Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p90
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 90/150)
Character Range: 977673–980449

following information:
(a) The VIN (vehicle identification number);
(b) The numerator and denominator for each group of monitors recorded by the system according to paragraph 6.;
(c) The general denominator;
(d) The value of the ignition cycle counter;
(e) The total engine running hours;
(f) Confirmed and active DTCs for Class A malfunctions;
(g) Confirmed and active DTCs for Class B (B1 and B2) malfunctions.
 This information shall be available through "read‑only" access (i.e. no clearing).
7.2. Access to in-use performance data
 Access to in-use performance data shall be provided only in accordance with the standards mentioned in Appendix 6 to Annex 9B and the following sub-paragraphs[46].
 Access to the in-use performance data shall not be dependent on any access code or other device or method obtainable only from the manufacturer or its suppliers. Interpretation of the in-use performance data shall not require any unique decoding information, unless that information is publicly available.
 The access method (i.e. the access point/node) to in-use performance data shall be the same as the one used to retrieve all OBD information. This method shall permit access to the complete in-use performance data required by this annex.
7.3. Reinitialising in-use performance data
7.3.1. Reset to zero
 Each number shall be reset to zero only when a Non-Volatile Random Access Memory (NVRAM) reset occurs (e.g., reprogramming event). Numbers may not be reset to zero under any other circumstances including when a scan tool command to clear fault codes is received.
7.3.2. Reset in case of memory overflow
 If either the numerator or denominator for a specific monitor reaches 65,535 ± 2, both numbers shall be divided by two before either is incremented again to avoid overflow problems.
 If the ignition cycle counter reaches the maximum value of 65,535 ± 2, the ignition cycle counter may rollover and increment to zero on the next ignition cycle to avoid overflow problems.
 If the general denominator reaches the maximum value of 65,535 ± 2, the general denominator may rollover and increment to zero on the next driving cycle that meets the general denominator definition to avoid overflow problems.

Annex 9C ‑ Appendix 1 Groups of monitors
The groups of monitors considered in this annex are the following:
A. Oxidation catalysts
 The monitors specific to that group are those listed in item 5 of Appendix 3 to Annex 9B.
B. Selective Catalytical Reduction systems (SCR)
 The monitors specific to that group are those listed in item 3 of Appendix 3 to Annex 9B.
C. Exhaust gas and oxygen sensors
 The monitors specific to that group are those listed in item 13 of Appendix 3 to Annex 9B.
D. EGR systems and VVT
 The monitors specific to that group are those