Introduction to On Board Diagnostics (II)
Introduction to On Board Diagnostics (II)
Introduction to On Board Diagnostics (II)
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<strong>Introduction</strong> <strong>to</strong> <strong>On</strong> <strong>Board</strong><strong>Diagnostics</strong> (<strong>II</strong>)OBD <strong>II</strong> is an onboard diagnostics and service methodology.OBD <strong>II</strong> mandates a standard scan <strong>to</strong>ol (SAE J 1978) with a single standardplug for all vehicles manufactured in U.S.A.Diagnostic test modes (SAE J 1979) include:uFault Fault code handlingu“Readiness” codesuReal Real time vehicle informationu“Freeze “Freeze Frame” information.Standard nomenclature for all OBD <strong>II</strong> codes (SAE J 1930) is mandated.OBD <strong>II</strong> standardizes on most Trouble Codes (TC) for vehiclemalfunctions identified by regions, such as powertrain, , body, etc.OBD <strong>II</strong> standardizes on number of sensor readings, messageformats, message priorities, etc. for all vehicles.
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