Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p57
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 57/150)
Character Range: 872182–875262

tampering while a vehicle is in-service.
 Manufacturers may apply to the Type Approval Authority for an exemption from one of these requirements for those vehicles that are unlikely to require protection. The criteria that the Type Approval Authority will evaluate in considering an exemption will include, but are not limited to, the current availability of performance chips, the high-performance capability of the vehicle and the projected sales volume of the vehicle.
 Manufacturers using programmable computer code systems (e.g. electrical erasable programmable read-only memory, EEPROM) shall deter unauthorized reprogramming. Manufacturers shall include enhanced tamper-protection strategies and write protect features requiring electronic access to an off-site computer maintained by the manufacturer. Alternative methods giving an equivalent level of tamper protection may be approved by the Type Approval Authority
4.9. Durability of the OBD system
 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 or engine system.
 Any additional provisions addressing the durability of OBD systems are contained in this annex.
 An OBD system shall not be programmed or otherwise designed to partially or totally deactivate based on age and/or mileage of the vehicle during the actual life of the vehicle, nor shall the system contain any algorithm or strategy designed to reduce the effectiveness of the OBD system over time.
5. Performance requirements
5.1. Thresholds
 The OTLs for the applicable monitoring criteria defined in Appendix 3 to this annex are defined in the main part of this Regulation
5.2. Temporary disablement of the OBD system
 Approval authorities may approve that an OBD system be temporarily disabled under the conditions specified in the following sub-paragraphs.
 At the time of type approval, the manufacturer shall provide the Type Approval Authority with the detailed description of each of the OBD system's temporary disablement strategies and the data and/or engineering evaluation demonstrating that monitoring during the applicable conditions would be unreliable or impractical.
 In all cases, monitoring shall resume once the conditions justifying temporary disablement are no longer present.
5.2.1. Engine/vehicle operational safety
 Manufacturers may request approval to disable the affected OBD monitoring systems when operational safety strategies are activated.
 The OBD monitoring system is not required to evaluate components during malfunction if such evaluation would result in a risk to the safe use of the vehicle.
5.2.2. Ambient temperature and altitude conditions
 Manufacturers may request approval to disable OBD system monitors:
                  (a) At ambient temperatures below 266 K (-7 degrees Celsius) in the case where the coolant temperature has not reached a minimum temperature of at least 333 K (60 degrees Celsius); or
                  (b) At ambient temperatures below 266K (-7 degrees Celsius) in the case of frozen reagent; or