Introduction to On Board Diagnostics (II)

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OBD II for L & MD VehiclesSTD ManualOBD II diagnostics are required to comply with SAE standards listed in the Hs-3000manual. They relate to the following areas:SAE J 1930 defines the diagnostic terms applicable to electrical/electronic systems, includingmechanical terms, definitions, abbreviations, and acronyms. These e terms only should be used by OBD II.The standard will be continuously updated by SAE for compliance by OBD II in future.All documents related to emission-related vehicle and engine service procedures shall conform to the emission relatednomenclature and abbreviations provided in SAE J 1930. This also applies to all new documents printed or updated by amanufacturer starting 1993 model year.Common names for components and systems are recognized as beneficial for technicians working on multiple models ofvehicles. Powertrain terms are approved in 1993. The standard is updated periodically y by the task force.SAE J 1962 defines minimum set of diagnostic connector requirements ents that all diagnostic toolsmust satisfy to perform OBD II monitoring and diagnostic functions on board the vehicle.SAE J 1962 is a 16 pin connector located under the instrument panel on the driver side of the vehicle.The pin assignments are specified in the standard for SAE J 1850 serial data link (2 pins), Battery power (pin 16), Battery ground,Signal Ground (pin 5), and ISO 9141 serial data link (2 pins). Connector Cterminals 2,7,10, and 15 must be compatible with theassignment and use of their mating terminal in the vehicle connector. Chassis ground is pin 4 and is defined in SAE J 2201.Battery ground must be noise free and a clean signal ground. These are intended for compliance through out the motor vehicleindustry. The SAE standards are under the control and maintenance e of the Vehicle E/E System Diagnostics Committee.
OBD II for L & MD VehiclesSTD ManualThe salient features of the SAE J 1962 standard that specifies the tOBD II’s diagnostic connector are:Consistent location in the vehicle’s instrument Panel (IP), Easeof access to technician, Ease of Visibility to the technician, and aEase of attachment of equipment without affecting normalvehicle operation.The Connector design must be compatible with previousvehicle configurations, must meet the electrical (10 A DC), andmechanical specification of material, shape, matingrequirements, and terminal assignments.
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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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