Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p52
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 52/59)
Character Range: 750674–753739

tank, interruption of reagent dosing activity, insufficient reagent quality, too low reagent consumption, incorrect EGR flow or deactivation of the EGR. In all other cases, the manufacturer is permitted to refer to a non-erasable fault code "high NOx — root cause unknown".

              6.5.3.4.        If the NOx level exceeds the OBD threshold limit values given in the table in Article 4(3), a torque limiter shall reduce the performance of the engine according to the requirements of section 6.5.5 in a manner that is clearly perceived by the driver of the vehicle. When the torque limiter is activated the driver shall continue to be alerted according to the requirements of section 6.5.3.2 and a non-erasable fault code shall be stored in accordance with section 6.5.3.3.

              6.5.3.5.        In the case of engine systems that rely on the use of EGR and no other aftertreatment system for NOx emissions control, the manufacturer may utilise an alternative method to the requirements of section
              6.5.3.1 for the determination of the NOx level. At the time of type approval the manufacturer shall demonstrate that the alternative method is equally timely and accurate in determining the NOx level compared to the requirements of section 6.5.3.1 and that it triggers the same consequences as those referred to in sections 6.5.3.2, 6.5.3.3 and 6.5.3.4.

              6.5.4.            Reagent control

              6.5.4.1.        For vehicles that require the use of a reagent to fulfil the requirements of this section, the driver shall be informed of the level of reagent in the on-vehicle reagent storage tank through a specific mechanical or electronic indication on the vehicle's dashboard. This shall include a warning when the level of reagent goes:

                -           below 10 % of the tank or a higher percentage at the choice of the manufacturer, or

                -           below the level corresponding to the driving distance possible with the fuel reserve level specified by the manufacturer.

              The reagent indicator shall be placed in close proximity to the fuel level indicator.

              6.5.4.2.        The driver shall be informed, according to the requirements of section 3.6.5 of Annex IV to Directive 2005/78/EC, if the reagent tank becomes empty.

              6.5.4.3.        As soon as the reagent tank becomes empty, the requirements of section 6.5.5 shall apply in addition to the requirements of section 6.5.4.2.

              6.5.4.4.        A manufacturer may choose to comply with the sections 6.5.4.5 to 6.5.4.12 as an alternative to complying with the requirements of section 6.5.3.

              6.5.4.5.        Engine systems shall include a means of determining that a fluid corresponding to the reagent characteristics declared by the manufacturer and recorded in Annex II to this Directive is present on the vehicle.

              6.5.4.6.        If the fluid in the reagent tank does not correspond to the minimum requirements declared by the manufacturer as