Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p89
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 89/150)
Character Range: 975010–977933

command).
5.6.4. In the case of a malfunction (i.e. a potential or confirmed and active DTC has been stored) preventing determination of whether the criteria for the General denominator mentioned in paragraph 5.4. are satisfied, the OBD system shall disable further incrementing the general denominator within 10 seconds.
 Incrementing the general denominator shall resume within 10 seconds when the malfunction is no longer present (e.g., pending code erased through self-clearing or by a scan tool command).
 The general denominator may not be disabled from incrementing for any other condition.
6.  Requirements for tracking and recording in-use performance data
 For each group of monitors listed in Appendix 1 to this annex, the OBD system shall separately track numerators and denominators for each of the specific monitors listed in Appendix 3 to Annex 9B and belonging to that group.
 It shall report only the corresponding numerator and denominator for the specific monitor that has the lowest numerical ratio.
 If two or more specific monitors have identical ratios, the corresponding numerator and denominator for the specific monitor that has the highest denominator shall be reported for the specific group of monitors.
 In order to determine without bias the lowest ratio of a group, only the monitors specifically mentioned in that group shall be taken into consideration (e.g. a NOx sensor when used to perform one of the monitors listed in Annex 9B, Appendix 3, item 3 "SCR" will be taken into consideration into the "exhaust gas sensor" group of monitors and not in the "SCR" group of monitors)
 The OBD system shall also track and report the general denominator and the ignition cycle counter.
 Note: According to paragraph 4.1.1., manufacturers are not required to implement software algorithms in the OBD system to individually track and report numerators and denominators of monitors running continuously.
7.  Requirements for storing and communicating in-use performance data
 Communication of the in-use performance data is a new use-case and is not included in the three existing use-cases which are dedicated to the presence of possible malfunctions
7.1. Information about in-use performance data
 The information about in-use performance data recorded by the OBD system shall be available upon off-board request according to paragraph 7.2.
 This information will provide type approval authorities with in-use performance data.
 The OBD system shall provide all information (according to the applicable standard set in Appendix 6 to Annex 9B) for the external IUPR test equipment to assimilate the data and provide an inspector with the following information:
(a) The VIN (vehicle identification number);
(b) The numerator and denominator for each group of monitors recorded by the system according to paragraph 6.;
(c) The general denominator;
(d) The value of the ignition cycle counter;
(e) The