Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p16
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 16/59)
Character Range: 647834–650843

the operation of the engine-after-treatment system has stabilised. If requested by the approval authority the manufacturer shall make available the data and analy- sis used to make this determination. As an alternative, the manufacturer may elect to run the engine for 125 hours to stabilise the engine- aftertreatment system.

             3.3.1.2. The stabilisation period determined in section 3.3.1.1 will be deemed to be the start of the service accumulation schedule.

             3.3.2. Service accumulation testing

             3.3.2.1. After stabilisation, the engine will be run over the service accumulation schedule selected by the manufacturer, as described in section 3.2 above. At the periodic intervals in the service accumulation schedule determined by the manufacturer, and, where appropriate, also stipulated by the type-approval authority according to section 3.2.2, the engine shall be tested for gaseous and particulate emissions over the ESC and ETC tests. In accordance with section 3.2, if it has been agreed that only one test cycle (ESC or ETC) be run at each test point, the other test cycle (ESC or ETC) must be run at the beginning and end of the service accumulation schedule.

             3.3.2.2. During the service accumulation schedule, maintenance will be carried out on the engine according to section 4.

             3.3.2.3. During the service accumulation schedule, unscheduled maintenance on the engine or vehicle may be performed, for example if the OBD system has specifically detected a problem that has resulted in the malfunction indicator (MI) being activated.

             3.4. Reporting

             3.4.1. The results of all emission tests (ESC and ETC) conducted during the service accumulation schedule shall be made available to the type-approval authority. If any emission test is declared to be void, the manufacturer shall provide an explanation of why the test has been declared void. In such a case, another series of emission tests over the ESC and ETC tests shall be carried out within a further 100 hours of service accumulation.

             3.4.2. Whenever a manufacturer tests an engine over a service accumulation schedule for the establishment of deterioration factors, the manufacturer shall retain in its records all information concerning all the emission tests and maintenance carried out on the engine during the service accu- mulation schedule. This information shall be submitted to the approval authority along with the results of the emission tests conducted over the service accumulation schedule.

             3.5. Determination of deterioration factors

             3.5.1. For each pollutant measured on the ESC and ETC tests and at each test point during the service accumulation schedule, a "best fit" regression analysis shall be made on the basis of all test results. The results of each test for each pollutant shall be expressed to the same number of decimal places as the limit value for that pollutant, as shown in