Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:7:p10
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 7 (pt 10/51)
Character Range: 560371–564055

monitoring systems is permitted provided disablement occurs only when the power take-off unit is active.
               In addition to the provisions of this section 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 it can  demonstrate that stabilisation of the fuelling system after re-fuelling or               fuel switching takes longer for justified technical reasons. In any case,               the OBD system shall be re-enabled as soon as either the fuel quality               and composition is recognised or the engine parameters are readjusted.
              3.2.2. Engine misfire in vehicles equipped with positive-ignition engines
              3.2.2.1. Manufacturers may adopt higher misfire percentage malfunction criteria than those declared to the authority, under specific engine speed and load conditions where it can be demonstrated to the authority that the detection of lower levels of misfire would be unreliable.
              3.2.2.2. When a manufacturer can demonstrate to the authority that the detection of higher levels of misfire percentages is still not feasible, or that misfire cannot be distinguished from other effects (e.g. rough roads, transmission shifts, after engine starting; etc.) the misfire monitoring system may be disabled when such conditions exist.
              3.3. Description of tests
              3.3.1. The test are carried out on the vehicle used for the Type V durability test, given in Annex 9, and using the test procedure in Appendix 1 to this annex. Tests are carried out at the conclusion of the Type V durability testing.
               When no Type V durability testing is carried out, or at the request of the manufacturer, a suitably aged and representative vehicle may be used for these OBD demonstration tests.
              3.3.2. The OBD system shall indicate the failure of an emission-related component or system when that failure results in emissions exceeding the threshold limits given below:

OBD threshold limits
          Reference mass    Mass of carbon monoxide  Mass of non-methane hydrocarbons  Mass of oxides of nitrogen  Mass of particulates
          (RW)
          (kg)
(CO)      (NMHC)            (NOx)                    (PM)
(mg/km)   (mg/km)           (mg/km)                  (mg/km)
Category  Class                                      PI                                CI                          PI                    CI   PI   CI   PI1  CI2
M         -                 All                      1900                              1900                        250                   320  300  540  50   50
N13       I                 RW ≤ 1305                1900                              1900                        250                   320  300  540  50   50
II        1305 < RW ≤ 1760  3400                     2400                              330                         360                   375  705  50   50
III       1760 < RW         4300                     2800                              400                         400                   410  840  50   50
N2        -                 All                      4300                              2800                        400                   400  410  840  50   50

       Key: PI = Positive Ignition, CI =