ISO 15031-3-2023 PDF

Full title and description

St ISO 15031-3-2023 — Road vehicles — Communication between vehicle and external equipment for emissions-related diagnostics — Part 3: Diagnostic connector and related electrical circuits: Specification and use. This part specifies the physical diagnostic connector (data link connector) and associated electrical circuits and pin usage required for standardized access to OBD (on-board diagnostics) information by external test equipment.

Abstract

This document references the latest SAE J1962 recommended practice and describes the minimum requirements for the diagnostic connector used for emissions-related diagnostics, including physical connector specification, pin assignment and related electrical circuit requirements. It is technically equivalent to SAE J1962 except where the standard identifies specific differences or additional requirements (notably some requirements for right-hand-drive vehicles).

General information

• Status: Published.
• Publication date: 6 February 2023 (Edition 3, 2023-02).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.180 (Diagnostic, maintenance and test equipment); 13.040.50 (Transport exhaust emissions); 43.040.10 (Electrical and electronic equipment).
• Edition / version: Edition 3 (2023).
• Number of pages: 4 (concise technical specification).

Scope

Specifies the diagnostic connector physical form, pin allocations and the associated electrical circuits required to provide a standardized interface between a vehicle and external test equipment for emissions-related diagnostics. The standard ensures interoperability of external test equipment with OBD-equipped vehicles and cross-references SAE J1962 for connector details while including ISO-specific requirements (including provisions related to right-hand-drive vehicles). It applies to road vehicles required to provide OBD access for emissions diagnostics.

Key topics and requirements

• Specification of the diagnostic connector physical dimensions and mating requirements (Data Link Connector / DLC).
• Standard pin assignment and signal definitions for emissions-related diagnostic access.
• Requirements for related electrical circuits, power and signal reference connections used during diagnostics.
• Equivalence and references to SAE J1962, with ISO-identified exceptions and additional RHD requirements.
• Intended use for short-term diagnostic connection by external test equipment (OBD access and testing).

Typical use and users

Used by automobile manufacturers (vehicle electrical and diagnostic teams), OBD/external test equipment designers and manufacturers, aftermarket scan tool vendors, emissions test laboratories, type approval and regulatory agencies, and service/repair organisations that require standardized physical and electrical connector specifications to develop interoperable diagnostic/test equipment and procedures.

Related standards

Part of the ISO 15031 series for vehicle↔external equipment communications (examples include ISO 15031-1:2010 for general information and use cases, ISO 15031-2:2010 for terminology and guidance, ISO 15031-4 (external test equipment) and ISO 15031-5 (emissions-related diagnostic services)). These parts are typically referenced together when implementing OBD communications and diagnostic tools.

Keywords

OBD, diagnostic connector, data link connector (DLC), SAE J1962, pin assignment, emissions diagnostics, vehicle-to-external communication, diagnostic electrical circuits, RHD requirements, ISO 15031 series.

FAQ

Q: What is this standard?

A: ISO 15031-3:2023 is the international standard that specifies the diagnostic connector and related electrical circuits used for emissions-related on-board diagnostics (OBD) access between a vehicle and external test equipment.

Q: What does it cover?

A: It covers the physical connector specification, pin assignments and associated electrical circuit requirements necessary to ensure standardized access to vehicle OBD data for emissions testing and diagnostics; it references SAE J1962 and includes ISO-specific requirements.

Q: Who typically uses it?

A: Vehicle manufacturers, diagnostic and test equipment manufacturers, emissions test labs, regulatory bodies, and aftermarket service/tool providers use this standard to ensure connector and electrical interoperability for OBD access.

Q: Is it current or superseded?

A: Current — ISO 15031-3:2023 (Edition 3) was published in February 2023 and supersedes earlier editions (including the 2016 edition).

Q: Is it part of a series?

A: Yes — it is one part of the ISO 15031 series, which includes other parts covering general information/use cases (Part 1), terminology (Part 2), external test equipment (Part 4) and emissions-related diagnostic services (Part 5), among related technical reports and annexes.

Q: What are the key keywords?

A: OBD, diagnostic connector, SAE J1962, DLC, pinout, emissions diagnostics, external test equipment, electrical circuits, ISO 15031.