Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:13:p18
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 13 (pt 18/23)
Character Range: 1993623–1996797

provisions of paragraph 6.5.3.3. of this appendix.
              6.5.3.6.  The connection interface between the vehicle and the diagnostic tester shall be standardised and shall meet all the requirements of the standard listed in paragraph 6.5.3.2.(c) of this appendix. The installation position shall be subject to agreement of the administrative department such that it is readily accessible by service personnel but protected from tampering by non-qualified personnel.

              7. In-use performance

               This paragraph is only applicable for Level 1A

              7.1. General requirements

              7.1.1. Each monitor of the OBD system shall be executed at least once per driving cycle in which the monitoring conditions as specified in paragraph 7.2. of this appendix are met. Manufacturers may not use the calculated ratio (or any element thereof) or any other indication of monitor frequency as a monitoring condition for any monitor.

              7.1.2. The In-Use Performance Ratio (IUPR) of a specific monitor M of the OBD systems and in-use performance of pollution control devices shall be:

               IUPRM = NumeratorM / DenominatorM

              7.1.3. Comparison of numerator and denominator gives an indication of how often a specific monitor is operating relative to vehicle operation. To ensure all manufacturers are tracking IUPRM in the same manner, detailed requirements are given for defining and incrementing these counters.

              7.1.4. If, according to the requirements of this annex, the vehicle is equipped with a specific monitor M, IUPRM shall be greater or equal to the following minimum values:

                  (a) 0.260 for secondary air system monitors and other cold start related monitors;

                  (b) 0.520 for evaporative emission purge control monitors;

                  (c) 0.336 for all other monitors.

              7.1.5. Vehicles shall comply with the requirements of paragraph 7.1.4. of this appendix for a mileage of at least the target useful life, as defined in paragraph 6.7. of this Regulation.

              7.1.6. The requirements of this paragraph are deemed to be met for a particular monitor M, if for all vehicles of a particular OBD family manufactured in a particular calendar year the following statistical conditions hold:

                  (a) The average IUPRM is equal or above the minimum value applicable to the monitor;

                  (b) More than 50 per cent of all vehicles have an IUPRM equal or above the minimum value applicable to the monitor.

              7.2. NumeratorM

              7.2.1. The numerator of a specific monitor is a counter measuring the number of times a vehicle has been operated such that all monitoring conditions necessary for the specific monitor to detect a malfunction in order to warn the driver, as they have been implemented by the manufacturer, have been encountered. The numerator shall not be incremented more than once per driving cycle, unless there is reasoned technical justification.

              7.3. DenominatorM

              7.3.1. The purpose of the denominator is to provide a counter