Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p76
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 76/150)
Character Range: 926344–929814

Misfire that may cause catalyst damage (e.g. by monitoring a certain percentage of misfiring in a certain period of time) – performance monitoring.          X

       Appendix 3 - Item 11
       Crankcase Ventilation System Monitoring
       No prescriptions.
       Appendix 3 - Item 12
       Engine Cooling System Monitoring
       The OBD system shall monitor the following elements of the engine cooling system for proper operation:
           (a) Engine coolant temperature (thermostat): Stuck open thermostat. Manufacturers need not monitor the thermostat if its failure will not disable any other OBD monitors - total functional failure.
       Manufacturers need not monitor the engine coolant temperature or the engine coolant temperature sensor if the engine coolant temperature or the engine coolant temperature sensor is not used to enable closed-loop/feedback control of any emissions control systems and/or will not disable any other monitor.
       Manufacturers may suspend or delay the monitor for the time to reach close loop to enable temperature if the engine is subjected to conditions that could lead to false diagnosis (e.g. vehicle operation at idle for more than 50 to 75 per cent of the warm-up time).
       Appendix 3 - Item 13
       Exhaust gas and oxygen sensors monitoring
       The OBD system shall monitor:
                                                                                                                                                                                                                             Diesel  Gas
    (a) The electrical elements of the exhaust gas sensors on engines so-equipped for proper operation according to item 1 to this appendix – component monitoring.                                                          X       X
    (b) Both the primary and secondary (fuel control) oxygen sensors. These sensors are considered as exhaust gas sensors to be monitored for proper operation according to item 1 to this appendix – component monitoring.          X

       Appendix 3 - Item 14
       Idle speed control system monitoring
       The OBD system shall monitor the electrical elements of the idle speed control systems on engines so-equipped for proper operation according to item 1 to this appendix.
       Appendix 3 – Item 15
       Three-way catalyst
       The OBD system shall monitor the three-way catalyst on engines so-equipped for proper operation:
                                                                                                                        Diesel  Gas
    (a) Three-way Catalyst Conversion efficiency: the catalyst ability to convert NOx and CO – performance monitoring.          X

Annex 9B ‑ Appendix 4 Technical compliance report
       This report is issued by the Type Approval Authority, according to paragraphs 6.3.3. and 7.3. of this annex, after examination of an OBD system or an emission OBD family when that system or family complies with the requirements of this appendix.
       The exact reference (including its version number) of this appendix shall be included in this report.
       The exact reference (including its version number) to this Regulation shall be included.
       This report contains a cover page indicating the final compliance of the OBD system or emission OBD family and the following 5 items:
        Item 1 Information concerning the OBD system
        Item 2 Information concerning the conformity