and OBD-I has been completely abandoned, other vehicles are generally
OBD-I and OBD-II coexist.
Electronic technology is applied to the engine management system.
In addition to basic functions such as fuel injection and ignition functions,
as well as on-board (OBD) function. When the system fails, the fault
light (MIL) or the check engine warning light (Check Engine) lights up.
At the same time, the powertrain control module (PCM) stores the fault
information in the memory, and the fault code can be read out from the
PCM through a certain program. According to the prompt of the fault
code, you can quickly and accurately determine the nature and location
of the fault, and then specifically check the relevant parts, components
and lines to eliminate the faults.
OBD II set standards. The main points of the standard are as follows：
（1）Standardized 16-pin diagnostic seats (DLC)
（2）Standardized electronic protocols
（3）Standardized diagnostic codes (DTC)
（4）Standardized technology
The OBD II system is technologically advanced and very effective in
detecting emissions problems, but OBD II is powerless to warn drivers of
whether to accept MIL warnings. To this end, OBD III system
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