Page Comparison

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ISO 15031: protocol for communication between a vehicle (through the OBD port/connector) and an external diagnostic equipment for emissions related diagnostics.
SAE J1939-13: round diagnostic connector may support OBD-II data on heavy duty vehicles for sales in the USA after 2010.
Here are some of the common part numbers in the HD10 series now by TE Connectivity (formerly by Deutsch Connectors):
- HD10-9-1939P: receptacle flange
- HD14-9-1939P: receptacle inline
- HD16-9-1939S: plug
- HD17...: no bayonet ring
SAE J1962: hardware interface (connector, female = receptacle, 16-pin (2x8), D-shaped)
- type A: 12 V vehicles (full middle groove)
- type B: 24 V vehicles (interrupted middle groove)
- common with passenger cars (11 bit headers)
- used by some heavy duty trucks in North America (29 bit CAN identifiers)
SAE J1979: defines many OBD-II PID's.

Data bases

PID = parameter IDentifier by WikiPedia
List of OBD-II compatible vehicles by Outils OBD Facile;
you can check which parameters can be transmitted from your car to an OBD-II device.