Serial Data Communications

The Chevrolet Metro utilizes the International Organization for Standardization (ISO [9141-2]) communications system. ISO (9141-2) specifies the requirements for setting up the interchange of digital information between the on-board emission-related engine control modules of road vehicles and the OBD II scan tool as specified in J1978. This communication is established to facilitate compliance with California Code of Regulation. The most significant result of this regulation is that the regulation provides the scan tool manufacturers with the capability of accessing data from any make or model vehicle.