This page presents the wiring you would expect to find on a 12-pin diagnostic port connector like those found on 1G DSMs and EVO1-3 cars.

The following 3 wires are the wires used by the ECMLink datalogging cable.

The “front side” view is looking at the diagnostic connector in the car with the male pins pointing out at you. The “reverse side” view is looking at the connector end of our cable (looking “into” the female sockets).