ThisdocumentsupersedesSAEJ1979SEP1997,andistechnicallyequivalenttoISO/DIS15031-5:April30,2002,exceptforminorreorganisationofParagraphs1and2.Foreword—On-BoardDiagnostic(OBD)regulationsrequirepassengercars,andlightandmediumdutytrucks,tosupportcommunicationofaminimumsetofdiagnosticinformati