Introduction to On Board Diagnostics (II)

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OBD II for L & MD VehiclesSTD ManualOBD II Standards Manual:HS-3000 manual contains two sets of documents.Diagnostics Committee documentsMultiplex Committee documents.The following standards are in the Diagnostics Committee documents:SAE J 1930 Diagnostic Terms, Definitions, Abbreviations, and AcronymsSAE J 1962 OBD II Diagnostic ConnectorSAE J 1978 OBD II Scan ToolSAE J 1979 Diagnostics Test ModesSAE J 2012 Trouble Code DefinitionsSAE J 2186 Data Link SecuritySAE J 2190 Enhanced E/E Diagnostics Test ModesSAE J 2201 Universal Interface for OBD II ScanSAE J 2205 Expanded Diagnostic Protocol For OBD II Scan ToolsThe following standards are in the Multiplex Committee documents:SAE J 1850 Class B DATA Communications Network InterfaceSAE J 2178/1 Class B DATA Communications Network Messages:Detailed Header Formats & Physical Address AssignmentsSAE J 2178/2 Class B DATA Communications Network Messages :Data Parameter DefinitionsSAE J 2178/3 Class B DATA Communications Network Messages :Frame IDs For Single Byte Forms OF HeadersSAE J 2178/4 Class B DATA Communications Network Messages :Message Definitions For Three Byte Headers
OBD II for L & MD VehiclesSTD ManualOBD II has ten (10) major monitoring requirements: nine specific ic monitors and one catch all. Thenine monitors are: 1. Catalyst 2. Heated Catalyst 3. Misfire 4. Evaporative system5. Secondary Air System 6. Air Conditioning System Refrigerant (for CFC only) 7. Fuel system8. Oxygen Sensor 9. Exhaust Gas Recirculation (EGR) system. 10. Comprehensive components(sensors- inputs & actuators-outputs)outputs)The comprehensive components are mostly inputs and outputs to the powertrain which are sensors, andactuators. These have to be tested for circuit continuity, stuck k at 1 and stuck at 0 (ground) faults,and for range/performance problems, and internittent faults..OBD II has to communicate the diagnostic information to the vehicle mechanic via a communicationnetwork using diagnostic trouble codes (DTCs(DTCs).A special Connector , SAE J 1962, is used to facilitate the interface for communication.The mechanic uses Scan Tool, SAE J 1978, to collect diagnostic messages from the vehicle.The HS-3000 Manual specifies SAE standards for the above OBD II tools. Each SAE standardspecifies one particular component for compliance. The requirements for each SAE standard aredescribed below:
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Sensors and ActuatorsEmployed in OB
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Sensors and ActuatorsKnock sensorEm
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Secondary air valvesSensors and Act
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Functionality of PowertrainControl
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Introduction to On Board Diagnostics (II)

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