Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p119
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 119/150)
Character Range: 1054446–1057329

a scan tool
A.2.2.2.1.1. Erasing of information, including DTCs relative to failures justifying the activation of a driver warning signal and of their associated data, by means of a scan tool shall be performed in accordance with Annex 9B.
A.2.2.2.1.2. The erasing of failure information shall only be possible under "engine-off" conditions.
A.2.2.2.1.3. When failure information, including DTCs, is erased, any counter associated with these failures and which is specified in this annex as one that must not be erased shall not be erased.
A.2.3.  Activation and deactivation mechanism of the driver inducement system
A.2.3.1. The driver inducement system shall be activated when the warning system is active and the counter relevant to the type of malfunction justifying its activation has reached the value specified in Table 2.
A.2.3.2. The driver inducement system shall be deactivated when the system no longer detects a malfunction justifying its activation, or if the information, including the DTCs, relative to the failures justifying its activation has been erased by a scan tool or maintenance tool.
A.2.3.3. The driver warning and inducement systems shall be immediately activated or deactivated as appropriate in accordance with the provisions of paragraph 6. of this annex after assessment of the reagent quantity in the reagent tank. In that case, the activation or deactivation mechanisms shall not depend upon the status of any associated DTC.
A.2.4.  Counter mechanism
A.2.4.1. General
A.2.4.1.1. To comply with the requirements of this annex, the system shall contain separate counters to record the number of hours during which the engine has been operated while the system has detected any of the following:
 (a) An incorrect reagent quality;
(b) An incorrect reagent consumption;
(c) An interruption of reagent dosing activity;
(d) An impeded EGR valve;
                  (e) A failure of the monitoring system as defined of paragraph 9.1. (b) of this annex.
A.2.4.1.2. Each of these counters shall count up to the maximum value provided in a 2 byte counter with 1 hour resolution, and shall hold that value unless the conditions allowing the counter to be reset to zero are met.
A.2.4.1.3. A manufacturer may use a single or multiple monitoring system counters.
A single counter may accumulate the number of hours of 2 or more different malfunctions relevant to that type of counter.
A.2.4.1.3.1. When the manufacturer decides to use multiple monitoring system counters, the system shall be capable of assigning a specific monitoring system counter to each malfunction that is relevant, in accordance with 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