Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:13:p6
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 13 (pt 6/23)
Character Range: 1959107–1962098

need not be monitored if, in the event of their total failure or removal, emissions do not exceed the OBD thresholds set out in paragraph 6.8.2. of this Regulation.

              3.3.5.1. For Level 1A only

              The following devices should however be monitored for total failure or removal (if removal would cause the applicable emission limits in paragraph 6.3.10. of this Regulation to be exceeded):

                  (a) A particulate trap fitted to compression ignition engines as a separate unit or integrated into a combined emission control device;

                  (b) A NOx after treatment system fitted to compression ignition engines as a separate unit or integrated into a combined emission control device;

                  (c) A Diesel Oxidation Catalyst (DOC) fitted to compression ignition engines as a separate unit or integrated into a combined emission control device.

              3.3.5.2. For Level 1A only

              The devices referred to in paragraph 3.3.5.1. of this annex shall also be monitored for any failure that would result in exceeding the applicable OBD thresholds set out in in paragraph 6.8.2. of this Regulation.

              3.4.  A sequence of diagnostic checks shall be initiated at each engine start and completed at least once provided that the correct test conditions are met. The test conditions shall be selected in such a way that they all occur under normal driving as represented by the Type 1 test.

              3.5. Activation of malfunction indicator (MI)

              3.5.1. The OBD system shall incorporate a malfunction indicator readily perceivable to the vehicle operator. The MI shall not be used for any other purpose except to indicate emergency start-up, emission default modes or limp-home routines to the driver. The MI shall be visible in all reasonable lighting conditions. When activated, it shall display a symbol in conformity with ISO 2575. A vehicle shall not be equipped with more than one general purpose MI for emission-related problems. Separate specific purpose tell tales (e. g. brake system, fasten seat belt, oil pressure, etc.) are permitted. The use of red colour for an MI is prohibited.

              3.5.2. For strategies requiring more than two preconditioning cycles for MI activation, the manufacturer shall provide data and/or an engineering evaluation which adequately demonstrates that the monitoring system is equally effective and timely in detecting component deterioration. Strategies requiring on average more than ten driving cycles for MI activation are not accepted. The MI shall also activate whenever the engine control enters a permanent emission default mode of operation if any of the OBD thresholds set out in paragraph 6.8.2. of this Regulation are exceeded or if the OBD system is unable to fulfil the basic monitoring requirements specified in paragraph 3.3.3. or 3.3.4. of this annex. The MI shall operate in a distinct warning mode, e.g. a flashing light,