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ECM
• The ECM uses sensor inputs to control the
Injection Pressure Regulator (IPR), the
EGR valve, the boost control solenoid, the
glow plug relay and the inlet air heater
relay. The ECM also shares sensor data
with the IDM over communication links
between the two modules.
• The IDM is mounted on brackets cast into
the ECM. The ECM and IDM are then
mounted with vibration isolator grommets
to the control module assembly bracket.
The bracket is bolted to the truck's frame
directly behind the passenger side of the
cab and serves as the mounting point for
the inlet air heater relay, the glow plug relay,
and the Power Distribution Center (PDC).
IDM
• The Injector Drive Module (IDM) receives
sensor information from the ECM over
three communication links: the CAN 2 link,
the CMPO circuit, and the CKPO circuit.
The IDM uses this information to calculate
injection timing and duration. The IDM
controls injector operation through 48-volt
signals to the twin injector coils.
• The ECM has four connectors. The
connectors are called X1 through X4 with
ECM X1 being the top ECM connector as
mounted on the truck. The IDM has three
connectors with IDM X1 being the top
connector as mounted on the truck. The
ECM X1 and X2 connectors are for engine
sensor inputs and X3 and X4 are for
chassis inputs.
The IDM X1 and X2
connectors are for injector operation and
X3
is
for
chassis
communication between the ECM and IDM.
I I N N L L E E T T A A I I R R
I I N N L L E E T T A A I I R R
H H E E A A T T E E R R R R E E L L A A Y Y
H H E E A A T T E E R R R R E E L L A A Y Y
C C O O N N T T R R O O L L M M O O D D U U L L E E
C C O O N N T T R R O O L L M M O O D D U U L L E E
A A S S S S E E M M B B L L Y Y B B R R A A C C K K E E T T
A A S S S S E E M M B B L L Y Y B B R R A A C C K K E E T T
I I D D M M X X 1 1
I I D D M M X X 1 1
I I D D M M X X 2 2
I I D D M M X X 2 2
I I D D M M X X 3 3
I I D D M M X X 3 3
I I D D M M
I I D D M M
inputs
and
International
ELECTRONIC CONTROL SYSTEM
®
VT 275 V6 Engine
G G L L O O W W P P L L U U G G R R E E L L A A Y Y
G G L L O O W W P P L L U U G G R R E E L L A A Y Y
E E C C M M
E E C C M M
E E C C M M X X 1 1
E E C C M M X X 1 1
E E C C M M X X 2 2
E E C C M M X X 2 2
E E C C M M X X 3 3
E E C C M M X X 3 3
E E C C M M X X 4 4
E E C C M M X X 4 4
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