Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p39
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 39/150)
Character Range: 823901–826827

3.25. "Warm-up cycle" means sufficient engine operation such that the coolant temperature has risen by at least 22 K (22 °C / 40 °F) from engine starting and reaches a minimum temperature of 333 K (60 °C / 140 °F)[32].
3.26. Abbreviations
 AES Auxiliary Emission Strategy
CV Crankcase Ventilation
 DOC Diesel Oxidation Catalyst
                  DPF Diesel Particulate Filter or Particulate Trap including catalyzed DPFs and Continuously Regenerating Traps (CRT)
 DTC Diagnostic trouble code
 EGR Exhaust Gas Recirculation
 HC Hydrocarbon
 LNT Lean NOx Trap (or NOx absorber)
 LPG Liquefied Petroleum Gas
 MECS Malfunction Emission Control Strategy
 NG Natural Gas
 NOx Oxides of Nitrogen
 OTL OBD Threshold Limit
 PM Particulate Matter
 SCR Selective Catalytic Reduction
 SW Screen Wipers
 TFF Total Functional Failure monitoring
 VGT Variable Geometry Turbocharger
 VVT Variable Valve Timing
4. General requirements
 In the context of this annex, the OBD system shall have the capability of detecting malfunctions, of indicating their occurrence by means of a malfunction indicator, of identifying the likely area of the malfunctions by means of information stored in computer memory, and communicating that information off-board.
 The OBD system shall be designed and constructed so as to enable it to identify types of malfunctions over the complete life of the vehicle/engine. In achieving this objective, the Type Approval Authority will recognize that engines which have been used in excess of their regulatory useful life may show some deterioration in OBD system performance and sensitivity such that the OBD thresholds may be exceeded before the OBD system signals a malfunction to the driver of the vehicle.
 The above paragraph does not extend the engine manufacturer's compliance liability for an engine beyond its regulated useful life (i.e. the time or distance period during which emission standards or emission limits continue to apply).
4.1. Application for approval of an OBD system
4.1.1. Primary approval
 The manufacturer of an engine system may apply for the approval of its OBD system in one of the three following manners:
(a) The manufacturer of an engine system applies for the approval of an individual OBD system by demonstrating that OBD system complies with all the provisions of this annex;
(b) The manufacturer of an engine system applies for the approval of an emission-OBD family by demonstrating that the OBD-parent engine system of the family complies with all the provisions of this annex.
 The manufacturer of an engine system applies for the approval of an OBD system by demonstrating that OBD system meets the criteria for belonging to an emission-OBD family that has already been certified.
4.1.2. Extension / Modification of an existing certificate
4.1.2.1. Extension to include a new engine system into an emission-OBD family
 At the request of the manufacturer and upon approval of