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petroleum gas for use in vehicles and amending Annexes I, II, III, IV and VI thereto (Text with EEA relevance) (repealed) (c. 78)

ANNEX IV ON-BOARD DIAGNOSTIC SYSTEMS (OBD)

3. REQUIREMENTS AND TESTS

3.4. Stage 1 and Stage 2 requirements

3.4.1.

In satisfying both the Stage 1 or Stage 2 requirements the OBD system must monitor:

3.4.1.1. the fuel-injection system electronic, fuel quantity and timing actuator(s) for circuit continuity (i.e. open circuit or short circuit) and total functional failure.

3.4.1.2. all other engine or exhaust aftertreatment emission-related components or systems, which are connected to a computer, the failure of which would result in tailpipe emissions exceeding the OBD threshold limits given in the table in Article 4(3) of this Directive. At a minimum, examples include the exhaust gas recirculation (EGR) system, systems or components for monitoring and control of air mass-flow, air volumetric flow (and temperature), boost pressure and inlet manifold pressure (and relevant sensors to enable these functions to be carried out), sensors and actuators of a deNO_x system, sensors and actuators of an electronically activated active particulate filter.

3.4.1.3. any other emission-related engine or exhaust aftertreatment component or system connected to an electronic control unit must be monitored for electrical disconnection unless otherwise monitored.

3.4.1.4. In the case of engines equipped with an aftertreatment system using a consumable reagent, the OBD system must monitor for:

• lack of any required reagent

• the quality of the required reagent being within the specifications declared by the manufacturer in Annex II to Directive 2005/55/EC

• reagent consumption and dosing activity

according to section 6.5.4 of Annex I to Directive 2005/55/EC.