ISO DIS 15031-6: Road vehicles - Communication between vehicle and external equipment for emissions-related diagnostics - Part 6: Diagnostic trouble code definitions
DOD Adopted ANSI Approved Approved
This part of ISO 15031 provides uniformity for standardized Diagnostic Trouble Codes (DTC) that electrical/electronic On-Board Diagnostic (OBD) systems of motor vehicles are required to report when malfunctions are detected. It further provides guidance for uniform messages (text descriptor) associated with these codes.
This document specifies the rules and guidelines for the definition of:
a) The Diagnostic Trouble Code format, which consists of:
1) Addressing format;
b) A description of the standardized set of Diagnostic Trouble Codes and descriptions contained in SAE J2012-DA. The two most significant bytes of a DTC may be decoded according to two different lists in two formats; DTC Format Identifier 0x00 and 0x04.
c) A description of the standardized set of Diagnostic Trouble Codes subtypes known as Failure Types contained in SAE J2012-DA (applies only when three byte DTCs are used);
This part of ISO 15031 specifies all general rules and guidelines to define new Diagnostic Trouble Codes. This part of ISO 15031 references the SAE J2012-DA (Digital Annex), which includes all standardized DTCs (number and text descriptor) as well as all Diagnostic Trouble Codes subtypes known as Failure Types.
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