Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:7:p12
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 7 (pt 12/51)
Character Range: 566677–569912

be monitored for circuit continuity.
              3.3.3.7. For direct injection positive ignition engines any malfunction, which may lead to emissions exceeding the particulate threshold limits provided for by paragraph 3.3.2. of this annex and which has to be monitored according to the requirements of this annex for compression ignition engines, shall be monitored.
              3.3.4. Monitoring requirements for vehicles equipped with compression-ignition engines
               In satisfying the requirements of paragraph 3.3.2. the OBD system shall monitor:
              3.3.4.1. Where fitted, reduction in the efficiency of the catalytic converter;
              3.3.4.2. Where fitted, the functionality and integrity of the particulate trap;
              3.3.4.3. The fuel-injection system electronic fuel quantity and timing actuator(s) is/are monitored for circuit continuity and total functional failure;
              3.3.4.4. Other emission control system components or systems, or emission-related power-train components or systems, which are connected to a computer, the failure of which may result in exhaust emissions exceeding the limits given in paragraph 3.3.2. Examples of such systems or components are those for monitoring and control of air mass-flow, air volumetric flow (and temperature), boost pressure and inlet manifold pressure (and relevant sensors to enable these functions to be carried out).
              3.3.4.5. Unless otherwise monitored, any other emission-related power-train component connected to a computer shall be monitored for circuit continuity.
              3.3.4.6. Malfunctions and the reduction in efficiency of the EGR system shall be monitored.
              3.3.4.7. Malfunctions and the reduction in efficiency of a NOx after-treatment system using a reagent and the reagent dosing sub-system shall be monitored.
              3.3.4.8. Malfunctions and the reduction in efficiency of NOx after-treatment not using a reagent shall be monitored.
              3.3.5. Manufacturers may demonstrate to the approval authority that certain components or systems need not be monitored if, in the event of their total failure or removal, emissions do not exceed the emission limits given in paragraph 3.3.2.
              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 I 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 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 telltales (e. g. brake system, fasten seat belt, oil pressure, etc.) are permitted. The use of red colour for