Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p37
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 37/150)
Character Range: 818511–821573

This annex is based on the world-wide harmonized OBD global technical regulation (gtr) No. 5.
2. Reserved[31]
3. Definitions
3.1. "Alert system" means a system on-board the vehicle which informs the driver of the vehicle or any other interested party that the OBD system has detected a malfunction.
3.2. "Calibration verification number" means the number that is calculated and reported by the engine system to validate the calibration/software integrity.
3.3. "Component monitoring" means the monitoring of input components for electrical circuit failures and rationality failures and monitoring of output components for electrical circuit failures and functionality failures. It refers to components that are electrically connected to the controller(s) of the engine system.
3.4. "Confirmed and active DTC" means a DTC that is stored during the time the OBD system concludes that a malfunction exists.
3.5. "Continuous-MI" means the malfunction indicator showing a steady indication from the time the key is moved to on (run) position and the engine is started (ignition on – engine on) or the vehicle starts moving, whichever occurs first, and extinguishing when the key is moved to off.
3.6. "Deficiency" means an OBD monitoring strategy or other OBD feature that does not meet all the detailed requirements of this annex.
3.7. "Electrical circuit failure" means a malfunction (e.g. open circuit or short circuit) that leads to the measured signal (i.e. voltages, currents, frequencies, etc.) being outside the range where the transfer functions of the sensor is designed to operate.
3.8. "Emission OBD family" means a manufacturer's grouping of engine systems having common methods of monitoring/diagnosing emission-related malfunctions.
3.9. "Emission threshold monitoring" means monitoring of a malfunction that leads to an excess of the OBD threshold limits (OTLs) and which consists of either or both of the following:
                  (a) Direct emissions measurement via a tailpipe emissions sensor(s) and a model to correlate the direct emissions to specific emissions of the applicable test-cycle;

                  (b) Indication of an emissions increase via correlation of computer input and output information to test-cycle specific emissions.

3.10. "Functionality failure" means a malfunction where an output component does not respond to a computer command in the expected way.
3.11. "Malfunction emission control strategy (MECS)" means a strategy within the engine system that is activated as a result of an emission-related malfunction.
3.12. "MI status" means the command status of the MI, being either continuous-MI, Short-MI, on-demand-MI, or off.
3.13. "Monitoring" (see "emission threshold monitoring", "performance monitoring", and "total functional failure monitoring")
3.14. "OBD test-cycle" means the cycle over which an engine system is operated on an engine test-bed to evaluate the response of an OBD system to the presence of a qualified deteriorated component.
3.15. "OBD-parent engine system" means an engine system that has