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EOBD Application
13
Diagnostic Trouble Codes
Diagnostic Trouble Codes (DTCs) are divided into mandatory and voluntary codes.
Mandatory codes are allocated by the ISO (International Standards Organisation) /
SAE (Society of Automotive Engineers). Voluntary codes are allocated by various
vehicle manufacturers and are manufacturer specific and in some instances, vehicle
specific.
ISO/SAE controlled diagnostic trouble codes are those codes where industry
uniformity has been achieved. These codes were felt to be common enough across
most manufacturer's applications that a common number and fault message could be
assigned. All unspecified numbers in each grouping have been reserved for future
growth. Although service procedures may differ widely amongst manufacturers, the
fault being indicated is common enough to be assigned a particular fault code. Codes
in this area are not to be used by manufacturers until they have been approved by ISO/
SAE.
Areas within each of the fault code blocks have been allocated for manufacturer
controlled DTCs. These are fault codes that will not generally be used by the majority
of the manufacturers due to basic system differences, implementation differences, or
diagnostic strategy differences.
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