Commission Directive 2005/78/EC (repealed)Show full title

6. OBD TEST CYCLE

6.1. The OBD test cycle is a single shortened ESC test cycle. The individual modes shall be performed in the same order as the ESC test cycle, as defined in section 2.7.1 of Appendix 1 to Annex III to Directive 2005/55/EC.

The engine must be operated for a maximum of 60 seconds in each mode, completing engine speed and load changes in the first 20 seconds. The specified speed shall be held to within ± 50 rpm and the specified torque shall be held to within ± 2 % of the maximum torque at each speed.

Exhaust emissions are not required to be measured during the OBD test cycle.

6.2. Preconditioning cycle

6.2.1. After introduction of one of the failure modes given in section 6.3, the engine and its OBD system shall be preconditioned by performing a preconditioning cycle.

6.2.2. At the request of the manufacturer and with the agreement of the type-approval authority, an alternative number of a maximum of nine consecutive OBD test cycles may be used.

6.3. OBD system test

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 deNO_x 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 deNO_x system (including any sensors that are an integral part of the system) with a deteriorated or defective deNO_x system or electronic simulation of a deteriorated or defective deNO_x system that results in emissions exceeding the OBD NO_x 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 deNO_x 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 deNO_x system

• any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a deNO_x 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 deNO_x 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 deNO_x-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 NO_x 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 deNO_x-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 deNO_x-particulate filter system

• any electrical failure of a component (e.g. sensors and actuators, dosing control unit) of a combined deNO_x-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 deNO_x-particulate filter system

• major breakdown of a NO_x 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.