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FX4000 Full System Scan Tool
2. General Information
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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