Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p22
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 22/27)
Character Range: 698217–701089

other test cycle (hot WHTC or WHSC) shall be run at the beginning and end of the service accumulation schedule.
              3.3.2.2. During the service accumulation schedule, maintenance shall be carried out on the engine according to the requirements of paragraph 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 (hereinafter MI) being activated.
              3.3.2.4. The use of market fuels is allowed for conducting the service accumulation schedule. A reference fuel shall be used to carry out the emission test.
              3.4. Reporting
              3.4.1. The results of all emission tests (hot WHTC and WHSC) 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 hot WHTC and WHSC tests shall be carried out within the following 100 hours of service accumulation.
              3.4.2. The manufacturer shall retain records of all information concerning all the emission tests and maintenance carried out on the engine during the service accumulation schedule. This information shall be submitted to the Type 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 hot WHTC and WHSC tests at each test point during the service accumulation schedule, a "best fit" linear 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 paragraph 5.3. of this Regulation, plus one additional decimal place. In accordance with paragraph 3.2.1.4. of this annex, if it has been agreed that only one test cycle (hot WHTC or WHSC) be run at each test point and the other test cycle (hot WHTC or WHSC) run only at the beginning and at the end of the service accumulation schedule, the regression analysis shall be made only on the basis of the test results from the test cycle run at each test point.
               At the request of the manufacturer and with the prior approval of the Type Approval Authority a non linear regression shall be permitted.
              3.5.2. The emission values for each pollutant at the start of the service accumulation schedule and at the useful life end point that is applicable for the engine under test shall be calculated from the regression equation. If the