Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p38
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 38/150)
Character Range: 821334–824119

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 been selected from an emission-OBD family for which most of its OBD elements of design are representative of that family.
3.16. "On-demand-MI" means the malfunction indicator showing a steady indication in response to a manual demand from the driving position when the key is in the on (run) position with the engine off (ignition on - engine off).
3.17. "Pending DTC" means a DTC that is stored by the OBD system because a monitor has detected a situation where a malfunction may be present during the current or last completed operating sequence.
3.18. "Potential DTC" means a DTC that is stored by the OBD system because a monitor has detected a situation where a malfunction may be present but requires further evaluation to be confirmed. A potential DTC is a pending DTC which is not a confirmed and active DTC.
3.19. "Previously active DTC" means a formerly confirmed and active DTC that remains stored after the OBD system has concluded that the malfunction that caused the DTC is no longer present.
3.20. "Rationality failure" means a malfunction where the signal from an individual sensor or component is at variance with that expected when assessed against signals available from other sensors or components within the control system. Rationality failures include malfunctions that lead to the measured signals (i.e. voltages, currents, frequencies, etc.) being inside the range where the transfer functions of the sensor is designed to operate.
3.21. "Readiness" means a status indicating whether a monitor or a group of monitors have run since the last erasing by an external request or command (for example through an OBD scan-tool).
              3.22. "Short-MI" means the malfunction indicator showing a 15 seconds 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, and extinguishing either after these 15 seconds or when the key is moved to off, whichever occurs first."

3.23. "Software calibration identification" means a series of alphanumeric characters that identifies the emission-related calibration / software version(s) installed in the engine system.
3.24. "Total functional failure monitoring" means monitoring a malfunction which is leading to a complete loss of the desired function of a system.
3.25. "Warm-up cycle" means sufficient engine operation such that the coolant temperature has risen by at least 22 K (22 °C / 40 °F) from engine starting and reaches a minimum temperature of 333 K (60 °C / 140 °F)[32].