Chapter 5
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Chapter 5 - 3
B. Generic OBD2 and Enhanced OBD2
1.
Generic OBD2
a. OBD2 was implemented for the emission control. Therefore, the
standardization is limited to powertrain system that is directly related to
emission control. It is not mandatory for the other systems such as ABS
and SRS
b. Not all the trouble codes and data stream variables are standardized,
also. A list of trouble codes and data stream variables that are closely
related to emission control are defined as OBD2 standards, however, it
also allows more codes and variables reserved for car make’s own
definition and usage. These standardized parts of trouble codes and
data stream variables are so called Generic OBD2. Generic OBD2
application is limited to emission related systems and so is the diagnostic
readouts
2.
Enhanced OBD2
a. Generic OBD2 has limited availability for overall diagnosis, however, an
actual car has a lot more than this. The control systems other than
powertrain are not included in the mandatory OBD2 regulations, and
each car make has different trouble code and data stream definitions for
the reserved non-standard fields of powertrain system.
b. The scope of on board diagnostic system that OBD2 standard features
do not cover is called Enhanced OBD2.
3.
Manufacturer’s OBD
a. Many of Non-USA cars of 1996 model-year or later have an OBD2 16Pin
adapter, however the communication with scanners does not follow
standardized OBD2 protocols.
b. These car makes maintain their own communication features that are not
