos ition signal failure.
• DTC 163 can be set due to an open or short to
ground on the position sensor signal power supply
circuit, an open ground circuit, an open or short to
ground on any of the position signal circuits, or a
failed IC .
• When DTC 163 is active the amber ENGINE lamp
is illuminated.
DTC 365
EGR actuator fault detected
• DTC 365 is set by the ECM when the EGR drive
module detects an EGR actuator fault.
• DTC 365 can be set due to an open, short to
ground, short to a power source on any of the
motor signal circuits, failure of EGR actuato r
motor, or a stuck valve assembly.
• When DTC 365 is active the amber ENGINE lamp
is illuminated.
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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