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Commission Directive 2005/78/EC of 14 November 2005 implementing Directive 2005/55/EC of the European Parliament and of the Council on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles and amending Annexes I, II, III, IV and VI thereto (Text with EEA relevance) · European Union

The following section 3.4 is added: ‘3.4. On-board diagnostic systems The application for approval of an engine equipped with an on-board diagnostic (OBD) system must be accompanied by the information required in section 9 of Appendix 1 to Annex II (description of the parent engine) and/or section 6 of Appendix 3 to Annex II (description of an engine type within the family) together with: 3.4.1.1. Detailed written information fully describing the functional operation characteristics of the OBD system, including a listing of all relevant parts of the engine's emission control system, i.e. sensors, actuators and components, that are monitored by the OBD system; Where applicable, a declaration by the manufacturer of the parameters that are used as a basis for major functional failure monitoring and, in addition: 3.4.1.2.1. The manufacturer shall provide the technical service with a description of potential failures within the emission control system that will have an effect on emissions. This information shall be subject to discussion and agreement between the technical service and the vehicle manufacturer. 3.4.1.3. Where applicable, a description of the communication interface (hardware and messages) between the engine electronic control unit (EECU) and any other powertrain or vehicle control unit when the exchanged information has an influence on the correct functioning of the emission control system. 3.4.1.4. Where appropriate, copies of other type-approvals with the relevant data to enable extensions of approvals. 3.4.1.5. If applicable, the particulars of the engine family as referred to in section 8 of this Annex. 3.4.1.6. The manufacturer must describe provisions taken to prevent tampering with and modification of the EECU or any interface parameter considered in section 3.4.1.3.’

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.