Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p43
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 43/59)
Character Range: 724309–727498

strategy is activated, if the engine cannot run any test, or in case of EGR sticking valves, etc). This exception shall be documented by the manufacturer. It is subject to the agreement of the technical service.

           2.                 DESCRIPTION OF TEST

             2.1. The testing of OBD systems consists of the following phases:

                -          simulating the malfunction of a component of the engine management or emission control system as described in section 1.1 of this Appendix

                -          preconditioning of the OBD system with a simulated malfunction over the preconditioning cycle specified in section 6.2

                -          operating the engine with a simulated malfunction over the OBD test cycle referred to in section 6.1

                -          determining whether the OBD system reacts to the simulated malfunction and indicates malfunction in an appropriate manner.

             2.1.1. Should the performance (e.g. power curve) of the engine be affected by the malfunction, the OBD test-cycle remains the shortened version of the ESC test-cycle used for the assessing the exhaust emissions of the engine without that malfunction.

             2.2. Alternatively, at the request of the manufacturer, malfunction of one or more components may be electronically simulated according to the requirements of section 6.

             2.3. Manufacturers may request that monitoring take place outside the OBD test cycle referred to in section 6.1 if it can be demonstrated to the authority that monitoring during conditions encountered during this OBD test cycle would impose restrictive monitoring conditions when the vehicle is used in service.

           3.                 TEST ENGINE AND FUEL

             3.1. Engine

              The test engine shall comply with the specifications laid down in Appendix 1 of Annex II to Directive 2005/55/EC.

             3.2. Fuel

              The appropriate reference fuel as described in Annex IV to Directive 2005/55/EC must be used for testing.

           4.                 TEST CONDITIONS

              The test conditions must satisfy the requirements of the emission test described in the present directive.

           5.                  TEST EQUIPMENT

              The engine dynamometer must meet the requirements of Annex III to Directive 2005/55/EC.

           6.                  OBD TEST CYCLE

             6.1. The OBD test cycle is a single shortened ESC test cycle. The individual modes shall be performed in the same order as the ESC test cycle, as defined in section 2.7.1 of Appendix 1 to Annex III to Directive 2005/55/EC.

              The engine must be operated for a maximum of 60 seconds in each mode, completing engine speed and load changes in the first 20 seconds. The specified speed shall be held to within ± 50 rpm and the specified torque shall be held to within ± 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