Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p120
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 120/150)
Character Range: 1057075–1060447

this annex, to that type of counter.
A.2.4.2. Principle of counter mechanisms
A.2.4.2.1. Each of the counters shall operate as follows:
A.2.4.2.1.1. If starting from zero, the counter shall begin counting as soon as a malfunction relevant to that counter is detected and the corresponding diagnostic trouble code (DTC) has the status described in Table 1.
A.2.4.2.1.2. The counter shall halt and hold its current value if a single monitoring event occurs and the malfunction that originally activated the counter is no longer detected or if the failure has been erased by a scan tool or a maintenance tool.
A.2.4.2.1.2.1. If the counter stops counting when the severe inducement system is active, the counter shall be kept frozen at the value defined in Table 2.
A.2.4.2.1.2.2. In the case of a single monitoring system counter, that counter shall continue counting if a malfunction relevant to that counter has been detected and its corresponding Diagnostic trouble code (DTC) has the status "confirmed and active". It shall halt and hold the value specified in paragraph A.2.4.2.1.2., or A.2.4.2.1.2.1. as appropriate, if no malfunction that would justify the counter activation is detected or if all the failures relevant to that counter have been erased by a scan tool or a maintenance tool.
       Table 2
       Counters and inducement
                                                                                                                      Counter value for
                             DTC status for first activation of the counter   Counter value for low-level inducement  severe inducement   Frozen value held by the counter during the period just after severe inducement
Reagent quality counter      Confirmed and active                             10 hours                                20 hours            18 hours
Reagent consumption counter  Potential or confirmed and active                10 hours                                20 hours            18 hours
                             (see Table 1)
Dosing counter               Confirmed and active                             10 hours                                20 hours            18 hours
EGR valve counter            Confirmed and active                             36 hours                                100 hours           95 hours
Monitoring system counter    Confirmed and active                             36 hours                                100 hours           95 hours

A.2.4.2.1.3. Once frozen, the counter shall be reset to zero when the monitors relevant to that counter have run at least once to completion of their monitoring cycle without having detected a malfunction and no malfunction relevant to that counter has been detected during 36 engine operating hours since the counter was last held (see Figure 1).
A.2.4.2.1.4. The counter shall continue counting from the point at which it had been held if a malfunction relevant to that counter is detected during a period when the counter is frozen (see Figure 1).
       Figure 1
       Reactivation and resetting to zero of a counter after a period when its value has been frozen
A.2.5.  Illustration of the activation and deactivation and counter mechanisms
A.2.5.1. This paragraph illustrates the activation and deactivation and counter mechanisms for some typical cases. The figures and descriptions given