6.3.1. Diesel engines and vehicles equipped with a diesel engine

6.3.1.1. After preconditioning according to section 6.2, the test engine is operated over the OBD test cycle described in section 6.1 of this Appendix. The MI must activate before the end of this test under any of the conditions given in 6.3.1.2 to 6.3.1.7. The technical service may substitute those conditions by others in accordance with section 6.3.1.7. For the purposes of type-approval, the total number of failures subject to testing, in the case of different systems or components, must not exceed four. If the test is being carried out to type-approve an OBD-engine family consisting of engines that do not belong to the same engine family, the type approval authority will increase the number of failures subject to testing up to a maximum of four times the number of engine families present in the OBD-engine family. The type-approval authority may decide to curtail the test at any time before this maximum number of failure tests has been reached. 6.3.1.2. Where fitted in a separate housing that may or may not be part of a deNOx system or diesel particulate filter, replacement of any catalyst with a deteriorated or defective catalyst or electronic simulation of such a failure. 6.3.1.3. Where fitted, replacement of a deNOx system (including any sensors that are an integral part of the system) with a deteriorated or defective deNOx system or electronic simulation of a deteriorated or defective deNOx system that results in emissions exceeding the OBD NOx threshold limit referred to in the table given in Article 4(3) of this Directive. In the case that the engine is being type-approved according to Article 4(1) of this Directive in relation to monitoring for major functional failure, the test of the deNOx system shall determine that the MI illuminates under any of the following conditions: complete removal of the system or replacement of the system by a bogus system lack of any required reagent for a deNOx system any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a deNOx system, including, when applicable, the reagent heating system failure of a reagent dosing system (e.g. missing air supply, clogged nozzle, dosing pump failure) of a deNOx system major breakdown of the system. 6.3.1.4. Where fitted, total removal of the particulate filter or replacement of the particulate filter with a defective particulate filter that results in emissions exceeding the OBD particulate threshold limit given in the table in Article 4(3) of this Directive. In the case that the engine is being type-approved according to Article 4(1) of this Directive in relation to monitoring for major functional failure, the test of the particulate filter shall determine that the MI illuminates under any of the following conditions: complete removal of the particulate filter or replacement of the system by a bogus system major melting of the particulate filter substrate major cracking of the particulate filter substrate any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a particulate filter failure, when applicable, of the reagent dosing system (e.g. clogged nozzle, dosing pump failure) of a particulate filter a clogged particulate filter resulting in a differential pressure out of the range declared by the manufacturer. 6.3.1.5. Where fitted, replacement of a combined deNOx-particulate filter system (including any sensors that are an integral part of the device) with a deteriorated or defective system or electronic simulation of a deteriorated or defective system that results in emissions exceeding the OBD NOx and particulate threshold limits given in the table in Article 4(3) of this Directive. In the case that the engine is being type-approved according to Article 4(1) of this Directive in relation to monitoring for major functional failure, the test of the combined deNOx-particulate filter system shall determine that the MI illuminates under any of the following conditions: complete removal of the system or replacement of the system by a bogus system lack of any required reagent for a combined deNOx-particulate filter system any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a combined deNOx-particulate filter system, including, when applicable, the reagent heating system failure of a reagent dosing system (e.g. missing air supply, clogged nozzle, dosing pump failure) of a combined deNOx-particulate filter system major breakdown of a NOx trap system major melting of the particulate filter substrate major cracking of the particulate filter substrate a clogged particulate filter resulting in a differential pressure out of the range declared by the manufacturer. 6.3.1.6. Disconnection of any fuelling system electronic fuel quantity and timing actuator that results in emissions exceeding any of the OBD thresholds referred to in the table given in Article 4(3) of this Directive. 6.3.1.7. Disconnection of any other emission-related engine component connected to a computer that results in emissions exceeding any of the thresholds referred to in the table given in Article 4(3) of this Directive. 6.3.1.8. In demonstrating compliance with the requirements of 6.3.1.6 and 6.3.1.7 and with the agreement of the approval authority, the manufacturer may take appropriate steps to demonstrate that the OBD system will indicate a fault when disconnection occurs.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.