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OBD-II Technical Articles
A. No, I cannot. The network(s) that may be found in a specific vehicle vary widely depending on manufacturer, model, and year. I do not try to track that kind of information. It would be a monumental task and not worth it to me.

As a rule of thumb, GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). All European and most Asian imports, and some Chrysler use ISO 9141 circuitry (early Daewoo is an exception - it uses PWM). Fords and some Chryslers use SAE J1850 PWM (Pulse Width Modulation) communication patterns.

If you have first hand knowledge of other such variations, please send them in and we can build a more complete listing.

OBD-II was mandated commencing in 1996 in the USA and 2000 in Europe and most other parts of the world,. You can tell which protocol is used by examining the OBD II connector:

J1850 VPW - The connector should have metallic contacts in pins 2, 4, 5, and 16, but not 10.
ISO 9141-2 - The connector should have metallic contacts in pins 4, 5, 7, 15 (optional), and 16.
J1850 PWM -The connector should have metallic contacts in pins 2, 4, 5, 10, and 16.
J2284 CAN - The connector should have metallic contacts in pins 4, 5, 6, 14 and 16.
KWP2000 -  see ISO 9141-2

If your vehicle has this style connector, but doesn't have these pins populated, you probably have a pre-OBDII vehicle. All other pins are available for the manufacturer to use as they wish.

To add some confusion, even having the connector with the contacts shown above is not a guarantee of OBD II compliance. This style connector has been seen on some OBD II compliant vehicles. The 3.8L VR Commodore by Holden is an example. It is ALDL using OBD-II connector.

Pin 2 - J1850 Bus+
Pin 4 - Chassis Ground
Pin 5 - Signal Ground
Pin 6 - CAN High (J-2284)
Pin 7 - ISO 9141-2 K Line
Pin 10 - J1850 Bus -
Pin 14 - CAN Low (J-2284)
Pin 15 - ISO 9141-2 L Line
Pin 16 - Battery Power
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