Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p33
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 33/59)
Character Range: 696827–699869

Annex I to Directive 2005/55/EC.

             3.5. OBD operation and temporary disablement of certain OBD monitoring capabilities

             3.5.1. The OBD system must be so designed, constructed and installed in a vehicle as to enable it to comply with the requirements of this Annex during the conditions of use defined in section 6.1.5.4 of Annex I to Directive 2005/55/EC.

              Outside these normal operating conditions the emission control system may show some degradation in OBD system performance such that the thresholds given in the table in Article 4(3) of this Directive may be exceeded before the OBD system signals a failure to the driver of the vehicle.

              The OBD system must not be disabled unless one or more of the following conditions for disablement are met:

             3.5.1.1. The affected OBD monitoring systems may be disabled if its ability to monitor is affected by low fuel levels. For this reason, disablement is per- mitted when the fuel tank level falls below 20 % of the nominal capacity of the fuel tank.

             3.5.1.2. The affected OBD monitoring systems may be temporarily disabled during the operation of an auxiliary emission control strategy as described in section 6.1.5.1 of Annex I to Directive 2005/55/EC.

             3.5.1.3. The affected OBD monitoring systems may be temporarily disabled when operational safety or limp-home strategies are activated.

             3.5.1.4. For vehicles designed to accommodate the installation of power take-off units, disablement of affected OBD monitoring systems is permitted pro- vided disablement takes place only when the power take-off unit is active and the vehicle is not being driven.

             3.5.1.5. The affected OBD monitoring systems may be disabled temporarily during the periodic regeneration of an emission control system downstream of the engine (i.e. a particulate filter, deNOx system or combined deNOx-particulate filter).

             3.5.1.6. The affected OBD monitoring systems may be disabled temporarily outside the conditions of use defined in section 6.1.5.4 of Annex I to Direc- tive 2005/55/EC when this disablement can be justified by a limitation of the OBD monitoring (including modelling) capability.

             3.5.2. The OBD monitoring system is not required to evaluate components during malfunction if such evaluation would result in a risk to safety or com- ponent failure.

             3.6. Activation of malfunction indicator (MI)

             3.6.1. The OBD system must incorporate a malfunction indicator readily visible to the vehicle operator. Except in the case of section 3.6.2 of this Annex, the MI (e.g. symbol or lamp) must not be used for any purpose other than emission related malfunction except to indicate emergency start-up or limp-home routines to the driver. Safety related messages can be given the highest priority. The MI must be visible in all reasonable lighting con- ditions. When activated, it must display a symbol in conformity with ISO 2575 (1)