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Definitions
• EOBD: European On-Board
Diagnostics
Essentially the same as OBD II, with
the same Data Link Connector and
Communication Protocols.
• Communication Protocol: Allows
different systems and sensors in a
vehicle to communicate.
There are currently five Protocols:
CAN Bus
J1850 VPW
ISO 9141-2
J1850 PWM
ISO 14230 KWP
• CAN: Controller Area Network
Message-based Communication
Protocol serial bus.
• CAN Vehicle
2008 and newer.
• Pre-CAN Vehicle
2007 and older.
• DLC: Data Link Connector
The 16-cavity connector on the vehicle
that allows communication between the
computer system and the Scan Tool.
Control Modules
Control Modules are individual computers that operate and monitor different
systems in the vehicle. Control Modules vary depending on manufacturer.
ID codes are assigned to each Control Module, which are
defined by the vehicle's Communication Protocol.
For example, a vehicle may use ID code $7E8 for the PCM and $7E9 for the TCM.
Control Module
PCM/ECU
TCM
Page 6
Powertrain Control Module/Engine Control Unit
Transmission Control Module
Figure A: Common Control Modules
For technical questions, please call 1-888-866-5797.
• Drive Cycle
A set of driving procedures that,
when met, provide the Enabling
Criteria for the I/M Monitors to run
and complete their diagnostic tests.
• Enabling Criteria
Operating conditions that must
occur during a Drive Cycle to
cause the I/M Monitors to run and
complete their diagnostic tests.
• MIL: Malfunction Indicator Lamp
The vehicle's "Check Engine"
warning light that activates
when a DTC is stored.
• DTC: Diagnostic Trouble Code
A code stored in the computer
system's memory, which helps to
identify the fault condition that is
causing the MIL to activate.
• Freeze Frame Data
Operating conditions that are
stored when a DTC is stored.
• PID - Parameter Identification Data
Data returned by the vehicle's
Control Modules to the Scan Tool.
Control Module Definition
Item 62120
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