This part of ISO 15031 provides recommended uniformity for alphanumeric trouble codes. It further provides guidance for uniform messages associated with these codes.
It specifies several sections addressing format, structure, messages and a few examples, and is applicable to electrical/electronic systems diagnostics of motor vehicles.
Annex A specifies the diagnostic trouble code naming guidelines for signals from components, signals to components, system based diagnostics, and signals using a subfault strategy.
Annex B specifies the actual code assignments and description for powertrain system diagnostic trouble codes.
Annex C specifies the actual code assignments and description for network communication system diagnostic trouble codes, body system diagnostic trouble codes, and chassis system diagnostic trouble codes.
Annex D specifies the DTC failure category and Subtype definition of the DTC failure type byte which is an extension of a base DTC to more precisely describe the fault symptom of the DTC.