Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p43
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 43/150)
Character Range: 834738–837622

are met:
(a) The failure results in an emission increase of any pollutant of less than 50 per cent of the regulated emission limit; and
(b) The failure does not cause any emission to exceed the regulated emission limit[33]; and
(c) The failure does not affect a component or system enabling the proper performance of the OBD system; and
(d) The failure does not substantially delay or affect the ability of the emission control system to operate as originally designed (for example a breakdown of the reagent heating system under cold conditions cannot be considered as an exception).
Determination of the emissions impact shall be performed on a stabilized engine system in an engine dynamometer test cell, according to the demonstration procedures of this annex.
When such a demonstration would not be conclusive regarding criterion (d), the manufacturer shall submit to the Type Approval Authority appropriate design elements such as good engineering practice, technical considerations, simulations, test results, etc.
4.2.3. Monitoring frequency
 Monitors shall run continuously, at any time where the monitoring conditions are fulfilled, or once per operating sequence (e.g. for monitors that lead to an increase of emission when it runs).
 At the request of the manufacturer, the Type Approval Authority may approve monitors that do not run continuously. In that case the manufacturer shall clearly inform the Type Approval Authority and describe the conditions under which the monitor runs and justify the proposal by appropriate design elements (such as good engineering practice).
 The monitors shall run during the applicable OBD test-cycle as specified in paragraph 7.2.2.
 A monitor shall be regarded as running continuously, if it runs at a rate not less than twice per second and concludes the presence or the absence of the failure relevant to that monitor within 15 seconds. If a computer input or output component is sampled less frequently than twice per second for engine control purpose, a monitor shall also be regarded as running continuously, if the system concludes the presence or the absence of the failure relevant to that monitor each time sampling occurs.
 For components or systems monitored continuously, it is not required to activate an output component/system for the sole purpose of monitoring that output component/system.
4.3. Requirements for recording OBD information
 When a malfunction has been detected but is not yet confirmed, the possible malfunction shall be considered as a "Potential DTC" and accordingly a "Pending DTC" status shall be recorded. A "Potential DTC" shall not lead to an activation of the alert system according to paragraph 4.6.
 Within the first operating sequence, a malfunction may be directly considered "confirmed and active" without having been considered a "potential DTC". It shall be given the "Pending DTC" and