Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p32
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 32/59)
Character Range: 693894–697104

the deNOx system, where fitted, with respect to the emissions of NOx only.

             3.3.2.3. reduction in the efficiency of the particulate filter, where fitted, with respect to the emissions of particulate only.

             3.3.2.4. reduction in the efficiency of a combined deNOx-particulate filter system, where fitted, with respect to both the emissions of NOx and particulate.

             3.3.2.5. the interface between the engine electronic control unit (EECU) and any other powertrain or vehicle electrical or electronic system (e.g. the trans- mission control unit (TECU)) for electrical disconnection.

             3.3.3. Manufacturers may demonstrate to the approval authority that certain components or systems need not be monitored if, in the event of their total failure or removal, emissions do not exceed the applicable thresholds limits for OBD Stage 2 given in the table in Article 4(3) of this Direc- tive when measured over the cycles shown in section 1.1 of Appendix 1 to this Annex. This provision shall not apply to an exhaust gas recir- culation (EGR) device, a deNOx system, a particulate filter or a combined deNOx-particulate filter system.

             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 func- tional 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 tem- perature), boost pressure and inlet manifold pressure (and relevant sensors to enable these functions to be carried out), sensors and actuators of a deNOx 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.

             3.4.1.5. 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.

             3.5. OBD operation and temporary disablement of certain OBD monitoring capabilities

             3.5.1. The OBD system must be so designed, constructed and installed in a vehicle as to enable it to comply with the requirements of