TECHNICAL DESCRIPTION OF OBD-I AND -II (CONT.)
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The Federal Clean Air Act Amendments of 1990 requires that all
vehicles sold in the United States meet OBD-II requirements by the
1996 model year. The first OBD-II systems appeared on selected
vehicle types in 1994.
Some important OBD-II requirements are: Vehicle service
information available to all technicians; Standardization of Terms:
Use of SAE J-1930 recommended terms; OBD-II requires a
common Diagnostic Link Connector (DLC) and specifies its location
in the vehicle; Generic scan tool; Generic emission related
Diagnostic Trouble Codes (DTC); and a very specific Malfunction
Indicator Light (MIL) illumination protocol.
One very important part of the OBD-II requirements is that
technical service information for emissions related components and
systems, which could affect the vehicle's emission levels, will be
available to all technicians; not just OEM dealership technicians.
This will allow all technicians to better understand how the systems
recognize faults and set the DTCs. The technician can now make a
repair and verify the repair by exactly duplicating the criteria that is
required for the DTC to be set.
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