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2. DESCRIPTION OF TEST

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 testing of OBD systems consists of the following phases: simulating the malfunction of a component of the engine management or emission control system as described in section 1.1 of this Appendix preconditioning of the OBD system with a simulated malfunction over the preconditioning cycle specified in section 6.2 operating the engine with a simulated malfunction over the OBD test cycle referred to in section 6.1 determining whether the OBD system reacts to the simulated malfunction and indicates malfunction in an appropriate manner. 2.1.1. Should the performance (e.g. power curve) of the engine be affected by the malfunction, the OBD test-cycle remains the shortened version of the ESC test-cycle used for the assessing the exhaust emissions of the engine without that malfunction. 2.2. Alternatively, at the request of the manufacturer, malfunction of one or more components may be electronically simulated according to the requirements of section 6. 2.3. Manufacturers may request that monitoring take place outside the OBD test cycle referred to in section 6.1 if it can be demonstrated to the authority that monitoring during conditions encountered during this OBD test cycle would impose restrictive monitoring conditions when the vehicle is used in service.

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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.