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FX Series Full System Scan Tool
5
2.1
On-Board Diagnostics (OBD) II
The first generation of On-Board Diagnostics (OBD I) was
developed by the California Air Resources Board (ARB) and
implemented in 1988 to monitor some of the emission control
components on vehicles. As technology evolved and the desire
to improve the On-Board Diagnostic system increased, a new
generation of On-Board Diagnostic system was developed. This
second generation of On-Board Diagnostic regulations is called
"OBD II".
The OBD II system is designed to monitor emission control
systems and key engine components by performing either
continuous or periodic tests of specific components and vehicle
conditions. When a problem is detected, the OBD II system turns
on a warning lamp (MIL) on the vehicle instrument panel to alert
the driver typically by “Check Engine” or “Service Engine Soon”.
The system will also store important information about the
detected malfunction so that a technician can accurately find and
fix the problem.
Here below three pieces of such valuable information:
1)
Malfunction Indicator Light (MIL) is commanded as 'ON' or
'OFF';
2)
Diagnostic Trouble Codes (DTCs) are stored;
3)
Readiness Monitor status.
2.2
Diagnostic Trouble Codes (DTCs)
OBD II Diagnostic Trouble Codes are codes that are
stored by the on-board computer diagnostic system in
response to a problem found in the vehicle. These codes
identify a particular problem area and are intended to
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