Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p59
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 59/150)
Character Range: 877998–881034

malfunction at the voltage used to disable other monitors.
5.2.4.2. High voltage
 For emission related monitoring systems affected by high vehicle battery or system voltages, manufacturers may request approval to disable monitoring systems when the battery or system voltage exceeds a manufacturer-defined voltage.
 The manufacturer shall demonstrate that monitoring above the manufacturer-defined voltage would be unreliable and that either the electrical charging system/alternator warning light is illuminated (or voltage gauge is in the "red zone") or the OBD system monitors the battery or system voltage and will detect a malfunction at the voltage used to disable other monitors.
5.2.5. Active PTO (power take-off units)
 The manufacturer may request approval to temporarily disable affected monitoring systems in vehicles equipped with a PTO unit, under the condition where that PTO unit is temporarily active.
5.2.6. Forced regeneration
 The manufacturer may request approval to disable the affected OBD monitoring systems during the forced regeneration of an emission control system downstream of the engine (e.g. a particulate filter).
5.2.7. Auxillary Emissions Strategy (AES)
 The manufacturer may request approval to disable OBD system monitors during the operation of an AES, including MECS, under conditions not already covered in paragraph 5.2. if the monitoring capability of a monitor is affected by the operation of an AES.
5.2.8. Re-fuelling
 After a refuelling, the manufacturer of a gaseous-fuelled vehicle may temporarily disable the OBD system when the system has to adapt to the recognition by the ECU of a change in the fuel quality and composition.
 The OBD system shall be re-enabled as soon as the new fuel is recognized and the engine parameters are readjusted. This disablement shall be limited to a maximum of 10 minutes.
6. Demonstration requirements
 The basic elements for demonstrating the compliance of an OBD system with the requirements of this annex are as follows:
(a) Procedure for selecting the OBD-parent engine system. The OBD-parent engine system is selected by the manufacturer in agreement with the Type Approval Authority;
(b) Procedure for demonstrating the classification of a malfunction. The manufacturer submits to the Type Approval Authority the classification of each malfunction for that OBD-parent engine system and the necessary supporting data in order to justify each classification;
(c) Procedure for qualifying a deteriorated component. The manufacturer shall provide, on request of the Type Approval Authority, deteriorated components for OBD testing purposes. These components are qualified on the basis of supporting data provided by the manufacturer;
(d) Procedure for selecting the reference fuel in case of a gas engine.
6.1. Emission-OBD family
 The manufacturer is responsible for determining the composition of an emission-OBD family. Grouping engine systems within an emission-OBD family shall be based on good engineering judgement and be subject to approval by