International VT 275 V6, Руководство пользователя

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IDM
EGR DRIVE
MODULE
ECM
X1
X2
X3
X4
4
3
2
3
ENGINE IN-LINE
12-WAY CONNECTOR
9-WAY DIAGNOSTIC
CONNECTOR
F
G
D
C
EGR
DRIVE MODULE
CONNECTOR
X1-19 CKPO X3-5
X3-28
X3-29
X1-24 CMPO X3-10
X2-6 CAN 2 (+) X3-30
X2-13 CAN 2 (-)
X3-12 CAN 1 (+)
X3-13 CAN 1 (-)
X4-20 ATA (+)
X4-21 ATA (-)
X3-31
X1
X2
X3
X1
X2
X3
X1
X2
X3
X4
TO TRANS
CONTROLLER
ECM/IDM Communications
• The ECM and IDM communicate
over three independent communi-
cation links. The three links are
CMPO, CKPO, and CAN 2. In
addition to communications with
the IDM, the ECM also sends
engine information over the CAN 1
link to the vehicle's instrument
cluster and the 9-pin
Diagnostic connector.
CAN 2
• The engine CAN 2 link is a two-
wire, bi-directional communication
circuit between the ECM and IDM
and the ECM and the EGR Drive
Module. The ECM and IDM use the
link to share operating strategies,
sensor information, diagnostic
demands, and Diagnostic Trouble
Codes (DTC). The ECM also shares
desired EGR valve position with the
EGR drive module over the CAN 2
link. The EGR Drive Module
translates those messages and
then commands the EGR valve
motor. The EGR drive module
monitors the valve action and
communicates any faults back to
the ECM over the CAN 2 link.
Cam Position Output (CMPO)
• The CMPO signal is a 0-12V digital
signal used to communicate the
camshaft position to the IDM. The
CMPO signal is a square wave
signal derived from the information
contained in the camshaft position
sensor's AC voltage signal. The
ECM generates the CMPO signal
by pulling down (switching to
ground) a single wire 12V circuit
that originates in the IDM. The IDM
reads the signal and uses it for
injector timing calculations.
Crank Position Output (CKPO)
• The CKPO signal is a 0-12V digital
signal used to communicate the
crankshaft position and speed to
the IDM. The CKPO signal is a
square wave signal derived from the
information contained in the
crankshaft position sensor's AC
voltage signal. The ECM generates
the CKPO signal by pulling down
(switching to ground) a single wire
12V circuit that originates in the
IDM. CKPO is used by the IDM for
injector timing and fuel quantity
calculations.
American Trucking Association
(ATA)
• The ATA link is a 0-5V signal that
enables communications between
the ECM and the Master-
Diagnostics software. The data
communication link also allows for
programming of the ECM and IDM.
ELECTRONIC CONTROL SYSTEM
38
International ® VT 275 V6 Engine