VDO CONTISYS OBD - V3.0 Instruction Manual

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EOBD Application12Identifying compliant vehiclesAll petrol engine vehicles manufactured since 2000 should be EOBD compliant. Somemanufacturers began incorporating On-Board Diagnostic systems as early as 1994,however not all are 100% compliant. All diesel engine vehicles are expected to havesupport from 2004. This means that diagnostic information, related to vehicleemissions, may be extracted from the vehicle via the J1962 diagnostic socket usingthe service tool.The service tool can communicate with any EOBD compliant vehicle using one of thefive diagnostic communication protocols defined in the standard.These are• ISO 9141.• Keyword 2000 (originally a European protocol).• J1850 PWM (pulse width modulated) protocol used by Ford.• J1850 VPW (variable pulse width modulated) used by General Motors in USAdesigned vehicles.• CAN (controller area network) currently being legislated for and likely to be aprinciple diagnostic communication system in the future. A European protocol.It is normally possible to tell which is used on a specific vehicle by examining thediagnostic socket (as below), however the service tool's software will automaticallydetect the protocol used on the vehicle to which it is connected.Although there are different EOBD electrical connection protocols, the command setis fixed according to the SAE J1979 standard.• If the diagnostic socket has a pin in the '7' or '15'position, then the vehicle uses either the ISO9141 or Keyword 2000 protocol.• If the diagnostic socket has a pin in the '2' or '10'position, then the vehicle uses one of the SAEJ1850 protocols.• If the diagnostic socket has a pin in the '6' or '14'position, then the vehicle uses the CAN protocol.CON001916 918