Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p44
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 44/59)
Character Range: 727229–730183

± 2 % of the maximum torque at each speed.

              Exhaust emissions are not required to be measured during the OBD test cycle.

             6.2. Preconditioning cycle

             6.2.1. After introduction of one of the failure modes given in section 6.3, the engine and its OBD system shall be pre- conditioned by performing a preconditioning cycle.

             6.2.2. At the request of the manufacturer and with the agreement of the type-approval authority, an alternative number of a maximum of nine consecutive OBD test cycles may be used.

             6.3. OBD system test

             6.3.1. Diesel engines and vehicles equipped with a diesel engine

             6.3.1.1. After preconditioning according to section 6.2, the test engine is operated over the OBD test cycle described in section 6.1 of this Appendix. The MI must activate before the end of this test under any of the conditions given in 6.3.1.2 to 6.3.1.7. The technical service may substitute those conditions by others in accordance with sec- tion 6.3.1.7. For the purposes of type-approval, the total number of failures subject to testing, in the case of dif- ferent systems or components, must not exceed four.

              If the test is being carried out to type-approve an OBD-engine family consisting of engines that do not belong to the same engine family, the type approval authority will increase the number of failures subject to testing up to a maximum of four times the number of engine families present in the OBD-engine family. The type-approval authority may decide to curtail the test at any time before this maximum number of failure tests has been reached.

             6.3.1.2. Where fitted in a separate housing that may or may not be part of a deNOx system or diesel particulate filter, replacement of any catalyst with a deteriorated or defective catalyst or electronic simulation of such a failure.

             6.3.1.3. Where fitted, replacement of a deNOx system (including any sensors that are an integral part of the system) with a deteriorated or defective deNOx system or electronic simulation of a deteriorated or defective deNOx system that results in emissions exceeding the OBD NOx threshold limit referred to in the table given in Article 4(3) of this Directive.

              In the case that the engine is being type-approved according to Article 4(1) of this Directive in relation to moni- toring for major functional failure, the test of the deNOx system shall determine that the MI illuminates under any of the following conditions:

                -          complete removal of the system or replacement of the system by a bogus system

                -          lack of any required reagent for a deNOx system

                -          any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a deNOx system, including, when applicable, the reagent heating system

                -