Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p41
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 41/150)
Character Range: 829250–832174

set in Appendix 3 and, in the case of dual-fuel engines or vehicles in section 7. of Annex 15. However, the OBD system is not required to use a unique monitor to detect each malfunction referred to in Appendix 3 and, in the case of dual-fuel engines or vehicles in section 7. of Annex 15.
 The OBD system shall also monitor its own components.
 The items of Appendix 3 to this annex list the systems or components required to be monitored by the OBD system and describes the types of monitoring expected for each of these components or systems (i.e. emission threshold monitoring, performance monitoring, total functional failure monitoring, or component monitoring).
 The manufacturer can decide to monitor additional systems and components.
4.2.1. Selection of the monitoring technique
Approval authorities may approve a manufacturer's use of another type of monitoring technique than the one mentioned in Appendix 3 or, in the case of dual-fuel engines or vehicles in section 7. of Annex 15. The chosen type of monitoring shall be shown by the manufacturer, to be robust, timely and efficient (i.e. through technical considerations, test results, previous agreements, etc.).
In case a system and/or component is not covered by Appendix 3 or, in the case of dual-fuel engines or vehicles in section 7. of Annex 15, the manufacturer shall submit for approval to the Type Approval Authority an approach to monitoring. The Type Approval Authority will approve the chosen type of monitoring and monitoring technique (i.e. emission threshold monitoring, performance monitoring, total functional failure monitoring, or component monitoring) if it has been shown by the manufacturer by reference to those detailed in Appendix 3 or, in the case of dual- fuel engines or vehicles in section 7. of Annex 15, to be robust, timely and efficient (i.e. through either technical considerations, test results, previous agreements, etc.).
       4.2.1.1. Correlation to actual emissions
In the case of emission threshold monitoring, a correlation to test-cycle specific emissions shall be required. This correlation would typically be demonstrated on a test engine in a laboratory setting.
In all other monitoring cases (i.e. performance monitoring, total functional failure monitoring, or component monitoring), no correlation to actual emissions is necessary. However, the Type Approval Authority may request test data to verify the classification of the malfunction effects as described in paragraph 6.2. of this annex.
Examples:
An electrical malfunction may not require a correlation because this is a yes/no malfunction. A DPF malfunction monitored via delta pressure may not require a correlation because it anticipates a malfunction.
If the manufacturer demonstrates, according to the demonstration requirements of this annex, that emissions would not exceed the OBD threshold limits upon total failure or removal of a component or