A standard reference for the definition of OBD. Different yards have different definitions, and it seems that there is no uniformity.
The different line sequences of ODB to db9 seen on a certain treasure:
1) The pins of 1/2/3/6 are the same, and the upper and lower pins correspond to each other.
2) One of the 4/5/7/8 also corresponds up and down; the other 4-5, 12-13, 7/8 and 15/16 are cross-connected.
3) In addition to the following 2 groups, there are other line sequences, which basically include combinations of 6-14.
4) The connection of db9 to 7-2 is fixed, corresponding to CANH - CANL, and can be directly connected to the can box.
OBD pin definition reference
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Origin blog.csdn.net/yinminsumeng/article/details/132169869
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