Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p61
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 61/150)
Character Range: 883582–886539

families considered within the emission OBD family. The Type Approval Authority may decide to curtail the test at any time before this maximum number of failure tests has been reached.
 In specific cases where the classification testing is not possible (for example, if an MECS is activated and the engine cannot run the applicable test, etc.), the malfunction may be classified based on technical justification. This exception shall be documented by the manufacturer and is subject to the agreement of the Type Approval Authority.
6.2.1. Demonstration of classification into Class A
 The classification by the manufacturer of a malfunction into Class A shall not be subject to a demonstration test.
 If the Type Approval Authority disagrees with a manufacturer's classification of a malfunction as Class A, the Type Approval Authority requires the classification of the malfunction into Class B1, B2 or C, as appropriate.
 In that case the approval document shall record that the malfunction classification has been assigned according to the request of the Type Approval Authority.
6.2.2. Demonstration of classification into Class B1 (distinguishing between A and B1)
 In order to justify the classification of a malfunction into Class B1 the documentation shall clearly demonstrate that, in some circumstances[40], the malfunction results in emissions that are lower than the OTLs.
 In the case that the Type Approval Authority requires an emission test for demonstrating the classification of a malfunction into Class B1 the manufacturer shall demonstrate that the emissions due to that particular malfunction are, in selected circumstances, below the OTLs:
(a) The manufacturer selects the circumstances of the test in agreement with the Type Approval Authority;
(b) The manufacturer shall not be required to demonstrate that in other circumstances the emissions due to the malfunction are actually above the OTLs.
 If the manufacturer fails to demonstrate the classification as Class B1, the malfunction is classified as Class A.
       6.2.3. Demonstration of classification into Class B1 (distinguishing between B2 and  B1)
 If the Type Approval Authority disagrees with a manufacturer's classification of a malfunction as Class B1 because it considers that the OTLs are not exceeded, the Type Approval Authority requires the reclassification of that malfunction into Class B2 or C. In that case the approval documents shall record that the malfunction classification has been assigned according to the request of the Type Approval Authority.
6.2.4. Demonstration of classification into Class B2 (distinguishing between B2 and B1)
 In order to justify the classification of a malfunction into Class B2 the manufacturer shall demonstrate that emissions are lower than the OTLs.
 In case the Type Approval Authority disagrees with the classification of a malfunction as Class B2 because it considers that the OTLs are exceeded, the manufacturer may be