Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:13:p2
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 13 (pt 2/23)
Character Range: 1947147–1950132

be equipped with an OBD system so designed, constructed and installed in a vehicle as to enable it to identify types of deterioration or malfunction over the entire life of the vehicle. In achieving this objective, the Type Approval Authority shall accept that vehicles which have travelled distances in excess of the target useful life (according to paragraph 6.7. of this Regulation) referred to in paragraph 3.3.1. of this annex, may show some deterioration in OBD system performance such that the OBD thresholds set out in Table 4A and Table 4B (as applicable) in paragraph 6.8.2. of this Regulation may be exceeded before the OBD system signals a failure to the driver of the vehicle.

              3.1.1. Access to the OBD system required for the inspection, diagnosis, servicing or repair of the vehicle shall be unrestricted and standardised. All emission-related fault codes shall be consistent with paragraph 6.5.3.5. of Appendix 1 to this annex.

              3.2. The OBD system shall be so designed, constructed and installed in a vehicle as to enable it to comply with the requirements of this annex during conditions of normal use.

              3.2.1. Temporary disablement of the OBD system

              3.2.1.1. A manufacturer may disable the OBD system if its ability to monitor is affected by low fuel levels. Disablement shall not occur when the fuel tank level is above 20 per cent of the nominal capacity of the fuel tank.

              3.2.1.2. A manufacturer may disable any specific OBD monitor for a given driving cycle for ambient or engine temperatures below 266 K (-7 °C) or at elevations over 2,440 metres above sea level provided the manufacturer submits data and/or an engineering evaluation which adequately demonstrate that monitoring would be unreliable when such conditions exist. A manufacturer may also request disablement of any specific OBD monitor at other ambient temperatures or other elevations if they demonstrate to the authority with data and/or an engineering evaluation that misdiagnosis would occur under such conditions. It is not necessary to illuminate the Malfunction Indicator (MI) if OBD thresholds are exceeded during a regeneration provided no defect is present.

              3.2.1.3. For vehicles designed to accommodate the installation of power take-off units, disablement of affected monitoring systems is permitted provided disablement occurs only when the power take-off unit is active.

               In addition to the provisions of this paragraph the manufacturer may temporarily disable the OBD system in the following conditions:

                  (a) For flex fuel or mono/bi fuel gas vehicles during 1 minute after re-fuelling to allow for the recognition of fuel quality and composition by the ECU;

                  (b) For bi fuel vehicles during 5 seconds after fuel switching to allow for readjusting engine parameters;

                  (c) The manufacturer may deviate from these time limits if