348 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
CAN Communications (Controller Area Network)
Figure 404 Function diagram for the CAN
The funct ion diagram for the C A N includes the
following:
• Electronic Control Module (ECM)
• Drivetrain Datalink (CAN 1)
• Terminating resistors – 120 ohm
• Instrument panel (lamps)
Function
The Drivetrain Datalink is a Society of Automotive
Engineers (SAE) term referring to one of the datalinks
common to all trucks. The Drivetrain Datalink is
the communication link for the engine Electronic
Control Module (ECM), cab and chassis Electronic
System Controller (ESC), and the instrument panel.
The Drivetrain Datalink is also used for power train
communication and control.
The ECM transmits component information across
the Drivetrain Datalink to the instrument panel.
The following instrument panel components are in
constant com munication with the Dr ivetrain Datalink:
• Oil pressure gauge
• Engine oil temperature gauge
• Tachometer
• Speedometer
• Odometer / hourmeter
• Coolant temperature gauge
• Coolant level lamp
• ENGINE lamp (red)
• ENGINE lamp (amber)
•Fuelfilter lamp
• Change oil message
• Cruise / PTO control
•WAITTOSTARTlamp
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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