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SAFETYMAINTENANCE SETUPOPERATION OVERVIEW
Overview
OBD II On-Board Diagnostics
It is required by the EPA that all 1996 and
newer vehicles sold in the United States be
equipped with an OBD II computer system�
OBD II is an early warning system designed to
monitor engine, transmission, and emissions control
components by performing specific diagnostic tests�
When a fault condition is detected, the system captures
important data and activates the “Check Engine” light�
If the light comes on, the vehicle might have a
condition that wastes fuel, shortens engine life, or
causes excessive air pollution� If the problem that
caused the light to come on is addressed, for instance
a loose gas cap is tightened, the light will go out�
If the light comes on and stays on, a minor
engine fault condition is occurring and should
be addressed as soon as possible
If the light is blinking, a severe engine fault condition
is occurring and should be addressed immediately�
The Scanner connects to the vehicle’s
computer system and captures information
that can help identify the fault condition�
Vehicle Coverage
This Scanner is designed to work with
all OBD II compliant vehicles, including
those equipped with a CAN bus�
OBD II was installed in some 1994 and
1995 model year gasoline vehicles�
To verify if a 1994 or 1995 vehicle is OBD II compliant,
check the Vehicle Emissions Control Information
label, which is located in the engine compartment�
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 Scanner�
• 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�
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