Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p86
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 86/150)
Character Range: 967115–970073

minimum value of zero and a maximum value of 7.99527 with a resolution of 0.000122[44].
 A ratio for a specific component shall be considered to be zero whenever the corresponding numerator is equal to zero and the corresponding denominator is not zero.
 A ratio for a specific component shall be considered to be the maximum value of 7.99527 if the corresponding denominator is zero or if the actual value of the numerator divided by the denominator exceeds the maximum value of 7.99527.
5.2. Requirements for incrementing the numerator
 The numerator shall not be incremented more than once per driving cycle.
 The numerator for a specific monitor shall be incremented within 10 seconds if and only if the following criteria are satisfied on a single driving cycle:
(a) Every monitoring condition necessary for the monitor of the specific component to detect a malfunction and store a potential DTC has been satisfied, including enable criteria, presence or absence of related DTCs, sufficient length of monitoring time, and diagnostic executive priority assignments (e.g., diagnostic "A" shall execute prior to diagnostic "B").
 Note: For the purpose of incrementing the numerator of a specific monitor, it may not be sufficient to satisfy all the monitoring conditions necessary for that monitor to determine the absence of a malfunction.
(b) For monitors that require multiple stages or events in a single driving cycle to detect a malfunction, every monitoring condition necessary for all events to have been completed shall be satisfied.
(c) For monitors which are used for failure identification and that run only after a potential DTC has been stored, the numerator and denominator may be the same as those of the monitor detecting the original malfunction.
(d) For monitors that require an intrusive operation to further investigate the presence of a malfunction, the manufacturer may submit to the Type Approval Authority an alternative way to increment the numerator. This alternative should be equivalent to that which would, had a malfunction been present, have permitted to increment the numerator.
 For monitors that run or complete during engine-off operation, the numerator shall be incremented within 10 seconds after the monitor has completed during engine-off operation or during the first 10 seconds of engine start on the subsequent driving cycle.
       5.3.  Requirements for incrementing the denominator
5.3.1. General incrementing rules
 The denominator shall be incremented once per driving cycle, if during this driving cycle:
(a) The general denominator is incremented as specified in paragraph 5.4.; and
(b) The denominator is not disabled according to paragraph 5.6.; and
(c) When applicable, the specific additional incrementing rules specified in paragraph 5.3.2. are met.
5.3.2. Additional monitor specific incrementing rules
5.3.2.1. Specific denominator for evaporative system (reserved)
5.3.2.2. Specific denominator for