Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p47
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 47/150)
Character Range: 845440–848324

of a confirmed and active DTC associated with a Class B malfunction.
 Whenever a B1 counter reaches 200 hours, the OBD system shall command a continuous-MI.
4.6.3.1.3. Class C malfunctions
 The manufacturer may make available information on Class C malfunctions through the use of an on-demand-MI that shall be available until the engine is started.
4.6.3.1.4. MI de-activation scheme
 The "continuous-MI" shall switch to a "short-MI" if a single monitoring event occurs and the malfunction that originally activated the continuous-MI is not detected during the current operating sequence and a continuous-MI is not activated due to another malfunction.
 The "short-MI" shall be deactivated if the malfunction is not detected during the 3 subsequent sequential operating sequences following the operating sequence when the monitor has concluded the absence of the considered malfunction and the MI is not activated due to another Class A or B malfunction.
Figures 1, 4A and 4B in Appendix 2 to this annex illustrate respectively the short and continuous MI deactivation in different use-cases.
              4.6.4. MI activation at key-on/engine-off

               The MI activation at key-on/engine-off shall consist of two sequences separated by a 5 seconds MI off:

                  (a) The first sequence is designed to provide an indication of the MI functionality and the readiness of the monitored components;

                  (b) The second sequence is designed to provide an indication of the presence of a malfunction.

               The first sequence starts from the first time the system is at key-on position and stops either at its normal completion or when the key is set to the key-off position, whichever occurs first.

               The second sequence is repeated until either the engine is started1[34], the vehicle starts moving, or the key is set to the key-off position, whichever occurs first.

4.6.4.1. MI functionality/readiness
 The MI shall show a steady indication for 5 seconds to indicate that the MI is functional.
 The MI shall remain at the off position for 10 seconds.
 The MI shall then remain at the on position for 5 seconds to indicate that the readiness for all monitored components is complete.
 The MI shall blink once per second for 5 seconds to indicate that the readiness for one or more of the monitored components is not complete.
 The MI shall then remain off for 5 seconds.
4.6.4.2. Presence / absence of a malfunction
 Following the sequence described in paragraph 4.6.4.1, the MI shall indicate the presence of a malfunction by a series of flashes or a continuous illumination, depending on the applicable activation mode, as described in the following paragraphs; or the absence of a malfunction by a series of single flashes. When applicable, each flash consists of a 1s MI-on followed by a one second MI-off, and the series