Stuart Schmitt, 10 October 2021
This is the OTC 3305-72 cable used to connect OTC Genisys, Mac Mentor, and Matco Determinator scan tools to OBD-I vehicles. The pinout/wiring diagram is below.
|1||12||Signal—ECM receive (SCI)|
|2||14||Relay control (ASD)|
|3||15||Signal—differential bus negative (CCD)|
|4||13||Signal—ECM transmit (SCI)|
|5||16||Signal—differential bus positive (CCD)|
|8||10||Signal—possibly pulldown resistance for adapter identification|